In case the back e.m.f. and the speed of a D.C. motor are doubled the torque developed by the motor will
remain unchanged
be doubled
increase four folds
reduce to one-fourth value
remain unchanged
The size of the earth or ground wire is based on the
both (and
rated current carrying capacity of the service line
maximum fault current carrying through the ground wire
depends on the soil resistance
both (and
Earth wire or ground wire is made of
iron
galvanized steel
copper
aluminium
galvanized steel
Average resistance of human body is
1000 ohms
500 ohms
1500 ohms
2000 ohms
1000 ohms
Generally grounding is provided for
none of the above
only for the safety of the operating personnel
only for the safety of the equipment
both (and
both (and
Ground resistance should be designed such that
grounding resistance should be as high as possible
grounding resistance should be always zero
grounding resistance should be as low as possible
none of the above
grounding resistance should be as low as possible
Which of the following is not use as earth continuity conductor ?
all of the above.
structural steel members
gas pipes
water pipes
all of the above.
The diameter of a 50 SWG wire is closer to
0.0253 mm
0.1 mm
0.05 mm
0.5 mm.
0.0253 mm
Non-metallic conduits for wiring are generally made of
wood
PVC.
rubber
cork
PVC.
PVC conduits can be buried on
any of the above.
lime
plaster
concrete
any of the above.
पोस्ट अच्छी लगी हो तो प्लीज नीचे दिए गए लिंक पर क्लिक कर शेयर जरुर करें
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