- 250 volts
- 125 volts
- 30 volts
- 650 volts
On the surface of the mine/in an O/C mine the voltage may be raised to 250 volts.
- 250 volts
- 125 volts
- 30 volts
- 650 volts
Where hand held portable apparatus is used the voltage shall not exceed 125 volts.
- 10000 volts/6600 volts
- 12000 volts/6500 volts
- 15000 volts/6300 volts
- 11000 volts/6600 volts
- None of these
Electricity shall not be transmitted into a mine at a voltage exceeding 11000 Volts & shall not be used at voltage exceeding 6600 Volts.
- Manager
- Director of Mine Safety
- Director of the company
- Director (Pers.)
- Electrical Superintendent
Manager appoint electrical supervisor for a mine.
- Every day
- Once at least in every 7 days
- Once at least in every 15 days
- Once at least in every 30 days
- None of these
Effectiveness of the switch gear & protective system for automatic disconnection of electric supply to the mine, in case of a fault, shall be checked & recorded Once at least in every 30 days.
- One electrical supervisor
- One electrical supervisor for each district
- One electrical supervisor for each pit
- Adequate number of electrical supervisors as directed by the Inspector
Every mine should have Adequate number of electrical supervisors as directed by the Inspector.
- For at least 10 minutes
- For at least 1hour
- Until the person start breathing / until he is diagnosed dead by the doctor
- None of these
In case of electric shock, if the affected person is not breathing, Until the person start breathing / until he is diagnosed dead by the doctor should artificial respiration is continued.
- So that the joints are not touch one another & there is no chance of short circuiting
- To keep thickness of flexible cable uniform
- To preserve flexibility
- All of the above
When two/more conductors of a flexible cable are joined To preserve flexibility the joints should be widely separated
- Power cores
- Earth cores
- Pilot cores
- Power cores & Pilot cores
- None of the above
Flexible cable for portable apparatus shall have metallic screening on Power cores & Pilot cores
- 90 m
- 100 m
- 150 m
- 200 m
- None of these
cable with any portable & transportable apparatus shall not exceed 100 m
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