# Multiple Choice Question (MCQ) of Power Systems page-8

91. The effect of shock in the human body will depend on

a) Line voltage
b) Line current
c) Current flowing in the body
d) None of the above

Ans: (c)

92. To protect the power transformer (Y-Y, with neutral earthed) against fault, the current transformer will have

a) Delta-delta connection
b) Delta-star connection
c) Star-delta connection
d) Star-star connection

Ans: (a)

93. To protect the power transformer (Delta-delta) against fault current transformer will have

a) Delta-delta connection
b) Delta-star connection
c) Star-delta connection
d) Star-star connection

Ans: (d)

94. Which of the following alloy is used for the core of the transformer?

a) Invar
b) Nichrome
c) Elinvar
d) Perminvar

Ans: (d)

95. The requirement of the insulation in the transformer or electrical machines design is determined by

a) Current
b) Voltage
c) Rate of the change of the current
d) Rate of the change of voltage
e) Power

Ans: (b)

96. The class C insulation can withstand

a) 180° C
b) 150° C
c) 200° C
d) 105° C

Ans: (a)

97. If the star connected circuit is transformed into delta connected circuit, which of the following statement is true?

a) Ra = R1R2+ R2R3+ R1R3 /R3
b) Ra = R3/R1+ R2
c) Ra = R3/R1 R2 + R2R3+ R1R3
d) Ra = R1 + R2 + R3 /R1 + R2

Ans: (a)

98. The location of the lightning arresters is

a) Near the transformer
b) Away from the transformer
c) Near the circuit breaker
d) Away from the circuit breaker

Ans: (a)

99. The steady-state stability of the power system can be increased by

a) Using machines of high impedance
b) Connecting lines in series
c) Connecting lines in parallel
d) Reducing the excitation of the machines

Ans: (c)

100. With the single frequency transients, the ratio of peak restriking voltage/time between voltage zero and peak voltage is known as

a) Recovery voltage
b) Restriking voltage
c) Rate of rise restriking voltage
d) Active recovery voltage

Ans: (c)

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