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📘 Detailed Notes – Top 10 DGMS Circulars on HEMM (Opencast Mines)

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1. DGMS (Tech)(SOMA) Circular No. 03 of 2024 – Safety in Opencast Coal Mines (HEMM)

• Background: Issued due to frequent dumper & excavator accidents in OC mines.
• Key Provisions:
  • Structural Safety: All dumpers must have ROPS & FOPS.
  • Cabin Safety: Seat belts with audio-visual reminder, ergonomic driver’s cabin.
  • Haul Roads: Gradient ≤ 1:16, width = 2 dumper widths + 1.5 m berm each side.
  • Berms: Height ≥ ½ tyre diameter of the largest dumper.
  • Traffic Rules: One-way haul roads, designated parking areas, speed limits.
• Manager’s Responsibility: Prepare Traffic Management Plan (TMP) and conduct operator training.
• Exam Focus: “Design haul road for 100T dumper,” “Minimum berm height.”

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2. DGMS (Tech) Circular No. 6 of 2020 – HEMM & Heavy/Light Vehicles in Opencast Mines

• Background: Accidents due to mixed movement of heavy dumpers and light vehicles.
• Key Provisions:
  • Separate routes and parking areas for HEMM and light vehicles.
  • Daily pre-start checks: brakes, steering, horn, AV alarms.
  • Maintenance Logbook: To be signed by engineer/supervisor.
  • No unauthorized vehicle entry inside mine.
• Manager’s Responsibility: Certification of roadworthiness and scheduling of maintenance.
• Exam Focus: “Logbook entries,” “Pre-start check items.”

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3. DGMS (Tech) Circular No. 8 of 2003 – Proper Layout of Workshops in OC Mines

• Background: Accidents in workshops where HEMM and light vehicles moved together.
• Key Provisions:
  • Separate lanes for HEMM vs. light vehicles.
  • Dedicated brake-testing track with gradient.
  • Fuel storage & repair bays segregated.
  • Canteen/rest shelters away from traffic paths.
• Manager’s Responsibility: Ensure workshop drawings are approved and facilities marked.
• Exam Focus: “Brake-testing area requirement,” “Why separate parking?”

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4. DGMS (Tech) Circular 9 of 2008 – Haul Road & Bench Dimensions

• Background: Large dumpers (85T, 100T+) were introduced in OC mines, leading to road failures.
• Key Provisions:
  • Road width = 3 × dumper width + 5 m margin.
  • Gradient ≤ 1:16.
  • Turning radius: ≥ 3 × vehicle length.
  • Parapet walls/berms: ≥ ½ dumper tyre height.
  • Benches: ≤ 10–15 m height with catch berms.
• Manager’s Responsibility: Prepare haul road design chart with dimensions displayed at pit.
• Exam Focus: Numerical problems — “calculate road width.”

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5. DGMS (Tech) Circular No. 4 of 2013 – Fire Suppression in HEMM

• Background: Several dumper fires caused fatalities.
• Key Provisions:
  • Automatic Fire Detection & Suppression Systems (AFDS) compulsory in dumpers, dozers, excavators.
  • At least 2 fire extinguishers in operator cabin.
  • Workshop safety: hydrants, sand buckets, and fire exit routes.
• Manager’s Responsibility: Ensure AFDS is tested and certified annually.
• Exam Focus: Direct MCQ — “Which HEMM needs AFDS?”

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6. DGMS Circular (2011) – Simulator Training for HEMM Operators

• Background: High accident rate due to inexperienced operators.
• Key Provisions:
  • Simulator training mandatory before independent operation.
  • Refresher every 3 years.
  • Modules: reversing, fatigue awareness, emergency braking, night driving.
• Manager’s Responsibility: Maintain operator training register.
• Exam Focus: “Role of simulator training in accident reduction.”

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7. DGMS Directive (2015) – Safety Features on Mobile Equipment

• Background: Fatalities from reversing dumpers.
• Key Provisions:
  • AV alarms (audio-visual) for reversing.
  • Mirrors, rear-view cameras, proximity detection.
  • Seat belts with reminder alarm.
  • ROPS/FOPS reinforced for operator protection.
• Manager’s Responsibility: Ensure all dumpers retrofitted with alarms and cameras.
• Exam Focus: Short note — “Mandatory safety features on dumpers.”

