RRB JE 2015-16-09-2015-3 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-16-09-2015-3 RRB Questions

21.
The yoke of small DC machine is made up of
A.
Cast iron
B.
Aluminium
C.
Stainless steel
D.
Copper
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ANSWER :
A. Cast iron
22.
The field of self-excited generator is excited by
A.
AC
B.
DC
C.
by its own current
D.
either AC or DC
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ANSWER :
C. by its own current
23.
Electric heater utilizes _____ effect of current.
A.
chemical
B.
heating
C.
mechanical
D.
field
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ANSWER :
B. heating
24.
One B.O.T is:
A.
1 kWh
B.
0.1 kWh
C.
0.01 kWh
D.
0.001 kWh
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ANSWER :
A. 1 kWh
25.
The bond formed by sharing of electrons by two or more atoms is called
A.
Ionic Bond
B.
Metallic Bond
C.
Covalent Bond
D.
Coordinate Bond
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ANSWER :
C. Covalent Bond
26.
The number of atoms in a face centred cubic unit cell is
A.
1
B.
2
C.
3
D.
4
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ANSWER :
D. 4
27.
In semiconductors, a donor may be
A.
a trivalent impurity
B.
a tetravalent impurity
C.
a pentavalent impurity
D.
a noble gas
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ANSWER :
C. a pentavalent impurity
28.
PIN diode in reverse bias condition offers
A.
zero resistance
B.
unit resistance
C.
finite resistance
D.
infinite resistance
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ANSWER :
D. infinite resistance
29.
Which of the following is ultra high switching speed diode
A.
Zener diode
B.
Photo diode
C.
Fast Recovery diode
D.
Tunnel diode
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ANSWER :
C. Fast Recovery diode
30.
For normal operation of a transistor, the collector-base junction is
A.
always reverse biased
B.
always forward biased
C.
is grounded
D.
unbiased
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ANSWER :
A. always reverse biased