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

RRB JE 2015 Question Papers

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

1.
Zeroth law of thermodynamics forms the basis of measurement of
A.
Pressure
B.
Temperature
C.
Heat exchange
D.
Work
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ANSWER :
B. Temperature
2.
Internal energy is defined by
A.
Zeroth law of thermodynamics
B.
First law of thermodynamics
C.
Second law of thermodynamics
D.
Law of entropy
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ANSWER :
B. First law of thermodynamics
3.
The concept of overall heat transfer is used in the heat transfer in the case of
A.
Conduction
B.
Convection
C.
Radiation
D.
Combined mode of heat transfer of conduction and convection
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ANSWER :
D. Combined mode of heat transfer of conduction and convection
4.
The unit of thermal conductivity in S.I. unit is
A.
W/mK
B.
W²/mK
C.
W/m²K
D.
W/m
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ANSWER :
A. W/mK
5.
All radiations in a black body are
A.
Reflected
B.
Refracted
C.
Transmitted
D.
Absorbed
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ANSWER :
D. Absorbed
6.
The given P-V diagram indicates following cycle (Diagram: Isentropic expansion from 1 to 2, isentropic compression from 3 to 4, processes at constant volume)
A.
Carnot cycle
B.
Otto cycle
C.
Diesel cycle
D.
Dual cycle
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ANSWER :
B. Otto cycle
7.
If the cut-off ratio is decreased, the efficiency of diesel cycle
A.
Increases
B.
Decreases
C.
Remains constant
D.
May increase or decrease
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ANSWER :
A. Increases
8.
Size of shaper is specified by
A.
Size of table
B.
Length of stroke
C.
Power of motor
D.
Ratio of forward to return stroke
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ANSWER :
B. Length of stroke
9.
Which of the following is an example of orthogonal cutting?
A.
Shaping
B.
Turning
C.
Drilling
D.
Milling
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ANSWER :
B. Turning
10.
Grey cast iron is usually welded by
A.
Gas welding
B.
Resistance welding
C.
Arc welding
D.
Thermit welding
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ANSWER :
A. Gas welding