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8. DGMS Circulars (2015) – Fatigue Management & Safety Systems (HSEMS)

• Background: Studies showed operator fatigue → 40% of dumper accidents.
• Key Provisions:
  • Health & Safety Management Systems (HSEMS) mandatory.
  • Fatigue monitoring (smart cards, cameras).
  • Job rotation to prevent >8 hr continuous HEMM driving.
  • Periodic medical checks.
• Manager’s Responsibility: Maintain fatigue logs and ensure rest schedules.
• Exam Focus: Essay — “How fatigue contributes to HEMM accidents?”

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9. DGMS Circular (2012) – Braking Systems in HEMM

• Background: Accidents due to brake failures on slopes.
• Key Provisions:
  • Daily brake testing at pit-top gradient track.
  • Dual braking systems recommended.
  • Emergency brake indicators in cabins.
  • Maintenance records kept in brake logbook.
• Manager’s Responsibility: Ensure defective vehicles are not deployed.
• Exam Focus: “What is dual braking system?”

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10. DGMS Circular (2010) – AV Alarms for Surface HEMM

• Background: Workers crushed due to silent reversing dumpers.
• Key Provisions:
  • AV alarms must be 5–10 dB louder than ambient noise.
  • Regular checks to ensure alarms functional.
  • Operators trained to stop immediately if alarm fails.
• Manager’s Responsibility: Daily inspection of AV alarms by supervisors.
• Exam Focus: “Decibel level requirement for AV alarms.”

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📊 Summary Snapshot

Year / Circular	Key Focus	Technical Highlights
2024 (SOMA-03)	HEMM safety & traffic norms	1:16 gradient, berm ½ tyre height
2020 (C-6)	HEMM + Light Vehicles	Separate routes, pre-start checks
2003 (C-8)	Workshop Layout	Brake test track, safe parking
2008 (C-9)	Haul Roads	Width = 3× dumper width + 5m
2013 (C-4)	Fire Suppression	AFDS mandatory, hydrants
2011	Simulator Training	Pre-job + refresher modules
2015 (Directive)	Safety Features	AV alarms, ROPS/FOPS, seat belts
2015 (HSEMS)	Fatigue Safety	Monitoring devices, job rotation
2012	Braking Systems	Dual brakes, gradient test
2010	AV Alarms	5–10 dB louder than ambient

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100-MCQ set from the 10 Important DGMS Circulars on HEMM, I’ll structure it in a booklet style:

• 10 questions per circular × 10 circulars = 100 questions
• Each with 5 options, correct answer ✅, and explanation 📝
• Mix of conceptual, numerical, and case-study based MCQs (just like DGMS exams).

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📘 100 MCQs on DGMS Circulars for HEMM

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🔹 Circular 1 – DGMS (Tech)(SOMA) Circular No. 03 of 2024 – Safety in Opencast Coal Mines (HEMM) 

  Q1. 🚜 The main purpose of Circular 03 of 2024 is:
A. Increase production targets
B. Ensure HEMM safety & traffic management
C. Improve blasting standards
D. Enhance illumination norms
E. Reduce PME frequency
✅ Answer: B
📝 Ensures safe operation of dumpers, dozers, excavators with structural & traffic rules. Q2. 📏 Maximum gradient of a permanent haul road in OC mines as per circular =
A. 1:10
B. 1:12
C. 1:14
D. 1:16
E. 1:20
✅ Answer: D
📝 Standard gradient = 1:16 for HEMM haul roads.

  Q3. 🛑 Minimum berm height along haul roads =
A. ¼ tyre height
B. ½ tyre height
C. ¾ tyre height
D. Full tyre height
E. Fixed 2 m
✅ Answer: B
📝 Berm ≥ ½ tyre height of largest dumper. 

  Q4. 🚦 Width of haul road for two-way traffic must be:
A. Equal to 1 dumper width
B. 2 dumper widths
C. 2 dumper widths + 1.5 m berm each side
D. Fixed 15 m
E. Equal to 3 dumper widths
✅ Answer: C
📝 Formula ensures safe crossing of vehicles. Q5. 🪖 Which structural feature protects operators from falling rock?
A. Seat belt
B. ROPS
C. FOPS
D. AV Alarm
E. Gradient control
✅ Answer: C
📝 FOPS = Falling Object Protective Structure. Q6. 🚧 Traffic Management Plan (TMP) is prepared by:
A. Safety Officer
B. Blaster
C. Mine Manager
D. DGMS
E. Dumper Operator
✅ Answer: C
📝 Manager is responsible for TMP implementation. 

  Q7. ⚡ Seat belts in HEMM must include:
A. Rope locking system
B. Colour warning
C. Audio-visual alarm
D. GPS tracking
E. None
✅ Answer: C
📝 AV reminder ensures seat belt use. 

