Electrical Engineering
GATE EE concept:voltage PYQs
Build your understanding with focused practice from past exam papers.
Questions 31–40 of 61. Imported answers require independent review unless marked reviewed.
Question 25
Open questionEENAT1 markNeeds review
In the circuit shown, a 5 V Zener diode is used to regulate the voltage across load
. The input is an unregulated DC voltage with a minimum value of 6 V and a maximum value of 8 V. The value of
is 6
. The Zener diode has a maximum rated power dissipation of 2.5 W. Assuming the Zener diode to be ideal, the minimum value of
is _____
.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 34
Open questionEEMCQ2 marksNeeds review
In the figure shown, self-impedances of the two transmission lines are 1.5j p.u each, and
p.u is the mutual impedance. Bus voltages shown in the figure are in p.u. Given that
, the maximum steady-state real power that can be transferred in p.u from Bus-1 to Bus-2 is
Your answerChoose one option.
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Open questionEEMCQ2 marksNeeds review
A 3-Bus network is shown. Consider generators as ideal voltage sources. If rows 1, 2 and 3 of the
matrix correspond to Bus 1, 2 and 3, respectively, then
of the network is
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 8
Open questionEEMCQ1 markNeeds review
A lossless transmission line with 0.2 pu reactance per phase uniformly distributed along the length of the line, connecting a generator bus to a load bus, is protected up to 80 % of its length by a distance relay placed at the generator bus. The generator terminal voltage is 1 pu. There is no generation at the load bus. The threshold pu current for operation of the distance relay for a solid three phase-to-ground fault on the transmission line is closest to:
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 9
Open questionEEMCQ1 markNeeds review
Out of the following options, the most relevant information needed to specify the real power (P) at the PV buses in a load flow analysis is
Your answerChoose one option.
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Open questionEEMCQ1 markNeeds review
Thyristor
is triggered at an angle
(in degree), and
at angle
, in each cycle of the sinusoidal input voltage. Assume both thyristors to be ideal. To control the load power over the range 0 to 2 kW, the minimum range of variation in
is: 
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 22
Open questionEENAT1 markNeeds review
A single-phase inverter is fed from a 100 V dc source and is controlled using a quasi-square wave modulation scheme to produce an output waveform,
, as shown. The angle
is adjusted to entirely eliminate the 3rd harmonic component from the output voltage. Under this condition, for
, the magnitude of the 5th harmonic component as a percentage of the magnitude of the fundamental component is ________ (rounded off to 2 decimal places). 
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 47
Open questionEENAT2 marksNeeds review
Bus 1 with voltage magnitude
pu is sending reactive power
towards bus 2 with voltage magnitude
pu through a lossless transmission line of reactance
. Keeping the voltage at bus 2 fixed at 1 pu, magnitude of voltage at bus 1 is changed, so that the reactive power
sent from bus 1 is increased by 20%. Real power flow through the line under both the conditions is zero. The new value of the voltage magnitude,
, in pu (rounded off to 2 decimal places), at bus 1 is ______.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 25
Open questionEENAT1 markNeeds review
The output voltage of a single-phase full bridge voltage source inverter is controlled by unipolar PWM with one pulse per half cycle. For the fundamental rms component of output voltage to be 75% of DC voltage, the required pulse width in degrees (round off up to one decimal place) is __________.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 37
Open questionEEMCQ2 marksNeeds review
A DC-DC buck converter operates in continuous conduction mode. It has 48 V input voltage, and it feeds a resistive load of 24
. The switching frequency of the converter is 250 Hz. If switch-on duration is 1 ms, the load power isYour answerChoose one option.
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