a) It demagnetizes or reduces the main flux b) It cross-magnetizes the main flux c) It magnetizes or reinforces the main flux d) Both (a) and (a) Ans: (d)
a) Always N b) Always S c) Same as the main pole ahead d) Same as main pole behind Ans: (c)
a) Larger b) Smaller c) The same d) Much smaller Ans: (a)
a) Both IPW and CPW are in parallel b) Both IPW and CPW are in series c) IPW is in series and CPW is in parallel d) IPW is in parallel and CPW is in series Ans: (b)
a) Armature reaction in the interpole zone b) Armature reacting in the commu-tating zone c) Armature reaction under the pole faces d) Cross-magnetizing armature reaction Ans: (c)
a) It is cheaper b) It completes the magnetic path c) It gives mechanical protection to the machine d) All of these Ans: (d)
a) Entirely in the armature slots b) Entirely in the slots in the pole faces c) Partly in armature slots and partly in slots in pole faces d) Around the pole core Ans: (b)
a) Pulsating b) Rectangular c) Triangular d) Sinusoidal Ans: (c)
a) Its main switch is suddenly opened b) Its field current is gradually reduced c) The input to its prime move is suddenly reduced to zero d) None of these Ans: (b)
a) Self-excited generator b) Separately excited generator c) Both (a) and (b) d) None of these Ans: (a)
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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 |