  Q8. 📊 Circular 03 of 2024 emphasizes:
A. Cost reduction
B. Production increase
C. Safety of heavy machinery operation
D. Faster blasting cycles
E. Higher mine depth
✅ Answer: C
📝 Entire circular focuses on HEMM safety. 

  Q9. 🏗️ Berms along haul roads also act as:
A. Drainage channel
B. Visual safety guide
C. Fuel storage
D. Workshop boundary
E. None
✅ Answer: B
📝 Berms prevent fall & guide drivers.

  Q10. 📑 Which circular first mandated ROPS & FOPS in HEMM?
A. 2010 AV Alarm
B. 2012 Brake safety
C. 2013 Fire suppression
D. 2024 Circular 03 (SOMA)
E. 2003 Workshop safety
✅ Answer: D
📝 ROPS & FOPS clearly mandated in 2024 Circular.

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🔹 Circular 2 – DGMS (Tech) Circular No. 6 of 2020 – HEMM & Heavy/Light Vehicles in OC Mines 

  Q11. 🚗 The main purpose of Circular 6 of 2020 is:
A. Workshop safety
B. Regulating heavy & light vehicle movement in OC mines
C. Increasing blasting safety
D. Reducing dust emissions
E. Improving PME rules
✅ Answer: B
📝 Focus = Prevent accidents from HEMM-light vehicle interaction. 

  Q12. 🛻 Which vehicles must have separate parking & pathways?
A. Only HEMM
B. Only light vehicles
C. Both HEMM & light vehicles
D. Only contractors’ vehicles
E. None
✅ Answer: C
📝 Circular separates HEMM & LV routes. 

  Q13. 📝 Vehicle fitness certification is issued:
A. Monthly by driver
B. Quarterly by DGMS
C. Daily by supervisor after pre-start checks
D. Yearly by RTO
E. None
✅ Answer: C
📝 Daily checks = brakes, steering, horn, AV alarms.

  Q14. 🔍 Pre-start inspection of HEMM includes:
A. Horn & lights
B. Brakes & steering
C. AV alarms
D. All of the above
E. None
✅ Answer: D
📝 All must be checked before duty. 

  Q15. 📖 Vehicle logbooks are maintained to:
A. Record fuel use
B. Record operator attendance
C. Record maintenance & safety checks
D. Record blasting cycles
E. None
✅ Answer: C
📝 Ensures systematic safety compliance.

  Q16. 🚫 Unauthorized vehicle entry inside mine premises is:
A. Allowed with driver ID
B. Strictly prohibited
C. Allowed with manager’s verbal permission
D. Allowed for visitors
E. None
✅ Answer: B
📝 Only authorized vehicles may enter. 

  Q17. 👷 Who certifies vehicle roadworthiness daily?
A. DGMS
B. Operator
C. Supervisor/Engineer
D. Safety Officer
E. Contractor
✅ Answer: C
📝 Supervisor certifies after pre-start check. Q18. 🔧 Vehicle maintenance under Circular 6 of 2020 must be:
A. Reactive only
B. Preventive & recorded
C. Done once yearly
D. Done when DGMS inspects
E. None
✅ Answer: B
📝 Preventive maintenance + logbook records mandatory. 

  Q19. 🚨 AV alarms in light vehicles are:
A. Optional
B. Not needed
C. Mandatory
D. Allowed only in dumpers
E. None
✅ Answer: C
📝 All vehicles must have AV alarms. 

  Q20. 📢 Why was Circular 6 of 2020 issued?
A. Rising fire incidents
B. Dust complaints
C. Frequent collisions between HEMM & light vehicles
D. Noise pollution
E. Brake failures
✅ Answer: C
📝 Many accidents due to LV-HEMM collisions led to this circular.

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• Circular 3 – DGMS (Tech) Circular No. 8 of 2003 (Workshop Layout for HEMM in OC Mines)
• Circular 4 – DGMS (Tech) Circular No. 9 of 2008 (Haul Road & Bench Dimensions for HEMM)

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📘 100 MCQs on DGMS Circulars for HEMM (Set 2 – Q21 to Q40)

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🔹 Circular 3 – DGMS (Tech) Circular No. 8 of 2003 – Workshop Layout Safety 

  Q21. 🏭 The purpose of Circular 8 of 2003 is:
A. Improve blasting layout
B. Provide safe workshop design for HEMM
C. Reduce noise pollution
D. Improve slope monitoring
E. Train workers in gas testing
✅ Answer: B
📝 Circular ensures OC workshops are safe for HEMM movement & maintenance. 

