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GATE 2024 Power systems Rank Booster Quiz 10
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Question 1
The P.S.M of an over current relay is 1.2 and it is connected to a supply circuit through 1000/2 C.T. If the primary current of C.T is 1200Amps and its relay operating coil (ROC) has number of turns 144 . If the Plug setting is adjusted to 4A, then the no turns in the relay operating coil will be________?
Question 2
Which of the following is a universal torque equation
Question 3
A relay at rating 8 A, 2.2 sec IDMT and having a relay setting of 130% TMS = 0.6. It is connected to a supply circuit through a CT ratio 400/5 ratio. If the fault current is 5000 A, the plug setting multiplier of the relay is
Question 4
A differential protection scheme is shown below
The percentage bias is _______%.
Question 5Multiple Correct Options
A transformer, circuit breaker is equipped with 500/5 A CTs connected to a induction type over current relay. The relays have 125% Plug setting and 0.4 time multiplier setting. If A 3ϕ fault current of 7500 A flow, from C T. and relays. Follow characteristics given by below. Table at (TMS = 1), then
Question 6
Figure shows a portion of power system in a single line diagram. Find out the time of operation of Relays R1 and R2 for a fault immediately after relaying point R2. Relay R1 is voltage monitored over-current relay, the plug setting of which reduces to 40% of the set value if voltage collapses below 70% of rated voltage.
Question 7
A 15 MVA, 33/6.6 kv (star-Delta) power transformer is protected by circulating current protection system. If a circulating current 5A is required in pilot wires then the C.T. ratio on primary and secondary side of transformer respectively are
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Nov 3ESE & GATE EE
