Power Systems Objective Questions & Answers
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Where the voltage is high and current to be interrupted is low, Which of following the breaker is preferable?
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The unit protection scheme provides
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Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching?
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The rate of rise of restricting voltage depends upon the
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In a biased differential relay the bias is defined as the ratio of
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A 60 Hz, 320 Km loss less line has sending end voltage 1.0 pu. The receiving end voltage on no-load is
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Mho relay is used for the protection of
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Capacitance voltage transformer ( CVT ) is used to
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In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is
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The use of high speed circuit breakers
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The shape of the disc of an induction disc relay is
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Buchholz relay is used for protection of
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The insulation of modern EHV is designed based on
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Zero sequence currents can flow from a line into a transformer bank if the windings are in
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Lightning arresters are used to protect electrical equipment against
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Merze price current scheme protection is used in
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Mho relay is used for protection of
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In an induction relay for a particular current setting the operating time 4 sec. When the time multiplier setting is 0.8 if the time multiplier setting is rest to 1 the operating time is
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If the time of operation of a relay for unity TMS is 10 sec. the time of operation of 0.5 TMS will be _______________ secs.
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Out of the following plant categories which is not the base load power plant?
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Length of the cable is doubled, its capacitance C will be
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What type of back up protection is used for alternators?
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In a 400 kV power network, 360 kV is recorded at 400 kV bus. The reactive power absorbed by a shunt reactor for 50 MVAr, 400 kV connected at the bus is
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The most suitable circuit breaker for short line fault without switching resistor is
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Main bus bar protection scheme is /are
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What will be the ratio of the C.T. on the H.V side of a 3 - φ star / delta 33 / 11 kV transformer if the protecting CT on the LV side has a ratio of 300 : 5 ?
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IF the time of operation of a relay for unity TMS is 10 sec then the time of operation for 0.5 TMS is
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The ratio of reset to pick up current for an induction cup relay is approximately
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To prevent maloperation of deferentially connected relay while energizing a transformer, the relay restraining coil is biased with
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Resistance switching in normally employed in
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