BE/B Eng Bachelor of Engineering Electrical Engineering 2

Question 1

Which logic gate produces a HIGH output only when all inputs are HIGH?

Accepted Answer

AND

Answer

The AND gate outputs HIGH (1) only when every input is HIGH (1); any LOW input produces a LOW output.

Question 2

What is the purpose of a flyback diode in a DC motor circuit?

Accepted Answer

To protect against voltage spikes when the motor turns off

Answer

A flyback (freewheeling) diode clamps the voltage spike generated by the motor's inductance when current is suddenly interrupted, protecting circuit components.

Question 3

In a three-phase power system, what is the phase difference between each phase voltage?

Accepted Answer

120 degrees

Answer

In a balanced three-phase system, the three sinusoidal voltages are each displaced by 120 degrees from one another.

Question 4

What does the bandwidth of an amplifier represent?

Accepted Answer

The range of frequencies over which gain is within 3 dB of its midband value

Answer

Bandwidth is defined as the frequency range between the lower and upper -3 dB (half-power) points of an amplifier's frequency response.

Question 5

Which type of semiconductor device is commonly used as a voltage regulator in simple circuits?

Accepted Answer

Zener diode

Answer

A Zener diode maintains a nearly constant voltage across its terminals when reverse biased beyond its breakdown voltage, making it ideal for voltage regulation.

BE/B Eng Bachelor of Engineering Practice Test

BE/B Eng Bachelor of Engineering Practice Test

BE/B Eng Bachelor of Engineering Electrical Engineering 2