Which of the following is NOT a source of harmonic distortion in power converters?

The correct answer is C: Increased ambient temperature. Ambient temperature affects thermal behavior but does not directly cause harmonic distortion. Harmonics arise from non-linear switching, circuit inductances, and device mismatches.

In a bode plot, the magnitude is plotted on a scale of:

The correct answer is B: Decibels (dB) on log scale. Bode plots use dB (20log₁₀|G(jω)|) for magnitude on a logarithmic scale and phase in degrees on a semi-log plot.

In a 400 kV transmission line in India's western grid, if the series reactance is 0.35 Ω/km and the line length is 250 km, what is the total series reactance of the transmission line?

The correct answer is A: 87.5 Ω. Total series reactance = 0.35 Ω/km × 250 km = 87.5 Ω. This is a fundamental calculation for transmission line parameters commonly tested in GATE and ESE.

The reciprocity theorem states that in a linear bilateral network:

The correct answer is C: Excitation and response are interchangeable. Reciprocity theorem: If a voltage source at port 1 produces current at port 2, then the same source at port 2 produces equal current at port 1. Applicable for bilateral linear networks.

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Electrical Engg (EEE)
Power Electronics

Electrical machines, power systems, circuits

25 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–25 of 25

Topics in Electrical Engg (EEE)

All Circuit Analysis 100 Electrical Machines 100 Power Systems 100 Control Systems 100 Power Electronics 100 Electrical Measurements 40 Digital Electronics 100

Q.21 Easy Power Electronics

In MOSFET, the gate-source voltage at which current starts to flow is called:

A Pinch-off voltage

B Threshold voltage

C Breakdown voltage

D Saturation voltage

Correct Answer: B. Threshold voltage

EXPLANATION

Threshold voltage (Vth) is the gate-source voltage required to create an inversion layer and allow current flow in MOSFET.

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Q.22 Easy Power Electronics

The peak inverse voltage (PIV) rating of a diode is important to prevent:

A Forward conduction

B Reverse breakdown

C Forward voltage drop

D Thermal runaway

Correct Answer: B. Reverse breakdown

EXPLANATION

PIV rating defines the maximum reverse voltage a diode can withstand without breaking down. Exceeding this causes reverse breakdown and device failure.

Test

Q.23 Easy Power Electronics

Which device is used to convert DC to AC power?

A Rectifier

B Inverter

C Chopper

D Converter

Correct Answer: B. Inverter

EXPLANATION

An inverter converts DC power to AC power. Rectifiers do the opposite (AC to DC). Choppers convert DC to DC.

Test

Q.24 Easy Power Electronics

The forward voltage drop across a silicon diode at room temperature is approximately:

A 0.2 V

B 0.7 V

C 1.5 V

D 2.0 V

Correct Answer: B. 0.7 V

EXPLANATION

Silicon diodes have a typical forward voltage drop of 0.6-0.7 V at room temperature. Germanium diodes have ~0.3 V.

Test

Q.25 Easy Power Electronics

Which of the following is a unidirectional device in power electronics?

A Diode

B Thyristor

C MOSFET

D Both A and B

Correct Answer: D. Both A and B

EXPLANATION

Both diodes and thyristors are unidirectional devices that conduct current in only one direction. MOSFETs are bidirectional.

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Power Electronics