RRB JE 2015-26-09-2015-1 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-26-09-2015-1 RRB Questions

31.
Ideal operational amplifier has input impedance of
A.
zero
B.
infinity
C.
1 ohm
D.
0.1 ohm
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ANSWER :
B. infinity
32.
Theoretically, a bridge rectifier has a maximum efficiency of
A.
84%
B.
48.2%
C.
82.2%
D.
81.2%
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ANSWER :
D. 81.2%
33.
Avalanche breakdown is primarily dependent on the phenomenon of
A.
Doping
B.
Collision
C.
Ionisation
D.
Recombination
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ANSWER :
D. Recombination
34.
A UJT contains
A.
4 pn junctions
B.
3 pn junctions
C.
2 pn junctions
D.
1 pn junction
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ANSWER :
D. 1 pn junction
35.
If a material has identical properties in all directions, it is said to be
A.
Homogeneous
B.
Isotropic
C.
Elastic
D.
Orthotropic
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ANSWER :
B. Isotropic
36.
If the plasticity index of a soil mass is zero, the soil is
A.
Loess
B.
Clayey silt
C.
Silt
D.
Sand
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ANSWER :
D. Sand
37.
In RCC beams, as the percentage area of tensile steel increases
A.
Depth of neutral axis increases
B.
Depth of neutral axis decreases
C.
Depth of neutral axis does not change
D.
Lever arm increases
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ANSWER :
A. Depth of neutral axis increases
38.
Fluid is a substance which offers no resistance to change of
A.
Volume
B.
Pressure
C.
Shape
D.
Flow
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ANSWER :
C. Shape
39.
The invar tape is made of an alloy of
A.
Copper and steel
B.
Brass and nickel
C.
Brass and steel
D.
Nickel and steel
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ANSWER :
D. Nickel and steel
40.
Gantt chart provides information about
A.
Break even point analysis
B.
Production schedule
C.
Material handling layout
D.
Determining selling price
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ANSWER :
B. Production schedule