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 #11
Electrical machine #6
Electrical machine #5
Electrical machine #4
Electrical machine #3
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Electrical machine MCQ PDF #14
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