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)
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 Multiple Choice Question (MCQ) of Electronics page-17:241. Which of the following statement is true? a) The saturation voltage VCF of silicon transistor is more than germanium transistor. b) The saturation voltage VCE for germanium transistor is more than silicon transistor. c) The saturation voltage VCE for silicon transistor is same as that for germanium. d) The saturation voltage VCE for silicon transistor is lower than germanium transistor. |
Multiple Choice Question (MCQ) of Electronics page-16:226. Which of the following statement is correct? a) Inner electrons are always present in the semiconductor. b) Bound electrons are always present in the semiconductor. c) Free electrons are always present in the semiconductor. d) Inner and bound electrons are always present in the semiconductor. |
Multiple Choice Question (MCQ) of Electronics page-15:211. The materials whose electrical conductivity is usually less than 1 × 106 mho/m are a) Semiconductors b) Conductors c) Insulators d) Alloys |
Multiple Choice Question (MCQ) of Electronics page-14:196. In which of the following device the base resistors are not added in the package but added externally? a) UJT b) CUJT c) PUT d) None of the above |