Electrical machine MCQ #14


1) Two winding of transformers are connected by means of
     (a) physically link
     (b) inductively link
     (c) conductively link
     (d) not linked

2) Why tap changer is used in transformer?
     (a) adjusting the primary and secondary voltage
     (b) adjusting the secondary voltage
     (c) adjusting the primary voltage
     (d) none of the above

3) The power is transferred in auto transformer through ______.
     (a) conduction process only
     (b) induction process only
     (c) mutual coupling
     (d) both conduction and induction process

4) The rated secondary voltage of 220V for a transformer means the terminal voltage of 220V at which condition?
     (a) rated full load
     (b) no-load
     (c) half full-load
     (d) 1/3rd of full load



ANSWER: | 1-b | 2-b | 3-d | 4-a |

5) The effect of armature reaction on the main flux is
     (a) distorting
     (b) demagnetizing
     (c) distorting and demagnetizing both
     (d) assisting

6) The synchronous reactance is the reaction due to
     (a) armature reaction of the machine
     (b) leakage flux
     (c) either due to armature reaction or leakage flux
     (d) combined reaction due to armature reaction and leakage flux


7) The short circuit characteristic of an alternator is
     (a) always nonlinear
     (b) always linear
     (c) either of (a) or (b)
     (d) none of the above

8) The power factor on which an alternator operates depends on the
     (a) nature of the load being supplied
     (b) speed of prime mover
     (c) armature loss
     (d) copper loss



ANSWER: | 5-c | 6-d | 7-b | 8-a |

9) A leading power factor load on an alternator implies that its voltage regulation shall be
     (a) positive
     (b) negative
     (c) zero
     (d) any one of the above

10) The power factor of an alternator is _______, under short circuit condition
     (a) unity
     (b) almost zero leading
     (c) almost zero lagging
     (d) none of the above

11) The magnitude of field flux ______ in a three-phase synchronous motor.
     (a) varies with load
     (b) remains constant at all loads
     (c) varies with speed
     (d) varies with power factor

12) The electromagnetic power varies _____, in a synchronous motor.
     (a) inversely of applied voltage
     (b) directly as square of applied voltage
     (c) directly as applied voltage
     (d) none of the above



ANSWER: | 9-d | 10-c | 11-b | 12-a |

Electrical machine #12
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To download this MCQ as PDF click here,
Electrical machine MCQ PDF #14

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