a) Alumimium b) Silicon steel c) Copper d) Wood Ans: (b)
a) Hysteresis loss b) Eddy current loss c) Heat loss d) All of these Ans: (b)
a) 0.35 mm to 0.5 mm b) 3.5 mm to 5 mm c) 35 mm to 50 mm d) 5mm to 10 mm Ans: (a)
a) Area of the core b) Flux density of core material c) Frequency d) Both (b) and (c) Ans: (d)
a) Provide insulation to the windings b) Provide cooling to the windings c) Take insulating oil from the con-servator d) Extract moisture from the air Ans: (d)
a) Drum placed at the bottom of the tank b) An air tight metal drum fixed at the top of the tank c) Overload protection circuit d) None of these Ans: (b)
a) Infinite b) Zero c) About 1 MΩ d) About 100 MΩ Ans: (a)
a) Square core section b) Stepped core section c) Rectangular core section d) None of these Ans: (b)
a) Hysteresis loss is less b) Permeability is higher c) Magnetic reluctance of the three phases can be balanced d) Eddy current loss is less Ans: (c)
a) Eddy current loss b) Insulation requirement c) Leakage fluxes d) Hysteresis loss Ans: (b)
 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 |