  Q22. 🚦 Workshops must provide:
A. Separate lanes for HEMM & light vehicles
B. Shared traffic routes
C. Parking inside repair bay only
D. Parking in blasting zones
E. None
✅ Answer: A
📝 To prevent collisions between heavy & light vehicles. 

  Q23. 🛻 Brake-testing areas must be:
A. On public roads
B. On level ground only
C. Specially designed gradient track
D. At blasting face
E. At pit-top only
✅ Answer: C
📝 Brake tests must be done on dedicated gradient tracks.

  Q24. 🛑 Fuel storage in workshops must be:
A. Inside canteen
B. Inside rest shelter
C. In separate secured areas
D. Anywhere near machinery
E. None
✅ Answer: C
📝 Fuel storage must be segregated for fire safety. 

  Q25. 🧯 Which facility is NOT a part of safe workshop design?
A. Separate fuel bay
B. Brake-testing track
C. Canteen/rest shelter in traffic route
D. Dedicated parking zones
E. Clear markings for vehicle movement
✅ Answer: C
📝 Canteens/rest shelters should be away from traffic paths. 

  Q26. 📏 Layout drawings of workshops must be:
A. Prepared by contractor
B. Approved by Manager only
C. Approved by DGMS/competent authority
D. Not required
E. Optional
✅ Answer: C
📝 Layout plans must be approved to ensure compliance.

  Q27. 🔧 Major hazard in workshops is:
A. Blasting fumes
B. Slope failures
C. Collision of HEMM & light vehicles
D. Dust inhalation
E. None
✅ Answer: C
📝 Collisions were main cause behind this circular. 

  Q28. 🚗 Employee facilities like canteens must be located:
A. Inside the main traffic path
B. Adjacent to brake-testing tracks
C. Away from vehicle movement areas
D. Near fuel storage
E. None
✅ Answer: C
📝 Must be away from HEMM traffic flow. 

  Q29. 📝 Workshop circular requires:
A. Accident register only
B. Maintenance register
C. Brake-test records
D. Both B & C
E. None
✅ Answer: D
📝 Both maintenance & brake-test records must be maintained. 

  Q30. ⚠️ The 2003 circular was issued mainly due to:
A. Fire incidents in coal faces
B. Inundation in workshops
C. Fatal accidents inside mine workshops
D. Electrical short circuits
E. Lightning accidents
✅ Answer: C
📝 Issued after accidents involving unsafe workshop layouts.

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🔹 Circular 4 – DGMS (Tech) Circular No. 9 of 2008 – Haul Road & Bench Dimensions Q31. 🚜 Main purpose of Circular 9 of 2008 is:
A. To regulate blasting standards
B. To fix haul road & bench dimensions for HEMM
C. To train managers
D. To reduce PME frequency
E. To prevent gas emissions
✅ Answer: B
📝 Defines safe haul road & bench geometry for HEMM. 

  Q32. 📏 Minimum width of two-way haul road =
A. Equal to 1 dumper width
B. Equal to 2 dumper widths
C. 3 × dumper width + 5 m margin
D. Fixed 15 m
E. None
✅ Answer: C
📝 Standard formula ensures safe crossing. Q33. ⛰️ Maximum gradient of haul roads:
A. 1:10
B. 1:12
C. 1:14
D. 1:16
E. 1:18
✅ Answer: D
📝 Gradient not steeper than 1:16. 

  Q34. 🔄 Turning radius of haul road =
A. Equal to dumper width
B. Equal to vehicle length
C. ≥ 3 × vehicle length
D. Fixed 20 m
E. None
✅ Answer: C
📝 Ensures dumpers can safely turn. 

  Q35. 🚧 Minimum berm height along haul road =
A. ¼ tyre height
B. ½ tyre height
C. ¾ tyre height
D. Full tyre height
E. 2 m
✅ Answer: B
📝 Berm ≥ half tyre height of largest dumper. Q36. 🪨 Maximum bench height in OC mines as per circular =
A. 5 m
B. 7 m
C. 10–15 m depending on strata
D. 20 m
E. 25 m
✅ Answer: C
📝 Bench height ≤ 10–15 m, based on rock strength. Q37. 🧱 Catch berms are provided to:
A. Reduce illumination
B. Prevent vehicle movement
C. Catch falling rock material
D. Store explosives
E. Stop blasting fumes
✅ Answer: C
📝 Prevent accidents from rolling material. 

