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Switchgear Protections - Interview Questions and Answers

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71. The steady state stability of the power system can be increased by
A. connecting lines in parallel
B. connecting lines in series
C. using machines of high impedance
D. reducing the excitation of machines
Explanation:
72. The material used for fuse must have
A. low melting point and high specific resistance
B. low melting point and -low specific resistance
C. high melting point and low specific resistance
D. low melting point and any specific resistance
Explanation:
73. A fuse in a motor circuit provides protection against
A. overload
B. short-circuit and overload
C. open circuit, short-circuit and overload
D. none of the above
Explanation:
74. The fuse rating is expressed in terms of
A. current
B. voltage
C. VAR
D. kVA
Explanation:
75. H.R.C. fuse, as compared to a rewirable fuse, has
A. no ageing effect
B. high speed of operation
C. high rupturing capacity
D. all of the above
Explanation:
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