RRB JE 2015-26-09-2015-2 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-26-09-2015-2 RRB Questions

21.
Buchholz's relay is used in
A.
motor protection
B.
line protection
C.
generator protection
D.
transformer protection
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ANSWER :
D. transformer protection
22.
The stator frame in an induction motor is used
A.
to protect the whole machine
B.
to ventilate the armature
C.
as a return path for flux
D.
to hold the armature stampings
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ANSWER :
C. as a return path for flux
23.
The starting winding of a single phase winding resides in
A.
armature
B.
field
C.
rotor
D.
stator
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ANSWER :
D. stator
24.
Galvanising is a process of applying a layer of zinc on metal surface. It is also known as
A.
electrorefining
B.
anoding
C.
electroplating
D.
cathoding
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ANSWER :
C. electroplating
25.
A single transistor can be used to build which of the following logic gates
A.
OR
B.
AND
C.
NOR
D.
NOT
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ANSWER :
D. NOT
26.
Which of the following expressions represents logical AND gate?
A.
A+B
B.
A/B
C.
A>B
D.
A.B
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ANSWER :
D. A.B
27.
Substances which generate potential difference when exposed to light are known as
A.
photo voltaic material
B.
light generators
C.
thermoelectric generators
D.
volt generators
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ANSWER :
A. photo voltaic material
28.
Most commonly used control element in voltage regulators is
A.
BJT
B.
UJT
C.
FET
D.
SBS
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ANSWER :
A. BJT
29.
In a differential amplifier, an ideal CMRR is
A.
infinity
B.
zero
C.
+1
D.
-1
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ANSWER :
A. infinity
30.
What is the equivalent of decimal 14 in binary?
A.
1110
B.
1011
C.
1101
D.
1111
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ANSWER :
A. 1110