RRB JE 2015-27-09-2015-1 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-27-09-2015-1 RRB Questions

31.
In a vaccum diode, emission of electrons happens due to
A.
electric field
B.
magnetic field
C.
heating
D.
electron bombardment
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ANSWER :
C. heating
32.
Which of the following cannot actually move?
A.
free electrons
B.
ions
C.
holes
D.
majority careers
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ANSWER :
B. ions
33.
The mean value of half wave rectified sine wave is
A.
0.707 I
B.
0.637 I
C.
0.5 I
D.
0.318 I
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ANSWER :
D. 0.318 I
34.
A silicon controlled rectifier is a
A.
Unijunction device
B.
Device with two junctions
C.
Device with three junctions
D.
Device with four junctions
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ANSWER :
C. Device with three junctions
35.
The unit of elastic modulus is the same as those of
A.
Stress, shear modulus and pressure
B.
Strain, shear modulus and force
C.
Shear modulus, stress and force
D.
Stress, strain and pressure
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ANSWER :
A. Stress, shear modulus and pressure
36.
Relative density of a compacted dense sand is approximately equal to
A.
0.4
B.
0.95
C.
0.50
D.
1.10
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ANSWER :
B. 0.95
37.
Which one of the following is the mode of failure in a fillet weld material?
A.
Tension
B.
Shear
C.
Bearing
D.
Crushing
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ANSWER :
B. Shear
38.
Kinematic viscosity of gases on increase of temperature
A.
Decreases
B.
Increases
C.
Remains the same
D.
First decreases then increases
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ANSWER :
B. Increases
39.
Benchmark is established by
A.
Hypsometry
B.
Barometric levelling
C.
Spirit levelling
D.
Trigonometrical levelling
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ANSWER :
C. Spirit levelling
40.
A critical path has
A.
Zero float
B.
Minimum float
C.
Maximum float
D.
Infinite float
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ANSWER :
A. Zero float