Electrical Engineering
GATE EE concept:power-factor PYQs
Build your understanding with focused practice from past exam papers.
How to practice concept:power-factor
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–7 of 7. Imported answers require independent review unless marked reviewed.
Question 27
Open questionEEMCQ1 markNeeds review
The input voltage
and current
of a converter are given by,
where,
. The input power factor of the converter is closest toYour 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 39
Open questionEEMCQ2 marksNeeds review
A 3-phase, star-connected, balanced load is supplied from a 3-phase, 400 V (rms), balanced voltage source with phase sequence R-Y-B, as shown in the figure. If the wattmeter reading is −400 W and the line current is
A (rms), then the power factor of the load per phase 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 33
Open questionEENAT1 markNeeds review
The voltage at the input of an AC-DC rectifier is given by
where
rad/s. The input current drawn by the rectifier is given by
The input power factor, (rounded off to two decimal places), is __________________ lag.
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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 55
Open questionEENAT2 marksNeeds review
A single-phase fully-controlled thyristor converter is used to obtain an average voltage of 180 V with 10 A constant current to feed a DC load. It is fed from single-phase AC supply of 230 V, 50 Hz. Neglect the source impedance. The power factor (round off to two decimal places) of AC mains 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 5
Open questionEEMCQ1 markNeeds review
Two wattmeter method is used for measurement of power in a balanced three-phase load supplied from a balanced three-phase system. If one of the watmeters reads half of the other (both positive), then the power factor of the load 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 23
Open questionEENAT1 markNeeds review
The following measurements are obtained on a single phase load: V = 220 V ±1 %, I = 5.0 A ± 1% and W = 555 W ± 2 %. If the power factor is calculated using these measurements, the worst case error in the calculated power factor in percent is _____. (Give answer up to one decimal place.)
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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 48
Open questionEE-2NAT2 marksNeeds review
In the circuit shown in the figure, the diode used is ideal. The input power factor is __________. (Give the answer up to two decimal places.)
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