Electrical Engineering practice bits -26
The following practice bits are useful the Electrical Aspirants who are preparing for the Different competitive exams like RRB JE ,SSC JE, ECET , GATE , PSU, PGECET,DRDO CEPTAM ,TSTRANSCO, TSGENCO, TSSSPDCL , TSNPDCL AE AND SE, APTRANSCO, APGENCO, ....ETC
MCQ Questions With Answers
1. The
fractional slip of a 3-
motor formula is
motor formula is
a. S=
b. S=
c. S=
d. S=
2. The
principle of operation of an induction motor is based on
a. Faraday’s
law
b. Rotating
magnetic field
c. Fleming
right hand fule
d. Ohm’s
law
3. The
field circuit of an alternator is supplied with
a. An
oscillating current
b. A
direct current
c. An
alternating current
d. A
pulsating current
4. The
frequency generated by a 8 pole alternator rotating at 600 rpm will be
a. 20
Hz
b. 40
Hz
c. 60
Hz
d. 80
Hz
5. What
will happen to 415 V/ 240V, 1KVA transformer when it is connected to a DC
supply
a. Output
will be 240 V
b. Output
will be 415
c. Transformer
may burn
d. Remains
as it is
6. The
application of auto transformer is
a. Series
line boosters
b. Commercial
buildings
c. Eliminators
d. Tong
tester
7. the
emf equation of a 1- transformer is secondary side is
transformer is secondary side is
a. 4.44
fN1 volt
b. 2.22
N2 volt
N2 volt
c. 2.22
f volt
volt
d. 4.44
fN2 volt
volt
8. In
DC motor the back emf(Eb) is directly proportional to ____
a. Flux
b. Speed
c. No
of armature conductor
d. Number
of poles
9. Motor
used in electric traction is
a. Decompounds
b. Dc
shunt
c. Dc
series
d. All
10. In
dc generator commutator made up of
a. Brass
b. Hard
drawn copper
c. Bronte
d. Steel
11. A
moving iron instrument has a ___
a. A
linear scale
b. Non
linear scale
c. Exponential
scale
d. Logarithmic
scale
12. Multi
meter consists of
a. Voltmeter
and ammeter
b. Voltmeter
and ohm meter
c. Voltmeter,
ammeter, ohmmeter
d. None
13. Which
one of the following meter belongs to the integrating type instruments
a. Voltmeter
b. Ammeter
c. Energy
meter
d. Watt
meter
14. The
unit of sensitivity of the instrument is
a. Ohm/
volt
b. Volt/
ohm
c. Volt-amp
d. Ampere/sec
15. The
life of tungsten filament lamp is about
a. 1000hours
b. 2000
hours
c. 4000
hours
d. None
16. The
unit of luminous efficiency is
a. Lumen/
watt
b. Watt/
lumen
c. Lumens
d. Kwh
17. A
lamp emits total flux of 300 lumens the MSCP of the lamp is
b.
3000 
4π
4π
18. If
d is the distance of a surface from a source the illumination upon the surface
will vary as
a.
D
b.
D2
19. Rc
oscillator is suitable for generating
a.
High frequencies
b.
Low frequencies
c.
Both
d.
Audio frequencies
20. The
full form of BIS is
a.
Bureau of institute standards
b.
Bureau of indian standards
c.
Bureau of indian supply
d.
Bureau of institute supply
ANSWERS
1.A
|
2.B
|
3.B
|
4.B
|
5.C
|
6.A
|
7.D
|
8.B
|
9.C
|
10.B
|
11.B
|
12.C
|
13.C
|
14.A
|
15.A
|
16.A
|
17.A
|
18.D
|
19.D
|
20.B
|
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