Power System - I (3140914) MCQs

MCQs of Underground Cables

Showing 91 to 100 out of 112 Questions
7 8 9 10 11 12
91.
11 kV cable after installation should be checked for short duration at a voltage of
(a) 110 kV
(b) 33 kV
(c) 20 kV
(d) 11 kV
Answer:

Option (c)

92.
The force which are most likely to occur in underground cables are
(a) Breakdown of cable insulation
(b) Short circuit faults
(c) Open circuit faults
(d) All of above
Answer:

Option (d)

93.
The cause of damage to the lead sheath of cables are
(a) Crystallization of lead  through vibration
(b) Chemical reaction with impurities present in a soil
(c) Mechanical  injury
(d) Any of above
Answer:

Option (d)

94.
Loop test in cable cannot locate the
(a) Open circuit  fault
(b) Short circuit fault
(c) Earth fault
(d) None of above
Answer:

Option (a)

95.
In a loop test performed for localizing the earth fault in cable, fault resistance
(a) Affects the balance condition
(b) Affects the sensitivity of bridge
(c) Affect the value of cable resistance
(d) All of above
Answer:

Option (b)

96.
Varley loop tests are performed over Murray loop test because
(a) Varley loop test can locate open circuit fault
(b) Varley loop test gives higher accuracy
(c) Varley loop test provides measurement of total loop resistance
(d) Varley loop test can locate earth fault
Answer:

Option (c)

97.
Open circuit test in a cable can be located by
(a) Blavier’s test
(b) Capacity test
(c) Varley loop test
(d) Murray loop test
Answer:

Option (b)

98.
At NTP the breakdown strength of air is
(a) 30 kVrms/cm
(b) 30 kVpeak/cm
(c) 40 kVpeak/cm
(d) 60 kVpeak/cm
Answer:

Option (b)

99.
The leakage resistance of a 50 km long cable is 1 MΩ. For a 100 km long cable it will be
(a) 1 MΩ
(b) 2 MΩ
(c) 0.66 MΩ
(d) None of the above
Answer:

Option (d)

100.
Sheaths are used in cables to
(a) Provide proper insulation
(b) Provide mechanical strength
(c) Prevent ingress of moisture
(d) None of the above
Answer:

Option (b)

Showing 91 to 100 out of 112 Questions
7 8 9 10 11 12