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

OR

Answer

NAND

Answer

XOR

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

To increase motor speed

Answer

To regulate supply voltage

Answer

To filter AC ripple

Question 3

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

Accepted Answer

120 degrees

Answer

60 degrees

Answer

90 degrees

Answer

180 degrees

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

The maximum output voltage swing

Answer

The input impedance range

Answer

The total harmonic distortion range

Question 5

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

Accepted Answer

Zener diode

Answer

Schottky diode

Answer

PIN diode

Answer

Tunnel diode

Question 6

What is the function of a Phase-Locked Loop (PLL) in communication systems?

Accepted Answer

To synchronize an output signal's phase with a reference input signal

Answer

To amplify weak signals

Answer

To convert analog signals to digital

Answer

To filter out noise from the carrier