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

RRB JE 2015 Question Papers

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

11.
Slag inclusion in casting is a
A.
Internal defect
B.
Moulding defect
C.
Surface defect
D.
Superficial defect
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ANSWER :
C. Surface defect
12.
Knurling is an operation
A.
of cutting smooth collars
B.
of under cutting
C.
done without use of coolant
D.
of generally roughing the surface for hand grip
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ANSWER :
D. of generally roughing the surface for hand grip
13.
The process in which the edge of the sheet is folded over itself to increases the stiffness of the part, is called
A.
Dimpling
B.
Hemming
C.
Spinning
D.
Peen forming
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ANSWER :
B. Hemming
14.
The usual value of the helix angle of a drill is
A.
20°
B.
30°
C.
45°
D.
60°
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ANSWER :
B. 30°
15.
Effective resistance of two wires when connected in series and in parallel are 25 ohms and 6 ohms respectively. The resistances of two wires is
A.
10 ohms and 15 ohms
B.
20 ohms and 30 ohms
C.
5 ohms and 10 ohms
D.
10 ohms and 20 ohms
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ANSWER :
A. 10 ohms and 15 ohms
16.
A closed path made by several branches of network is known as
A.
branch
B.
loop
C.
circuit
D.
junction
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ANSWER :
B. loop
17.
Brushes of DC machines are usually made up of
A.
carbon
B.
mild steel
C.
cast iron
D.
aluminium
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ANSWER :
A. carbon
18.
Small DC motors having upto 5 H.P. usually have
A.
2 poles
B.
4 poles
C.
6 poles
D.
8 poles
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ANSWER :
A. 2 poles
19.
Humming sound produced in a transformer is usually due to
A.
load fluctuations
B.
oil used in the transformer
C.
magnetostriction
D.
mechanical vibrations
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ANSWER :
C. magnetostriction
20.
Which of the following is a widely used insulating and cooling transformer liquid?
A.
mineral oil
B.
water
C.
heavy water
D.
mercury
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ANSWER :
A. mineral oil