Electrical Engineering practice bits -10

Electrical Engineering practice bits -10

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.     Commutator in DC generator act as

a.     Inverter

b.    Rectifier

c.     Amplifier

d.    Attenuator

2.     Fine scale instruments are used for precision with an accuracy from

a.     0.1 to 0.15

b.    0.1 to 0.2

c.     0.1 to 0.3

d.    0.1 to 0.4

3.     Which instrument issued for measuring the insulation resistance

a.     Ohmmeter

b.    Voltmeter

c.     Ammeter

d.    Megger

4.     Which one of the following is not a advantage of PMMC

a.     Consume less power

b.    Is very delicate

c.     Has efficient damping

d.    Has no loss due to hysteresis

5.     Which type of DC generator is used for welding generator set

a.     DC series generator

b.    DCshunt generator

c.     DC compound generator

d.    DC differential compound generator

6.     The rotating part of DC machine is

a.     Pole

b.    Starter

c.     Armature

d.    Brush

7.     Which of the following motor is suitable for high starting torque

a.     Shunt

b.    Series

c.     Cumulative compound

d.    None

8.     The ratio  of dc motor is an indication of its

a.     Efficiency

b.    Speed regulation

c.     Starting torque

d.    Running torque

9.     The starting current of a 220 V 10 HP shunt motor having an armature resistance of 0.2 ohms without starter is

a.     11 amps

b.    110 amps

c.     1100 amps

d.    11000 amps

10.  All day efficiency meant to judge the performance of ___ transformer (TF)

a.     Distribution TF

b.    Power TF

c.     Auto TF

d.    None

11.  An auto T/F having a turn ratio of 0.7 supply a 10 KW load. The power transferred inductivity is

a.     10KW

b.    7KW

c.     3KW

d.    Zero

12.  Transformer use laminated core

a.     To reduce copper loss

b.    To reduce eddy current loss

c.     Both

d.    None

13.  A 100 KVA 2400V/ 240V 50 Hz transformer has 300 turns on the secondary winding calculate the number of turns in primary winding

a.     1500

b.    1800

c.     2400

d.    3000

14.  The standard value of rated secondary current of the current transformer is

a.     2A

b.    3A

c.     5A

d.    10A

15.  If the full load of  iron loss of the transformer is 1000 watts. What will be the iron loss at half load

a.     125 watts

b.    250 watts

c.     500 watts

d.    1000 watts

16.  The alternators are rated in

a.     KVA

b.    KW

c.     KVAR

d.    ampere hour

17.  the frequency of 96 poles alternator running at 1500 rpm is

a.     75Hz

b.    60Hz

c.     50Hz

d.    40Hz

18.  A 50 Hz alternator will run at the greatest possibility speed if it is wound for ___ poles

a.     8

b.    6

c.     4

d.    2

19.  The wave form of the emf generated by a alternator is

a.     Pulse shaped wave

b.    Square wave

c.     Sine wave

20.  Synchronous motor is mainly used

a.     In lifts and hoist

b.    As power factor correction device

c.     In irrigation pump set

d.    In electric traction

Answers

1.b	2.c	3.d	4.b	5.d	6.c	7.b	8.a	9.c	10.a
11.c	12.b	13.d	14.c	15.d	16.a	17.a	18.d	19.c	20.b

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