Electrical Engineering practice bits -18

Electrical Engineering practice bits -18

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.     Creeping error occurs in which of the following instrument

a.     Energy meter

b.    EMMC

c.     PMMC

d.    MI

2.     Which of the following can be used as light dimming device

a.     Auto transformer

b.    Variable reaction

c.     SCR

d.    All of the above

3.     Galvanized steel wire is generally used as

a.     Stay wire

b.    Earth wire

c.     Structural components

d.    All of the above

4.     A feeder in a transformer system, feeds power to

a.     Distributors

b.    Generating stations

c.     Service mains

d.    All of the above

5.     Cells are connected in series in order to increase the

a.     Current capacity

b.    Life of the cell

c.     Voltage rating

d.    Terminal voltage

6.     Cell are connected in paralled in order to increase the

a.     Life of the cells

b.    Efficiency

c.     Current capacity

d.    Voltage rating

7.     When two cells are connected in parallel, it should ensure that have

a.     Identical internal resistance

b.    Equal emfs

c.     Same ampere hour capacity

d.    None

8.     The capacity of a battery expressed in s

a.     Amperes

b.    Amperes-hour

c.     Watts

d.    Watt-hour

9.     Which one is classified as integrating instruments

a.     Darsonual galvanometer

b.    Ampere hour meters

c.     Ohm-meter

d.    Ammeter

10.  Which of the following types of instrument is an integrating instrument

a.     PF meters

b.    Energy meter

c.     Watt-meter

d.    Frequency meter

11.  The induction motor having 4 pole 50Hz ,slip is 4% .what is the speed of the motor

a.     1500

b.    1440

c.     1000

d.    940

12.  Measurement of frequency by

a.     Owen bridge

b.    Wiens  bridge

c.     Schering bridge

d.    Heaviside bridge

13.  Which material is used in controlling chain reaction in a nuclear reactor

a.     Thorium

b.    Heavy water

c.     Boron

d.    Beryllium

14.  Ash collected in coal mines is

a.     Hopper

b.    Converyor belt

c.     Collector

d.    None

15.  The directional of induced emf can be found by

a.     Laplace law

b.    Lenz law

c.     Flemming’s right hand rule

d.    KVL law

16.  The rms value of AC is equal to

a.     0.637 of max. value

b.    0.707 of max value

c.     1.414 of max value

d.    The maximum value

17.  The value of form factor for a pure sine-wave is

a.     1.414

b.    0.707

c.     0.637

d.    1.11

18.  Power factor is defined as the ratio

a.    

b.   

c.    

d.   

19.  What is the value of line voltage if the value of phase voltage is 240V in y-connection

a.     V_L=400V

b.    V_L=420V

c.     V_L=415V

d.    V_L=440V

20.  Below the breakdown region the leakage current of a silicon diode is of order

a.     1pico amp

b.    100 pico amp

c.     1micro amp

d.    100 micro amp

ANSWERS

1.A	2.D	3.D	4.A	5.C	6.C	7.B	8.B	9.B	10.B
11.A	12.B	13.C	14.A	15.C	16.B	17.D	18.A	19.C	20.A

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