a) sulphur b) odour c) moisture d) both (a) and (c) Ans: (d)
a) increasing the number of turns b) using soft material for winding c) using magnetic core of low reluc-tance d) using transformer oil better quality Ans: (c)
a) the frequency the secondary winding voltage increases b) waveshape of the secondary winding voltage gets distorted c) size of the transformer can be reduced d) eddy current losses increase Ans: (c)
a) is always unit b) is always leading c) is always lagging d) depends on the power factor of load Ans: (d)
a) 1 kVA, 50 Hz b) 1 KVA, 60 Hz c) 1KVA, 100Hz d) 1KVA, 500 Hz Ans: (d)
a) Current b) Voltage c) Frequency d) Both voltage and current Ans: (d)
a) Waveform b) Frequency c) Voltage d) Both frequency and waveform Ans: (d)
a) High reluctance b) High conductivity c) Low reluctance d) Low conductivity Ans: (c)
a) A.C b) D.C c) Both a.c. and d.c. d) Pulsating d.c. Ans: (a)
a) A common core for its primary and secondary winding b) Core of stainless steel and winding of pure copper wire c) No losses and magnetic leakage d) Interleaved primary and secondary windings Ans: (c)
 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 |