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GATE 2019: Network Theory Quiz 4 (App update required to attempt this test)
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Question 1
Three equal star-connected inductors take 10 kW at power factor 0.8 when connected to a 440 V, 3 - φ, 3 wire supply. The two single phase wattmeters are used to measure the power in the circuit. ________ A is the line currents if one of the inductor is short-circuited.
Question 2
A star connected 400 V, 50 Hz, 4 pole synchronous machines gave the following open circuit andshort circuit test results:
Open circuit test: Voc = 400 V (rms, line-to-line) at field current, If = 2.3 A
Short circuit test: Isc = 10 A (rms, phase) at field current, If = 1.5 A
The value of per phase synchronous impedance in Ohm. at rated voltage is_______.
Open circuit test: Voc = 400 V (rms, line-to-line) at field current, If = 2.3 A
Short circuit test: Isc = 10 A (rms, phase) at field current, If = 1.5 A
The value of per phase synchronous impedance in Ohm. at rated voltage is_______.
Question 3
In a balanced three-phase three wire Y – Y connected system as shown below,
the total power dissipated in three-phase load is-
the total power dissipated in three-phase load is-
Question 4
Find the power observed by the load in kW. Assume RYB phase sequence if the balanced start connected load having an impedance (15+j20)Ω per phase is connected to a three phase440V, 50 Hz supply?
Question 5
The pole-zero plots of three discrete-time systems P, Q and R on the z-plane are shown below. 
Which one of the following is TRUE about the frequency selectivity of these systems?
Question 6
The value of Z in figure, which is most appropriate to cause parallel resonance at 500 Hz, is
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Jul 26ESE & GATE EE
