Electrical Engineering practice bits -24
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.
A
transformer having 1000 primary turns connected to a 250V ac supply for a
secondary voltage of 400v. the number of secondary turns required are
a.
1600
b.
250
c.
400
d.
1250
2. The
primary and secondary of transformer coupled
a. Electrically
b. Magnetically
c. Both
d. None
3. A
synchronous motor working at leading pf can be used as
a. Synchronous
generator
b. Synchronous
inductor
c. Synchronous
condenser
d. Synchronous
booster
4. Induction
generator runs at
a. Synchronous
speed
b. Above
synchronous speed
c. Below
synchronous speed
d. None
5. A
universal motor is operated on
a. AC
only
b. DC
only
c. Both
AC and DC
d. None
6. Ideal
DC generator has a regulation of
a.
Zero
b.
100%
c.
10%
d.
90%
7. The
yoke of a DC machine is usually made of
a.
Cast
iron
b.
Cast
steel
c.
Rolled
steel
d.
Aluminum
8. An
instrument has full scale deflection of 100mA what is sensitivity
a.
100Ω/volt
b.
10
Ω/volt
c.
10
volt/Ω
d.
100V/Ω
9. When
the moving coil instrument is to be used as ammeter to calculate the shunt
resistance formula used is
a. Rsh=
b. Rsh=
c. Rsh=
d. Rsh=
10. In
electro static voltmeters torque is proportional to
a. V2
b. V
c. I
d. I2
11. Moving
iron instruments accurately reads
a. AC
b. DC
c. Both
in same accuracy
d. None
12. The
pointer in instruments is made up of
a. Steel
b. Iron
c. Aluminum
d. Copper
13. The
secondary circuit of CT should not be ___ while its primary is energized
a. Open
circuited
b. Short
circuited
c. Removed
d. None
14. Which
of the following is fissile material
a. U-238
b. U-234
c. Th-232
d. PU-239
15. Water
hammer in penstocks is prevented by
a. Spill
way
b. Surge
tank
c. Governer
d. None
16. Boron
is used in nuclear reactor
a. Fuel
b. Heat
exchanger
c. Control
rods
d. Moderator
17. Steam
plant works on the principle of
a. Rankine
cycle
b. Carnot
cycle
c. Bryton
cycle
d. None
18. String
efficiency can be increased by
a. Increasing
number of discs
b. Using
earth wire
c. Using
guard ring wire
d. None
19. In
DC corona loss is
a. Less
than AC corona loss
b. Greater
than AC
c. Some
as AC
d. Zero
20. Sag
of conductors between two poles can be determined by
a. 
b. 
c. 
d. 
21. Zero
watt lamp consumes
a. Zero
power
b. About
5 to 7
c. About
15 to 20 W
d. 30W
22. Synchronous
condenser operates at
a. Heavy
loads lagging pf
b. No
load leading pf
c. Light
roads leading pf
d. Heavy
loads leading pf
23. Transformer
is a device which works on
a. Both
ac and dc
b. AC
only
c. DC
only
d. None
of the above
24. Meter
constant of energy meter is
a. Number
of rev/Kwh
b. Number
of pulses/ Kwh
c. Number
of rev/ minute
d. Number
of pulses/ second
25. How
many diodes are required for a bridge rectifier
a. 2
b. 1
c. 3
d. 4
ANSWERS
1.a
|
2.c
|
3.c
|
4.b
|
5.c
|
6.a
|
7.a
|
8.b
|
9.a
|
10.a
|
11.a
|
12.c
|
13.a
|
14.d
|
15.b
|
16.c
|
17.a
|
18.c
|
19.a
|
20.c
|
21.b
|
22.b
|
23.b
|
24.a
|
25.d
|
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