Muntaha Nasir ENGINEERING - Electrical Engineering

Which type of transformer connection is commonly used in power transmission to reduce phase imbalance?

A. Star-star. B. Delta-delta. C. Star-delta. D. Delta-star.

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Explanation

Delta-star connections are commonly used in power transmission to reduce phase imbalance and provide a neutral point for grounding.

Muntaha Nasir ENGINEERING - Electrical Engineering

In communication systems, what is the purpose of modulation?

A. Increase signal power. B. Reduce noise. C. Transmit signals over long distances. D. Filter unwanted signals.

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Explanation

Modulation allows signals to be transmitted over long distances by varying a carrier signal's properties, such as amplitude, frequency, or phase.

Muntaha Nasir ENGINEERING - Electrical Engineering

What is the primary function of a varistor in electronic circuits?

A. Voltage regulation. B. Current limiting. C. Surge protection. D. Frequency modulation.

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Explanation

Varistors protect circuits from voltage surges by changing their resistance in response to voltage changes, absorbing excess energy.

Muntaha Nasir ENGINEERING - Electrical Engineering

Which law describes the magnetic force between two parallel current-carrying conductors?

A. Faraday's Law. B. Ampere's Law. C. Coulomb's Law. D. Biot-Savart Law.

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Explanation

Ampere's Law describes the magnetic force between two parallel current-carrying conductors, indicating that the force is proportional to the currents and inversely proportional to the distance between them.

Muntaha Nasir ENGINEERING - Electrical Engineering

In control systems, what is the significance of the transfer function?

A. Stability analysis. B. Frequency response. C. Time response. D. System dynamics.

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Explanation

The transfer function represents the system dynamics, relating input to output and facilitating analysis of system behavior.

Muntaha Nasir ENGINEERING - Electrical Engineering

What is the main purpose of using a triac in AC power control circuits?

A. Rectification. B. Signal amplification. C. Bidirectional control. D. Frequency modulation.

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Explanation

Triacs allow bidirectional control of AC power, making them suitable for applications like light dimming and motor speed control.

Muntaha Nasir ENGINEERING - Electrical Engineering

Which component is essential for providing isolation between the primary and secondary windings of a transformer?

A. Core. B. Insulation. C. Windings. D. Terminals.

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Explanation

Insulation provides electrical isolation between the primary and secondary windings, ensuring safety and efficiency.

Muntaha Nasir ENGINEERING - Electrical Engineering

What is the primary difference between a MOSFET and a BJT?

A. Voltage control vs. current control. B. Analog vs. digital operation. C. Higher vs. lower power handling. D. P-type vs. N-type material.

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Explanation

MOSFETs are voltage-controlled devices, whereas BJTs are current-controlled devices, affecting their use in different applications.

Muntaha Nasir ENGINEERING - Electrical Engineering

In signal processing, what is the primary purpose of a Fourier transform?

A. Amplify signals. B. Filter signals. C. Convert time domain to frequency domain. D. Reduce noise.

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Explanation

The Fourier transform converts signals from the time domain to the frequency domain, allowing analysis of signal frequency components.

Muntaha Nasir ENGINEERING - Electrical Engineering

Which principle explains the operation of a thermocouple in temperature measurement?

A. Joule's Law. B. Seebeck Effect. C. Faraday's Law. D. Ohm's Law.

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Explanation

The Seebeck Effect explains how a thermocouple generates a voltage proportional to the temperature difference between its junctions.