Muntaha Nasir ENGINEERING - Electrical Engineering

Which type of circuit is used to generate a specific frequency waveform?

A. Amplifier. B. Oscillator. C. Filter. D. Rectifier.

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Explanation

Oscillators generate specific frequency waveforms, providing stable signal sources for various applications.

Muntaha Nasir ENGINEERING - Electrical Engineering

What is the primary difference between a synchronous motor and an induction motor?

A. Speed control. B. Starting torque. C. Power factor. D. Operating speed synchronization with supply frequency.

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Explanation

Synchronous motors operate at a constant speed synchronized with the supply frequency, unlike induction motors, which have a variable speed.

Muntaha Nasir ENGINEERING - Electrical Engineering

In AC circuits, what is the significance of power factor?

A. Ratio of real power to apparent power. B. Ratio of apparent power to real power. C. Ratio of reactive power to real power. D. Ratio of real power to reactive power.

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Explanation

Power factor is the ratio of real power to apparent power, indicating the efficiency of power usage in AC circuits.

Muntaha Nasir ENGINEERING - Electrical Engineering

What is the main purpose of using a relay in electrical circuits?

A. Voltage amplification. B. Current limitation. C. Signal isolation. D. Frequency modulation.

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Explanation

Relays provide electrical isolation between control and load circuits, enabling low-power signals to control high-power devices.

Muntaha Nasir ENGINEERING - Electrical Engineering

Which phenomenon describes the increase in current flow in a conductor due to reduced cross-sectional area at high frequencies?

A. Eddy currents. B. Skin effect. C. Hall effect. D. Doppler effect.

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Explanation

The skin effect describes the increase in current density near the surface of a conductor at high frequencies, reducing the effective cross-sectional area.

Muntaha Nasir ENGINEERING - Electrical Engineering

In microcontrollers, what is the main function of an ADC (Analog-to-Digital Converter)?

A. Convert digital signals to analog. B. Convert analog signals to digital. C. Amplify analog signals. D. Filter digital signals.

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Explanation

ADCs convert analog signals to digital form, enabling microcontrollers to process real-world analog inputs.

Muntaha Nasir ENGINEERING - Electrical Engineering

What is the primary characteristic of a superconducting material?

A. High resistivity. B. Zero resistivity. C. High conductivity. D. Negative resistivity.

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Explanation

Superconducting materials exhibit zero electrical resistivity below a certain critical temperature, allowing for lossless current flow.

Muntaha Nasir ENGINEERING - Electrical Engineering

Which method is used to analyze the frequency response of linear time-invariant (LTI) systems?

A. Laplace transform. B. Z-transform. C. Bode plot. D. State-space analysis.

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Explanation

The Bode plot is used to analyze the frequency response of LTI systems, providing insights into gain and phase shift across frequencies.

Muntaha Nasir ENGINEERING - Electrical Engineering

In electrical machines, what is the purpose of using a commutator in a DC motor?

A. Increase speed. B. Reduce losses. C. Convert AC to DC. D. Reverse current direction.

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Explanation

The commutator in a DC motor reverses the current direction in the armature windings, ensuring unidirectional torque.

Muntaha Nasir ENGINEERING - Electrical Engineering

What is the primary advantage of using a CMOS technology in integrated circuits?

A. High power consumption. B. Low noise immunity. C. High speed. D. Low power consumption.

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Explanation

CMOS technology is favored for its low power consumption, making it ideal for battery-powered and portable devices.