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GATE 2019: Topper Quiz 23 (App update required to attempt this test)
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Question 1
The figure shows the circuit diagram of a rectifier. The load consists of a resistance 10Ω and an inductance 0.05 H connected in series. Assuming ideal thyristor and ideal diode, the thyristor firing angle (in degree) needed to obtain an average load voltage of 70 V is _____
Question 2
A sinusoidal ac source in the figure has an rms value of 
Considering all possible values of 
the minimum value of 
in 
to avoid burnout of the Zener diode is_____________
Considering all possible values of the minimum value of in to avoid burnout of the Zener diode is_____________ Question 3
For the network shown in the figure below, the frequency (in rad/s) at which the maximum phase lag occurs is __________.
Question 4
If a feedback control system has its open loop transfer function 
and its root locus plot intersects the imaginary axis at s = 0; then
the value of ‘K’ at this point will be ________.
Question 5
An 8-bit, unipolar Successive Approximation Register type ADC is used to convert 3.5 V to digital equivalent output. The reference voltage is +5 V. The output of the ADC, at the end of 3rd clock pulse after the start of conversion, is
Question 6
In 8085 A microprocessor, the operation performed by the instruction LHLD 2100H is
Question 7
A separately excited DC generator supplies 150 A to a 145 V DC grid. The generator is running at 800 RPM. The armature resistance of the generator is
. If the speed of the generator is increased to 1000 RPM, the current in amperes supplied by the generator to the DC grid is _______.
. If the speed of the generator is increased to 1000 RPM, the current in amperes supplied by the generator to the DC grid is _______. Question 8
A 50 Hz alternator is rated 500 MVA, 20 kV, with Xd = 1.0 per unit and X’’d = 0.2 per unit. It supplies a purely resistive load of 400 MW at 20 kV. The load is connected directly across the generator terminals when a symmetrical fault occurs at the load terminals.
The initial rms current in the generator is (in pu upto one decimal place only)
The initial rms current in the generator is (in pu upto one decimal place only)
Question 9
Find the circulation of the vector A = rcos
. ar + zsin
. az around the edge L of the wedge defined by 
, z=0.
. ar + zsin. az around the edge L of the wedge defined by , z=0.
Question 10
Determine the line integral for the function f(x,y) = xy along the contour defined by the circle 
in the direction of the line.
in the direction of the line.
Question 11
A quartz crystal with dimensions 10 mm × 10 mm × 5 mm has a voltage sensitivity of 50 × 10-3 Vm/N. If a force of 40 N is applied to the crystal, determine the voltage developed.
Question 12
A moving-coil voltmeter has a resistance of 80 Ω. The scale is divided into 120 equal divisions. When a potential difference of 0.8 V is applied to the terminals of the voltmeter a deflection of 80 divisions is obtained. Explain how the instrument could be used for measuring up to 220 V.
Question 13
In the circuit shown below, the supply voltage is 10sin (1000t) volts. The peak value of the steady state current through the Ω resistor, in amperes, is-------------------.
Question 14
In the portion of a circuit shown, if the heat generated in 5
resistance is 10 calories per second then the heat generated by the 4
resistance (in calories per second) is…………….
resistance is 10 calories per second then the heat generated by the 4 resistance (in calories per second) is……………. Question 15
In the circuit shown below.
If the chopper is switched at 1 kHz and with a duty cycle 0.5 then the peak to peak ripple in the load current is ________ A.
If the chopper is switched at 1 kHz and with a duty cycle 0.5 then the peak to peak ripple in the load current is ________ A.
Question 16
A chopper circuit shown below has input dc voltage of 200 V and a load of R = 10 Ω in series with an inductor of L = 80 mH. If load current varies linearly between 12 A and 16 A, then time ratio 
for this chopper is ---------. 
Question 17
The positive, negative and zero sequence impedances of a three-phase generator are 
and 
respectively. For a line-to-line fault with fault impedance 
the fault current is 
where 
is the fault current with zero fault impedance. The relation between 
and 
is
and respectively. For a line-to-line fault with fault impedance the fault current is where is the fault current with zero fault impedance. The relation between and is Question 18
A 50 cycle, 4 pole turbo generator of rating 30MVA, 11.2KV has an inertia constant of 10KW sec/KVA. If the acceleration computed is constant for 10 cycles and input less the rotational losses is 26800 and electric power developed is 16MW. Find the change in torque angle [in Electrical degree] in that period. Assume that the generator is connected to a large system and has no accelerating torque before 10 cycle period commences.
Question 19
Consider the signal
This signal is
This signal is
Question 20
An LTI system having transfer function 
and input x(t)= cos(t+1) is in steady state. The output is sampled at a rate ωs rad/sec to obtain the final output y(t). Which of the following is true?
and input x(t)= cos(t+1) is in steady state. The output is sampled at a rate ωs rad/sec to obtain the final output y(t). Which of the following is true?- 345 attempts
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ESE & GATE EEGeneralJun 21ESE & GATE EE
