a) Fibre glass b) Plastic c) Mica d) PVC Ans: (c)
a) Carbon b) Copper c) Cast iron d) Steel Ans: (a)
a) Increases b) Decreases c) Remains constant d) Decreases proportional the resistance of field winding Ans: (a)
a) Series generators b) Shunt generators c) Shunt and series generators d) Compound generators Ans: (b)
a) Excitation which is independent of load current b) The advantage over self excited motor that it can be utilised for zero volt to its maximum rated capacity c) A and b both d) None of the above Ans: (c)
a) Constant current drive b) Constant voltage drive c) Constant torque drive d) Constant torque drive Ans: (d)
a) Constant current drive b) Constant voltage drive c) Constant HP drive d) Constant torque drive Ans: (a)
a) Armature control method b) Field control method c) Voltage control method d) All above methods Ans: (a)
a) Field control method b) Armature current control method c) Voltage control method d) All above method Ans: (a)
a) Series motors b) Shunt motors c) Compound motors d) All above motors Ans: (d)
a) Smallest torque breaker b) Highest torque breaker c) Zero torque breaker d) None of them Ans: (b)
a) Plugging b) Dynamic braking c) Counter breaking d) Regenerative braking e) (a) or (c) Ans: (e)
a) Plugging b) Regenerative c) Dynamic braking d) Any of the above Ans: (a)
a) Is to be derated by a factor recommended by manufacturer and select next higher HP motor b) Can be used for 55°C ambient also c) Of lower HP should be selected d) Of high speed should be selected Ans: (a)
a) Select a motor of 150 HP, 1500 r.p.m. b) Select a motor of 1.5 × 150 HP, 1500 r.p.m. c) Select a motor of 150 HP, 750 r.p.m. d) Select a motor of 75 HP, 1500 r.p.m. Ans: (b)