  Q38. 📊 Display of haul road design parameters must be at:
A. Manager’s office only
B. Workshop
C. Pit-top & mine entrance
D. Blasting area
E. None
✅ Answer: C
📝 For awareness of all drivers/operators. 

  Q39. ⚠️ The 2008 circular was mainly issued due to:
A. Lightning incidents
B. Frequent dumper accidents on unsafe roads
C. Blasting flyrock incidents
D. Heat stress injuries
E. Flooding
✅ Answer: B
📝 Unsafe haul roads caused multiple dumper accidents. 

  Q40. 📝 Bench height & road gradient are determined by:
A. Blaster
B. Mechanical engineer
C. Geotechnical study
D. DGMS inspector only
E. None
✅ Answer: C
📝 Based on rock mechanics & geotechnical recommendations.

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• Circular 5 – DGMS (Tech) Circular No. 4 of 2013 (Fire Suppression in HEMM)
• Circular 6 – DGMS Circular 2011 (Simulator-Based Training for HEMM Operators)

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📘 100 MCQs on DGMS Circulars for HEMM (Set 3 – Q41 to Q60)

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🔹 Circular 5 – DGMS (Tech) Circular No. 4 of 2013 – Fire Suppression in HEMM Q41. 🔥 The main objective of Circular 4 of 2013 is:
A. Improve slope stability
B. Prevent fires in HEMM & workshops
C. Enhance blasting safety
D. Reduce dust levels
E. Increase production efficiency
✅ Answer: B
📝 Focuses on mandatory fire suppression systems in heavy machinery & workshops. 

  Q42. 🧯 Fire suppression systems in HEMM must be:
A. Optional
B. Automatic or manually operated
C. Automatic only
D. Manual only
E. Not required in small machines
✅ Answer: B
📝 Circular allows automatic or manually triggered suppression systems. 

  Q43. 🚜 Which HEMM requires fire suppression systems?
A. Only dumpers above 100T
B. Only draglines
C. All heavy earth moving machinery
D. Only excavators
E. Only surface miners
✅ Answer: C
📝 Applicable to all HEMM units, irrespective of size. 

  Q44. 🛠️ Workshop fire safety includes:
A. Separate fuel storage
B. Fire extinguishers at key points
C. Automatic detection system
D. Trained firefighting staff
E. All of the above
✅ Answer: E
📝 Workshops must follow comprehensive fire safety measures. 

  Q45. ⚠️ Which is NOT a cause of fire in HEMM?
A. Hydraulic oil leakage
B. Electrical short circuit
C. Overheating of components
D. Poor seat belt use
E. Fuel spillage
✅ Answer: D
📝 Seat belt use has no link to fire. 

  Q46. 📝 Fire incidents in HEMM must be reported:
A. Within 7 days
B. Within 24 hours
C. Immediately to DGMS
D. Monthly
E. Annually
✅ Answer: C
📝 Immediate reporting is mandatory. 

  Q47. 🔍 Fire suppression system checks should be conducted:
A. Daily
B. Weekly
C. Monthly
D. Annually
E. Once in machine lifetime
✅ Answer: B
📝 Weekly testing ensures system functionality. Q48. 🚨 Emergency exit provision in HEMM cabins is:
A. Optional
B. Mandatory
C. Not applicable
D. Only in draglines
E. None
✅ Answer: B
📝 Circular mandates emergency exits for operator safety. 

  Q49. 📊 What additional system is recommended along with suppression systems?
A. AV alarms
B. Heat/smoke detection system
C. Dust filters
D. GPS
E. Tyre pressure monitor
✅ Answer: B
📝 Fire detection (heat/smoke) is key to early prevention. 

  Q50. 🧑‍🚒 Firefighting training is compulsory for:
A. Operators only
B. Mechanics only
C. All mine employees
D. Office staff only
E. None
✅ Answer: C
📝 All workers must receive basic firefighting training.

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🔹 Circular 6 – DGMS Circular 2011 – Simulator Training for HEMM Operators

Q51. 🎮 The 2011 circular introduced:
A. Gas testing
B. Simulator-based training for HEMM operators
C. PME rules
D. New blasting standards
E. Fire prevention rules
✅ Answer: B
📝 Simulator training improves operator skills & safety awareness.

  Q52. 🛠️ Which skill is improved by simulator training?
A. Slope stability analysis
B. Fuel efficiency & safe handling of HEMM
C. Medical check-ups
D. Dust sampling
E. Fire suppression
✅ Answer: B
📝 Operators learn fuel efficiency + safe operation practices. 

