Objective Transmission and Distribution Questions and Answers pdf

71.    By which  of the  following methods string efficiency can be improved ?
(a)    Using a guard ring
(b)    Grading the insulator
(c)     Using long cross arm
(d)    Any of the above
(e)    None of the above
Ans: d

72.    In aluminium conductors, steel core is provided to
(a)    compensate for skin effect
(b)    neutralise proximity effect
(c)    reduce line inductance
(d)    increase the tensile strength
Ans: d

73.    By which of the following a bus-bar is rated ?
(a)    Current only
(b)    Current and voltage
(c)    Current, voltage and frequency
(d)    Current, voltage, frequency and short time current
Ans: d

74.    A circuit is disconnected by isolators when
(a)     line is energized
(b)     there is no current in the line
(c)    line is on full load
(d)    circuit breaker is not open
Ans: b

75.    For which of the following equipment current rating is not necessary ?
(a)     Circuit breakers
(b)     Isolators
(c)    Load break switch
(d)    Circuit breakers and load break switches
Ans: b

76.    In a substation the following equipment is not installed
(a) exciters
(b) series capacitors
(c) shunt reactors
(d) voltatre transformers
Ans: a

77.    jCorona usually occurs when the electrostatic stress in air around the conductor exceeds
(a)    6.6 kV (r.m.s. value)/cm
(b)    11 kV (r.m.s. value)/cm
(c)    22 kV (maximum value)/cm
(d)    30 kV (maximum v^lue)/cm
Ans: d

78.    The voltage drop, for constant voltage transmission is compensated by installing
(a) inductors
(b) capacitors
(c) synchronous motors
(d) all of above
(e) none of the above
Ans: c

79.    The use of strain type insulators is made where the conductors are
(a)    dead ended
(b)    at intermediate anchor towers
(c)    any of the above
(d)    none of the above
Ans: c

80.    The current drawn by the line due to corona losses is
(a) non-sinusoidal
(b) sinusoidal
(c) triangular
(d) square
Ans: a

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