MS Master of Electrical Engineering

Question 1

Which theorem states that the current through a resistor in a linear circuit equals the sum of currents from each independent source acting alone?

Accepted Answer

Superposition Theorem

Answer

The Superposition Theorem states that in a linear circuit, the response is the sum of responses due to each independent source acting alone.

Question 2

What is the Nyquist sampling rate for a signal with a maximum frequency of 5 kHz?

Accepted Answer

10 kHz

Answer

The Nyquist sampling rate must be at least twice the maximum signal frequency, so 2 × 5 kHz = 10 kHz.

Question 3

In a three-phase power system, what is the relationship between line voltage (V_L) and phase voltage (V_ph) in a balanced star (Y) connection?

Accepted Answer

V_L = √3 × V_ph

Answer

In a balanced star connection, the line voltage is √3 times the phase voltage due to the 120° phase displacement between phases.

Question 4

Which type of semiconductor device is primarily used as a voltage-controlled current source in amplifier circuits?

Accepted Answer

MOSFET

Answer

A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) acts as a voltage-controlled current source where gate voltage controls drain current.

Question 5

What does the transfer function H(s) = 1/(s+a) represent in control systems?

Accepted Answer

A first-order low-pass filter

Answer

H(s) = 1/(s+a) represents a first-order low-pass filter with a single real pole at s = -a in the s-domain.

MS - Master of Science Practice Test