  Q53. 🚜 Simulator training is especially useful for:
A. New operators
B. Experienced operators
C. Contractors
D. Managers
E. Blasters
✅ Answer: A
📝 Fresh operators benefit the most before handling real HEMM. 

  Q54. 📝 Training record of operators must be:
A. Verbal only
B. Maintained in a logbook
C. Sent to DGMS yearly
D. Not required
E. Optional
✅ Answer: B
📝 Training logs ensure accountability. 

  Q55. ⚠️ Lack of operator training mainly leads to:
A. Dust generation
B. Dumper accidents
C. Blasting delay
D. Noise exposure
E. None
✅ Answer: B
📝 Most dumper/HEMM accidents linked to operator error. 

  Q56. 🎯 Which aspect is tested during simulator training?
A. Steering & braking response
B. Dumping & loading cycle
C. Fuel usage optimization
D. Emergency handling
E. All of the above
✅ Answer: E
📝 Simulators test multiple operational scenarios. 

  Q57. 🧑‍💼 Who is responsible for implementing simulator training?
A. Safety Officer
B. Blaster
C. Manager
D. DGMS Inspector
E. Dumper Operator
✅ Answer: C
📝 Mine Manager must ensure all operators undergo training. 

  Q58. 📊 Training syllabus for simulator use must be:
A. Prepared by local contractor
B. Approved by DGMS
C. Decided by operators
D. Verbal training only
E. None
✅ Answer: B
📝 DGMS approves training curriculum. 

  Q59. 🚧 Simulator training helps reduce:
A. Equipment downtime
B. Accidents & unsafe operations
C. Fuel wastage
D. All of the above
E. None
✅ Answer: D
📝 Simulator-based learning has multiple benefits. 

  Q60. 🛑 What was the main reason for issuing this circular?
A. Frequent dumper collisions due to untrained operators
B. Excessive blasting accidents
C. Fire incidents
D. Lightning hazards
E. Dust exposure
✅ Answer: A
📝 Most HEMM accidents were traced to inexperienced operators.

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• Circular 7 – DGMS Directive (2015) – Safety Features on Mobile Equipment (HEMM)
• Circular 8 – DGMS Circulars (2015) – Fatigue & Safety Management in HEMM

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📘 100 MCQs on DGMS Circulars for HEMM (Set 4 – Q61 to Q80)

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🔹 Circular 7 – DGMS Directive (2015) – Safety Features on Mobile Equipment 

  Q61. 🚜 The 2015 directive mandated installation of:
A. GPS only
B. Audio-visual (AV) reversing alarms
C. Fire suppression systems only
D. Seat belt reminder only
E. None
✅ Answer: B
📝 AV alarms alert nearby workers during reversing. 

  Q62. 📢 AV alarms must be:
A. Louder than ambient noise by 5–10%
B. Same as ambient noise
C. Quieter than ambient noise
D. Audible only in cabins
E. Not mandatory
✅ Answer: A
📝 Standard requires alarm sound above ambient noise. 

  Q63. 🪖 The directive also highlighted:
A. Compulsory use of PPE
B. Optional PPE use
C. PPE for visitors only
D. No PPE needed inside cabins
E. PPE not linked to HEMM
✅ Answer: A
📝 PPE (helmets, high-vis jackets, safety shoes) is mandatory near HEMM. 

  Q64. 🛑 Which feature is NOT covered under this directive?
A. AV alarms
B. Seat belts
C. Turbo charger guards
D. Excavation permit
E. Fire-resistant hoses
✅ Answer: D
📝 Excavation permit is unrelated to HEMM safety features. 

  Q65. 🔄 Seat belts in HEMM:
A. Optional for skilled operators
B. Mandatory for all operators
C. Mandatory for dumpers only
D. Optional in draglines
E. Not required if ROPS present
✅ Answer: B
📝 All operators must wear seat belts. 

  Q66. 🔧 Which inspection is compulsory before starting HEMM?
A. Fuel check only
B. Visual inspection of brakes, tyres, alarms, seat belt
C. DGMS inspection every day
D. Only by contractor
E. None
✅ Answer: B
📝 Pre-start checks reduce accidents. 

  Q67. 👷 Safety helmet & high-visibility jacket are required for:
A. Only supervisors
B. Operators & ground staff
C. Only mechanics
D. Managers
E. Not required in opencast
✅ Answer: B
📝 Operators + ground staff must wear them. Q68. ⚠️ The 2015 directive was issued due to:
A. Lightning accidents
B. High number of run-over/backing accidents
C. Inundation cases
D. Dust exposure
E. Noise complaints
✅ Answer: B
📝 Run-over accidents from reversing HEMM were major cause. 

