RRB JE 2015-27-09-2015-2 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-27-09-2015-2 RRB Questions

11.
An ideal tool material is the one which
A.
Has very long life
B.
Has same life at all cutting speed
C.
Produces no heat during cutting
D.
Produces smooth surface finish
😑 View Answer Rough Work
ANSWER :
B. Has same life at all cutting speed
12.
Chills are used in casting moulds to
A.
Achieve directional solidification
B.
Reduce possibility of blow holes
C.
Reduce the freezing time
D.
Increase the smoothness of surface
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ANSWER :
A. Achieve directional solidification
13.
The two parts of a sand casting mould are called
A.
Gate and sprue
B.
Upper and drag
C.
Cope and drag
D.
Cope and bottom
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ANSWER :
C. Cope and drag
14.
An engine operates between temperature limits of 900 K and T2; and another between T2 and 400 K. For both the engines to be equally efficient, T2 should be equal to
A.
600 K
B.
650 K
C.
625 K
D.
700 K
😑 View Answer Rough Work
ANSWER :
A. 600 K
15.
A network or circuit that does not contain any source of emf is known as
A.
Active network
B.
Linear circuit
C.
Bilateral network
D.
Passive network
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ANSWER :
D. Passive network
16.
The number of brushes in the commutator depends upon
A.
speed of armature
B.
type of winding
C.
voltage
D.
amount of current to be collected
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ANSWER :
D. amount of current to be collected
17.
The phenomenon of "crawling" in an induction motor occurs due to
A.
improper design of machine
B.
low voltage supply
C.
high load
D.
harmonics developed in the motor
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ANSWER :
D. harmonics developed in the motor
18.
Determine the speed control method for a DC motor shown in the following figure: [Image - DC motor circuit diagram]
A.
Field diverter method
B.
Armature diverter method
C.
Tapped Field Control
D.
Resistance diverter control
😑 View Answer Rough Work
ANSWER :
A. Field diverter method
19.
A no-load test is performed on a transformer to determine
A.
magnetising current only
B.
core losses only
C.
efficiency
D.
magnetising current and losses
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ANSWER :
D. magnetising current and losses
20.
The ratio of secondary turns to primary in a transformer is 3. If the emf in the secondary coil is 600 V, emf in the primary will be
A.
1800 V
B.
900 V
C.
200 V
D.
600 V
😑 View Answer Rough Work
ANSWER :
C. 200 V