#mcqs_electrical_cables (Page -1),
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Pressure cables are generally not used beyond
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20%
A. 11 kV
24%
B. 33 kV
28%
C. 66 kV
28%
D. 132 kV
Solid type cables are considered unreliable beyond 66 kV because
A. Insulation may melt due to higher temperature
B. Skin effect dominates on the conductor
C. Of corona loss between conductor and sheath material
D. There is a danger of breakdown of insulation due to the presence of voids
Answer: Option D
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A. Insulation may melt due to higher temperature
B. Skin effect dominates on the conductor
C. Of corona loss between conductor and sheath material
D. There is a danger of breakdown of insulation due to the presence of voids
Answer: Option D
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The insulation of the cable decreases with
A. The increase in length of the insulation
B. The decrease in the length of the insulation
C. Either (A) or (B)
D. None of the above
Answer: Option A
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A. The increase in length of the insulation
B. The decrease in the length of the insulation
C. Either (A) or (B)
D. None of the above
Answer: Option A
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The thickness of the layer of insulation on the conductor, in cables, depends upon
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0%
A. Reactive power
0%
B. Power factor
73%
C. Voltage
27%
D. Current carrying capacity
The thickness of the layer of insulation on the conductor, in cables, depends upon
A. Reactive power
B. Power factor
C. Voltage
D. Current carrying capacity
Answer: Option C
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A. Reactive power
B. Power factor
C. Voltage
D. Current carrying capacity
Answer: Option C
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The material for armouring on cable is usually
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0%
A. Steel tape
29%
B. Galvanized steel wire
71%
C. Any of the above
0%
D. None of the above
Q) MCQs
In the cables, sheaths are used to
A. Prevent the moisture from entering the cable
B. Provide enough strength
C. Provide proper insulation
D. None of the above
Answer: Option A
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Q) MCQs
In a cable immediately above metallic sheath ________ is provided.
A. Earthing connection
B. Bedding
C. Armouring
D. None of the above
Answer: Option B
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In the cables, sheaths are used to
A. Prevent the moisture from entering the cable
B. Provide enough strength
C. Provide proper insulation
D. None of the above
Answer: Option A
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Q) MCQs
In a cable immediately above metallic sheath ________ is provided.
A. Earthing connection
B. Bedding
C. Armouring
D. None of the above
Answer: Option B
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In capacitance grading of cables we use a _________ dielectric.
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86%
A. Composite
0%
B. Porous
14%
C. Homogeneous
0%
D. Hygroscopic
Dielectric strength of rubber is around
A. 5 kV/mm
B. 15 kV/mm
C. 30 kV/mm
D. 200 kV/mm
Answer: Option C
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The bedding on a cable consists of
A. Hessian cloth
B. Jute
C. Any of the above
D. None of the above
Answer: Option C
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A. 5 kV/mm
B. 15 kV/mm
C. 30 kV/mm
D. 200 kV/mm
Answer: Option C
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The bedding on a cable consists of
A. Hessian cloth
B. Jute
C. Any of the above
D. None of the above
Answer: Option C
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The insulating material for a cable should have
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0%
A. Low cost
0%
B. High dielectric strength
17%
C. High mechanical strength
83%
D. All of the above
Underground cables are laid at sufficient depth
A. To minimize temperature stresses
B. To avoid being unearthed easily due to removal of soil
C. To minimize the effect of shocks and vibrations due to gassing vehicles, etc.
D. For all of the above reasons
Answer: Option C
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A. To minimize temperature stresses
B. To avoid being unearthed easily due to removal of soil
C. To minimize the effect of shocks and vibrations due to gassing vehicles, etc.
D. For all of the above reasons
Answer: Option C
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#mcqs_power_plant_engineering (Page -1),
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Rankine efficiency of a steam power plant
A. improves in summer as compared to that in winter
B. improves in winter as compared to that in summer
C. is unaffected by climatic conditions
D. none of the above
Answer: Option B
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In a boiler installation the natural draught is produced
A. due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in
B. due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
C. due to the fact that at the chimney top the pressure is more than its environmental pressure
D. all of the above
Answer: Option B
A. improves in summer as compared to that in winter
B. improves in winter as compared to that in summer
C. is unaffected by climatic conditions
D. none of the above
Answer: Option B
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In a boiler installation the natural draught is produced
A. due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in
B. due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
C. due to the fact that at the chimney top the pressure is more than its environmental pressure
D. all of the above
Answer: Option B
The artificial draught normally is designed to produce
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0%
A. less smoke
25%
B. more draught
25%
C. less chimney gas temperature
50%
D. all of the above
In De Laval steam turbine
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0%
A. the pressure in the turbine rotor is approximately same as in condenser
50%
B. the pressure in the turbine rotor is higher than pressure in the condenser
50%
C. the pressure in the turbine rotor gradually decreases from inlet to exit from condenser
0%
D. none from the above