  Q69. 🚧 HEMM parking areas must be:
A. Inside workshop only
B. Clearly demarcated & away from traffic routes
C. In blasting zone
D. Near explosives magazine
E. Anywhere convenient
✅ Answer: B
📝 Dedicated safe parking prevents collisions. Q70. 🔊 The AV alarm must activate:
A. During machine reversing
B. During engine start
C. During blasting
D. At pit-top only
E. During fuel filling
✅ Answer: A
📝 AV alarms are for reversing operation safety.

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🔹 Circular 8 – DGMS Circulars (2015) – Fatigue & Safety Management in HEMM 

  Q71. 😴 Main focus of Circular 2015 on fatigue was:
A. Increasing production
B. Reducing operator fatigue accidents
C. Blasting efficiency
D. Improving dust suppression
E. Water management
✅ Answer: B
📝 Operator fatigue leads to many accidents. Q72. ⏰ Maximum recommended working hours for HEMM operators per day:
A. 10 hours
B. 12 hours
C. 8 hours
D. 16 hours
E. No limit
✅ Answer: C
📝 Standard = 8 hours/day, beyond which fatigue risk increases. 

  Q73. 🧑‍💼 Who is responsible for implementing fatigue management programs?
A. Operators themselves
B. Mine Manager
C. DGMS Inspector
D. Canteen staff
E. Mechanic
✅ Answer: B
📝 Manager ensures programs & shift schedules. 

  Q74. 🛏️ Fatigue management includes:
A. Proper rest breaks
B. Monitoring working hours
C. Rotation of operators
D. Health awareness
E. All of the above
✅ Answer: E
📝 Combination reduces fatigue-related risks. Q75. 📊 What system was recommended for monitoring operators?
A. Fatigue monitoring devices
B. GPS only
C. AV alarms
D. Manual registers only
E. CCTV only
✅ Answer: A
📝 Devices track drowsiness & alert supervisors. 

  Q76. 🍵 During fatigue prevention breaks, operators should:
A. Sleep inside cabin
B. Leave mine premises
C. Use rest shelters with water, ORS
D. Work overtime
E. Skip breaks for incentives
✅ Answer: C
📝 Rest shelters provide hydration & rest. 

  Q77. 🚫 Fatigue-related accidents are most common in:
A. Workshops
B. Night shifts
C. Blasting zones
D. Pit-top offices
E. None
✅ Answer: B
📝 Night shifts are fatigue-prone. 

  Q78. 🛑 Which is NOT a fatigue countermeasure?
A. Scheduled breaks
B. Limiting overtime
C. Hydration & nutrition
D. Allowing >12 hr shifts
E. Health awareness programs
✅ Answer: D
📝 Long shifts increase fatigue risk. 

  Q79. 👨‍⚕️ Periodic medical check-ups of operators help in:
A. Detecting fatigue-related health issues
B. Reducing blasting cost
C. Improving illumination
D. Reducing slope failures
E. None
✅ Answer: A
📝 PME ensures operators are fit for duty. 

  Q80. 🚦 Fatigue management must be integrated into:
A. Production planning
B. Safety Management System (SMS)
C. Canteen services
D. Blasting schedules
E. Illumination plans
✅ Answer: B
📝 SMS must include fatigue control measures.

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• Circular 9 – DGMS 2012 Circular (Safe Use of Braking Systems in HEMM)
• Circular 10 – DGMS 2010 Circular (AV Alarms for HEMM in Surface Mines)

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📘 100 MCQs on DGMS Circulars for HEMM (Set 5 – Q81 to Q100)

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🔹 Circular 9 – DGMS 2012 – Braking Systems in HEMM 

  Q81. 🛑 The main focus of the 2012 DGMS circular was:
A. Seat belt use
B. Safe braking systems in HEMM
C. Dust suppression
D. Fire suppression
E. Blasting efficiency
✅ Answer: B
📝 Braking failures were causing major dumper accidents. 

  Q82. 🚜 Which type of brakes are compulsory in heavy dumpers?
A. Mechanical brakes only
B. Hydraulic brakes only
C. Service + Parking + Emergency brakes
D. Drum brakes only
E. None
✅ Answer: C
📝 All three braking systems are mandatory. Q83. ⚙️ Parking brakes must be capable of:
A. Holding vehicle only on flat ground
B. Holding vehicle on 1:16 gradient
C. Holding vehicle on steepest working gradient
D. Holding vehicle only when loaded
E. None
✅ Answer: C
📝 Parking brake must hold vehicle on any operating gradient. 

