a) Elimination of harmonic effects b) A low resistance path for the currents due to unbalancing of voltage c) Oscillations when two alternators operate in parallel d) All of these Ans: (d)
a) Salient pole rotors b) Cylindrical rotors c) Both salient pole and cylindrical rotors d) None of these Ans: (b)
a) Asynchronous generator b) Asynchronous motor c) Synchronous generator d) Synchronous motor Ans: (c)
a) Large length to diameter ratio b) Small length to diameter ratio c) Vertical configuration d) None of these Ans: (a)
a) Unity b) 0.7 c) Zero lagging d) Zero leading Ans: (d)
a) Axial ducts only b) Radial dusts only c) Forced air cooling d) Both radial and axial ducts Ans: (d)
a) Prime mover b) Excitation system c) Distribution transformer d) Protection system Ans: (c)
a) Amount of copper in the winding b) Size of the machine c) Harmonics in the generated emf d) Cost of the machine Ans: (c)
a) True sinusoidal b) Non sinusoidal c) Harmonic free d) None of these Ans: (b)
a) Full pitch to the phase emf b) Full pitched coil to the of a chorded coil c) Chorded coil to the of a full pitched coil d) Chorded coil to the phase emf 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 |