RRB JE 2015-27-09-2015-3 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-27-09-2015-3 RRB Questions

1.
Work done in a free expansion process is
A.
Zero
B.
Positive
C.
Negative
D.
Maximum
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ANSWER :
A. Zero
2.
The internal energy of an ideal gas is
A.
A function of temperature only
B.
A function of pressure
C.
A function of volume
D.
Both pressure and volume
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ANSWER :
A. A function of temperature only
3.
The process in which no heat enters or leaves the system is called
A.
Isobaric
B.
Isothermal
C.
Isentropic
D.
Isochoric
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ANSWER :
C. Isentropic
4.
Ignition quality of diesel fuel is indicated by
A.
Octane number
B.
Cetane number
C.
Raynolds number
D.
Mach number
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ANSWER :
B. Cetane number
5.
In Spark ignition engine, fuel used is
A.
Diesel
B.
Petrol
C.
Kerosene
D.
Both Diesel and kerosene
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ANSWER :
B. Petrol
6.
The heat flow through solids only by
A.
Conduction
B.
Convection
C.
Radiation
D.
Does not flow
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ANSWER :
A. Conduction
7.
A perfect black body is
A.
One which absorbs total radiant energy
B.
Black in colour
C.
One which does not reflect the radiant energy
D.
One which absorbs all radiant energy at all wavelengths
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ANSWER :
D. One which absorbs all radiant energy at all wavelengths
8.
Weld spatter is a welding defect due to
A.
Lack of flux
B.
High welding current
C.
High welding speed
D.
Dirty metal surface
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ANSWER :
B. High welding current
9.
During arc welding, eyes need to be protected against
A.
Intense glare
B.
Microwave
C.
High frequency waves
D.
Ultraviolet and infrared radiation
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ANSWER :
D. Ultraviolet and infrared radiation
10.
Lathe bed is usually made of
A.
Mild steel
B.
Cast iron
C.
High speed steel
D.
Alloy steel
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ANSWER :
B. Cast iron