a) Three phase alternator, 4 pole wound on 72 slots core b) Three phase alternator, 8 pole wound on 80 slots core c) Three phase alternator, 8 pole wound on 72 slots core d) Three phase alternator, 6 pole wound on 72 slots core Ans: (c)
a) 8 pole synchronous alternator b) 6 pole synchronous alternator c) 4 pole synchronous alternator d) 10 pole synchronous alternator Ans: (b)
a) 10 cycles b) 4 cycles c) 8 cycles d) 16 cycles Ans: (b)
a) 8 pole b) 6 pole c) 4 pole d) 2 pole Ans: (c)
a) The speed of that generator is increased b) The direction that generator is reversed c) The generator takes large share of loads d) The field of that generator is weakened Ans: (c)
a) A single phase induction motor has very high starting torque. b) A single phase induction motor has zero starting torque. c) A single phase starting torque is as good as that of 3 phase induction motor. d) A single phase motor has very small torque but greater than zero. Ans: (b)
a) Primary induced emf b) Secondary induced emf c) Secondary voltage d) Core and copper losses Ans: (b)
a) Low frequency transformers b) High frequency transformers c) 5 kVA, 50 Hz transformers d) None of these Ans: (b)
a) Damper winding on rotor poles b) Damper winding on stator c) (a) or (b) d) None of the above Ans: (a)
a) Fully compensated cross field machine b) Half compensated cross field machine c) Over-compensated cross field machine d) Under-compensated cross field machine Ans: (a)
 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 |
Multiple Choice Question (MCQ) of Electronics page-13:181. The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes d) Electrons e) Holes and electrons simultaneously |