RRB JE 2015-26-09-2015-3 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-26-09-2015-3 RRB Questions

21.
Which of the following is not fitted on transformer?
A.
Commutator
B.
Breather
C.
Conservator
D.
Buchholz Relay
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ANSWER :
A. Commutator
22.
Open circuit test in transformers is conducted to determine
A.
hysteresis losses
B.
copper losses
C.
core losses
D.
eddy current losses
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ANSWER :
C. core losses
23.
The given figure is the Torque-Current characteristics of (Diagram: Torque vs Current curve showing initial rise then fall)
A.
Cumulative Compound motor
B.
Shunt motor
C.
Series motor
D.
Differential Compound motor
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ANSWER :
D. Differential Compound motor
24.
Which of the following is not a non-linear element?
A.
Gas diode
B.
Heater coil
C.
Tunnel diode
D.
Electric arc
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ANSWER :
B. Heater coil
25.
Which of the following is known as metal rectifier?
A.
Selenium disc rectifier
B.
Copper oxide rectifier
C.
Gas tube diode
D.
Varactor diode
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ANSWER :
B. Copper oxide rectifier
26.
For full-wave rectified sine wave, form factor is
A.
1.41
B.
1.11
C.
1.5
D.
1.28
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ANSWER :
B. 1.11
27.
Electron pair bonding occurs when atoms
A.
lack electrons
B.
lack holes
C.
share electrons
D.
share holes
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ANSWER :
C. share electrons
28.
In a p type semiconductor, minority carriers are
A.
holes
B.
electrons
C.
dopants
D.
atoms
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ANSWER :
B. electrons
29.
Which of the following is a pentavalent material?
A.
carbon
B.
boron
C.
phosphorus
D.
silicon
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ANSWER :
C. phosphorus
30.
Another name for a unity gain amplifier is
A.
difference amplifier
B.
comparator
C.
single ended
D.
voltage follower
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ANSWER :
D. voltage follower