Electrical Engineering practice bits -15

Electrical Engineering practice bits -15

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 capacity of a cell is measured in

a.     Ampere

b.    Ampere-hour

c.     Watts

d.    Watt hours

2.     Active material of a lead acid cell are

a.     Spongy lead

b.    Lead peroxide

c.     Dilute H₂SO₄

d.    All of these

3.     Sulphanation in a lead-acid battery occurs due to

a.     Heavy charging

b.    Fast charging

c.     Trickle charging

d.    Incomplete charging

4.     The capacity of a lead acid cell doesn’t depend on

a.     Temperature

b.    Rate of charge

c.     Rate of discharge

d.    Quantity of active material

5.     During charging the specific gravity of the electrolyte of a Lead acid battery

a.     Increase

b.    Decrease

c.     Remain same

d.    Zero

6.     The continuity  in electrical circuits  is usually checked by

a.     Ohm meter

b.    ammeter

c.     potentiometer

d.    megger

7.     The value of permeability of free space is

a.     4πx10^-9 H/m

b.    4πx10^-8 H/m

c.     4πx10^-8 H/m

d.    4πx10^-6 H/m

8.     The relative permeability of a medium has the units of

a.     Henry/metre

b.    Farad/metre

c.     No units

d.    None

9.     A solenoid coils must have_____

a.     Length and breadth equal

b.    Length greater than breadth

c.     Breadth greater than length

d.    None

10.  In core of a solenoid

a.     Copper is used

b.    Soft iron is used

c.     Aluminium is used

d.    None

11.  For a sinusoidal wave form, form factor is

a.     1.11

b.    1.00

c.     2.22

d.    0.55

12.  For a sinusoidal waveform effective value of voltage is

a.    

b.   

c.    

d.    ½ E²max

13.  If e₁=sin wt and e₂=B sin(wt-) then____

a.     e₁ leads e₂ by

b.    e₂ lags e₁ by

c.    

d.    none

14.  The rms value of a half wave rectified current is 10A. its value for full wave rectified current will be

a.     15A

b.    14.14A

c.    

d.   

15.  The rms value of sinusoidal 80V peak to peak is

a.    

b.   

c.    

d.    40V

16.  The material which is not a semiconductor is

a.     Selenium

b.    Silica

c.     Gallium

d.    copper

17.  The field coils of dc generator are usually made of

a.     Mica

b.    Copper

c.     Cast iron

d.    Carbon

18.  In a commutator

a.     Copper is harder than mica

b.    Mica and copper are equally hard

c.     Mica is harder than copper

d.    None

19.   Creeping error is related to which instrument

a.     wattmeter

b.    energy meter

c.     ammeter

d.    voltmeter

20.  In lap winding the number of brushes is always

a.     Double the number of poles

b.    Same as the number f poles

c.     Half the number of poles

d.    Two

ANSWERS

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

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