Electrical machine MCQ #12
1) The rating of transformer ________ when the supply
frequency increased.
(a) decrease
(b) increase
(c) remains
unchanged
(d) none
of these
2) In modern alternator, the moving part is
(a) field
system
(b) armature
as well as field system
(c) armature
(d) none
of the above
3) Alternator operates on the principle of
(a) mutual
induction
(b) self-induction
(c) electromagnetic
induction
(d) self
or mutual induction
4) If a 500 KVA, 200Hz transformer is operated at 50Hz,
its KVA rating will be
(a) 500 KVA
(b) 2000
KVA
(c) 1250
KVA
(d) 125
KVA
ANSWER: | 1-b | 2-a | 3-c | 4-d |
5) The armature of an alternator is
(a) the
frame
(b) a
revolving
(c) a
stationary
(d)
consists of winding into which current is produced
6) The stator frame is made up of ____, in the
synchronous motor.
(a) cast
iron or welded plates
(b) CRGOS
(c) stainless
steel
(d)
laminated silicon steel
7) The field system of an alternator is usually excited at
(a) 3 phase,
50 Hz 400 V
(b) 110/220
V AC
(c) 250/250
V DC
(d) 230 V
AC
8) The slip ring employed in a three-phase synchronous
machine are insulated for
(a) output
rated voltage
(b) very
low voltage
(c) low voltage
(d) very
high voltage
ANSWER: | 5-d | 6-a | 7-c | 8-c |
9) Which type of alternator is used in hydroelectric
power station?
(a) salient
pole alternator
(b) Turbo
generator
(c) Non-salient
pole alternator
(d) steam
turbine alternator
10) Hydro-generators are generally employed to run at
_____ rpm.
(a) 3000
(b) 1000
(c) 1500
(d) 500
11) The rotor of turbo alternators is made up of
(a) stainless
steel
(b) cast
iron
(c) forged
steel
(d)
laminated silicon steel
12) The maximum possible speed at which an alternator can
be driven to generate 50 Hz and 4000 V is
(a) 3000
rpm
(b) 3600
rpm
(c) 1500
rpm
(d) 4000
rpm
ANSWER: | 9-a | 10-d | 11-c | 12-a |
Electrical machine #6
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Electrical machine #1
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Electrical machine MCQ PDF #12
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