RRB JE 2015-27-09-2015-2 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-27-09-2015-2 RRB Questions

21.
The shaded pole motor is used for
A.
high starting torque
B.
low starting torque
C.
medium starting torque
D.
very high starting torque
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ANSWER :
B. low starting torque
22.
The equipment installed in power plants to reduce air pollution due to smoke is called
A.
De superheaters
B.
Economiser
C.
Preheater
D.
Electrostatic Precipitators
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ANSWER :
D. Electrostatic Precipitators
23.
Which of the following is not a welding accessory?
A.
Goggles
B.
Vacuum cleaner
C.
Gloves
D.
Electrode holder
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ANSWER :
B. Vacuum cleaner
24.
The key job of the relay is to
A.
increase voltage
B.
search the fault
C.
reduce resistance
D.
stop the current flow
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ANSWER :
B. search the fault
25.
100101(base 2) is equal to decimal number
A.
47
B.
37
C.
21
D.
17
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ANSWER :
B. 37
26.
A counter has N flip flops. The total number of states are
A.
N
B.
NĀ²
C.
4N
D.
2^n
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ANSWER :
D. 2^n
27.
In an n-p-n transistor, the majority carriers in the base are
A.
holes
B.
electrons
C.
both holes and electrons
D.
either electrons or holes
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ANSWER :
A. holes
28.
Which of the following is used for generating time varying wave forms?
A.
MOSFET
B.
PIN diode
C.
Tunnel diode
D.
UJT
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ANSWER :
D. UJT
29.
The voltage across a zener diode
A.
is constant in forward direction
B.
is constant in reverse direction
C.
is constant in both forward and reverse direction
D.
is not constant
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ANSWER :
B. is constant in reverse direction
30.
Which of these has highly doped p and n region?
A.
PIN diode
B.
Tunnel diode
C.
Photodiode
D.
Schottky diode
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ANSWER :
B. Tunnel diode