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GATE 2020: Toppers Quiz 2 (App update required to attempt this test)

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Question 1

A synchronous generator is rated 25 MVA, 11 kV. It is star connected with the neutral point solidly grounded. The generator is operating at no load rated voltage. Its reactance are X₁ = X₂ = 0.20 pu and X₀ = 0.08 pu. Calculate the symmetrical fault current for double line fault.

Question 2

Find the value of load impedance

for maximum power to be transferred for the circuit shown below:

Question 3

A shunt machine connected to 250 V supply has an armature resistance of 0.12 Ω and field resistance of 100 Ω. Then the ratio of the speed of machine as a generator to the machine as a motor, if the line current is 80 A in both cases is

Question 4

The Electric field of a travelling wave propagating through a lossless medium is with µ_r and ε_r as 1 and 64 is

Determine the phase constant β

Question 5

Which of the following signal can be recovered from its samples taken at 180 samples/sec?

Question 6

The coils of a wattmeter have resistances 0.01 Ω and 1000 Ω; their inductance may be neglected. The wattmeter is connected as shown in the figure, to measure the power consumed by a load, which draws 25 A at power factor 0.8. The voltage across the load terminals is 30 V. The percentage error on the wattmeter reading is _________.

Question 7

A 1-Φ AC voltage controller feeds power to a resistive load of 5Ω, from 230 V, 50 Hz source calculate power [in kW] delivered to load when α=π/3.

Question 8

A generator is rated for 0.9 lag power factor. The turbine rating is specified tp match the real power at rated power factor. Assuming the rating of the turbine fixed, determine the reactive power capability at full load?

Question 9

The loop transfer function of a system is given by G(s)H(s) =

. The total number of root loci is:

Question 10

Consider the star network shown in below. The resistance between terminals A and B with C open is 6Ω, between terminals B and C with A open is 11Ω, and between terminals C and A with B open is 9Ω. Then

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ESE & GATE EE General

Sep 15ESE & GATE EE