A copper wire 200 m long has a resistance of 21 Ω and a diameter of 0.44 mm. Approximately what is its specific resistance?
Correct answer A. 1.6 × 10^-8 Ω·m
Subject / 245 questions
Electrical Engineering MCQs
Electrical Engineering MCQs are multiple-choice questions on electrical principles and devices, with a strong focus on power electronics such as SCRs, GTOs, IGBTs, rectifiers, inverters and commutation, alongside basic circuit theory. They help engineering students and candidates for technical recruitment. Every question shows its correct answer instantly, making it easier to revise device behaviour and formulas.
How does the resistance of semiconductors change as temperature rises?
Correct answer D. Decreases
How does the resistance of pure metals change as temperature rises?
Correct answer B. Increases
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The resistance of a conductor is inversely proportional to which quantity?
Correct answer D. Area of cross-section
Conductance is the reciprocal of which quantity?
Correct answer B. Resistance
What is the property of a conductor that allows it to pass current called?
Correct answer D. Conductance
Which of the following is an insulating material?
Correct answer A. Paper
Which of the following is not a poor conductor?
Correct answer D. Copper
What are substances with many free electrons and low resistance called?
Correct answer A. Conductors
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What is electric pressure also known as?
Correct answer A. Voltage
Approximately how large is a poxvirus?
Correct answer D. 300 nm
Which organisms are included in Kingdom Protoctista?
Correct answer D. Eukaryotic organisms
Which expression gives the minimum filter capacitance in a push-pull converter?
Correct answer B. Cmin = (1 − 2D) V / 32 (Vr L f²)
What does MOSFET stand for?
Correct answer B. Metal–oxide semiconductor field effect transistor
In a flyback converter, the inductor of the buck-boost converter is replaced by what?
Correct answer B. Flyback transformer
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Which of the following is an advantage of the Ćuk converter?
Correct answer D. None of these
Which charge carriers does a MOSFET use for conduction?
Correct answer A. Only majority carriers
What does an RC snubber network used with a BJT do?
Correct answer D. All of these
What dv/dt and di/dt characterise the AC output voltage of a VSI and the AC output current of a CSI respectively?
Correct answer C. High dv/dt, high di/dt
When an inverter takes energy from its AC side and returns it to the DC side, what is this mode of operation called?
Correct answer A. Regenerative mode operation
About Electrical Engineering MCQs
Most questions in this category come from power electronics. Thyristor questions cover the structure of the SCR, holding and latching current, triggering methods, the capacitance of the reverse-biased junction and how to calculate the critical rate of rise of off-state voltage. Gate turn-off thyristor questions ask how much negative gate current is needed to switch off a given anode current, which tests the idea of turn-off gain.
Device comparison questions focus on power transistors and the IGBT, which combines the high input impedance of a MOSFET with the low conduction loss of a bipolar transistor. Converter questions cover natural and forced commutation, rectifiers with filters, single-phase bridge inverters operating in load commutation mode, three-phase voltage source inverters and the Fourier analysis of pulse width modulation. Questions also ask how switching devices are protected and connected in series or parallel.
A smaller set covers circuit fundamentals, such as the voltage induced in an inductor, and topics like man-made noise sources. These MCQs matter for engineering recruitment because power electronics is a core subject in electrical degrees, and technical tests for lecturer, sub-engineer and assistant engineer posts often include direct questions on device characteristics and short calculations. Practising them also builds confidence for viva and interview stages.
Key facts to remember
- An SCR is a four-layer PNPN device with three junctions and three terminals.
- IGBT stands for Insulated Gate Bipolar Transistor, a widely used power switching device.
- An IGBT combines MOSFET-like gate control with the low on-state loss of a bipolar transistor.
- A GTO thyristor can be turned off by applying a negative gate current.
- Holding current is the minimum anode current needed to keep an SCR conducting with the gate open.
- Latching current of an SCR is greater than its holding current.
- The voltage induced across an inductor equals L multiplied by the rate of change of current.
Exams that include Electrical Engineering MCQs
Pakistan
- FPSC
- PPSC
- SPSC
- KPPSC
- NTS
- Lecturer tests
India
- GATE
- UPSC Engineering Services (ESE)
- State PSC exams
- Campus placements
Bangladesh
- BCS
- Government job tests
- Bangladesh Power Development Board recruitment
How to prepare for Electrical Engineering MCQs
- Sketch the layer structure and V-I characteristics of the SCR, TRIAC, DIAC and GTO, since many questions depend on recognising these shapes.
- Practise the dv/dt calculation using charging current divided by junction capacitance, keeping units such as pF and mA consistent.
- Build a comparison table of BJT, MOSFET and IGBT covering drive type, switching speed and conduction loss.
- Learn the classes of forced commutation and their circuits, because examiners often ask which method suits a particular converter.
- Revise rectifier and inverter output waveforms, as questions about harmonics and filtering are easier when you can picture the waveform.
Frequently asked questions
What are the most important topics in Electrical Engineering MCQs?
In this collection the key areas are thyristors and their characteristics, triggering and commutation, GTOs, power transistors and IGBTs, rectifiers, inverters, PWM and basic circuit laws. Short calculations on dv/dt, turn-off gain and induced voltage appear alongside definition-based questions.
Which exams ask Electrical Engineering MCQs?
Technical recruitment for engineers uses these questions. In Pakistan they appear in FPSC, PPSC and other commission tests for engineering and lecturer posts. In India they are relevant to GATE, UPSC ESE and State PSC engineering exams, and in Bangladesh to BCS technical cadre and power sector recruitment.
How many Electrical Engineering MCQs are on MCQs360?
MCQs360 has 249 Electrical Engineering MCQs, with a strong focus on power electronics. Each question shows its correct answer instantly, and practice is free with no sign-up needed. Work through the questions in small sets to keep device details clear.
How should I prepare for Electrical Engineering MCQs?
Revise device theory from a standard power electronics textbook, then practise MCQs on one device at a time. Keep a formula sheet for ratings and calculations, and draw waveforms for converters and inverters. Regular short sessions work better than long ones for retaining device characteristics.
What is the difference between latching current and holding current in an SCR?
Latching current is the minimum anode current that must flow just after triggering for the SCR to stay on once the gate signal is removed. Holding current is the minimum anode current below which a conducting SCR turns off. Latching current is always higher than holding current.
Why is the IGBT widely used in power electronics?
The IGBT is popular because it is voltage-controlled like a MOSFET, so it needs very little gate drive power, while it conducts large currents with low on-state voltage like a bipolar transistor. This makes it well suited to inverters, motor drives and other medium to high power switching circuits.
Last reviewed October 2026