  Q84. 🔍 Brake testing must be done:
A. Once in a year
B. Daily before deployment
C. Only after accident
D. Monthly
E. Every 6 months
✅ Answer: B
📝 Daily testing ensures reliability. 

  Q85. 📝 Records of brake tests must be kept in:
A. DGMS office
B. Operator’s logbook
C. Workshop register
D. Manager’s diary
E. None
✅ Answer: C
📝 Workshop registers maintain inspection & test data. 

  Q86. 🚧 Brake testing areas in workshops must be:
A. Common with parking
B. Clearly marked and isolated
C. Near blasting site
D. Near canteen
E. Anywhere convenient
✅ Answer: B
📝 Brake testing must be done in safe, marked zones. 

  Q87. 🔔 Warning alarms in HEMM braking system indicate:
A. Brake oil low pressure
B. Fuel shortage
C. Seat belt not worn
D. Overloading
E. None
✅ Answer: A
📝 Low hydraulic oil pressure alarm is critical for braking. 

  Q88. ⚠️ What is the role of retarder brakes?
A. Reduce tyre wear
B. Control speed on downhill gradients
C. Stop vehicle instantly
D. Replace service brake
E. Increase fuel efficiency
✅ Answer: B
📝 Retarders reduce speed gradually, especially downhill. 

  Q89. 🧑‍🔧 Who is responsible for ensuring brake maintenance?
A. Operator
B. Workshop in-charge & Manager
C. DGMS inspector
D. Safety officer only
E. None
✅ Answer: B
📝 Maintenance is responsibility of workshop & Manager. 

  Q90. 🏗️ Brake failure incidents must be:
A. Ignored if minor
B. Immediately reported & investigated
C. Reported yearly
D. Only noted by operator
E. Not reportable
✅ Answer: B
📝 Mandatory reporting to DGMS & immediate corrective action.

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🔹 Circular 10 – DGMS 2010 – AV Alarms for HEMM 

  Q91. 🔊 The 2010 circular recommended:
A. Fire extinguishers
B. AV alarms in surface HEMM
C. New blasting standards
D. Illumination levels
E. Dust sampling frequency
✅ Answer: B
📝 AV alarms to prevent accidents during HEMM movement. 

  Q92. 📢 AV alarms are especially important during:
A. Reversing operations
B. Blasting
C. Refueling
D. Tyre changing
E. Rest breaks
✅ Answer: A
📝 Most run-over accidents occur during reversing. 

  Q93. 🚦 AV alarm light must be:
A. Green
B. Red or amber flashing
C. Blue
D. White
E. Any color
✅ Answer: B
📝 Standard = flashing red/amber for visibility. Q94. 👂 AV alarms should be:
A. Audible only in operator’s cabin
B. Audible to nearby workers outside HEMM
C. Not audible
D. Linked with blasting siren
E. None
✅ Answer: B
📝 Designed for ground workers’ safety. 

  Q95. 📊 Minimum sound level of AV alarm = ?
A. Equal to ambient noise
B. 5–10% above ambient noise
C. 50% louder
D. Twice as loud
E. No limit
✅ Answer: B
📝 Must be clearly audible above background noise. 

  Q96. 🛑 The 2010 circular was issued after:
A. Inundation accidents
B. Numerous run-over/backing accidents
C. Dust-related diseases
D. Fire incidents
E. Lightning strikes
✅ Answer: B
📝 Issued due to frequent reversing accidents. Q97. 🧰 AV alarms must be checked:
A. Daily during pre-start inspection
B. Weekly
C. Monthly
D. Annually
E. Not required
✅ Answer: A
📝 Pre-start checks ensure alarms are working. Q98. 👷 Who must ensure installation & maintenance of AV alarms?
A. Operator
B. Mine Manager
C. DGMS Inspector
D. Safety Officer
E. Contractor only
✅ Answer: B
📝 Mine Manager is legally responsible. 

  Q99. 🚜 HEMM without functional AV alarms:
A. Can still operate
B. Must not be deployed
C. Can run only during day
D. Allowed in non-working shifts
E. Only for training
✅ Answer: B
📝 Deployment without alarms is prohibited. Q100. ✅ Overall purpose of AV alarms is:
A. Reduce blasting costs
B. Warn and protect ground personnel from accidents
C. Increase dumper capacity
D. Save fuel
E. None
✅ Answer: B
📝 AV alarms reduce fatal run-over accidents.

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