BEE Analog and Digital Electronics 3

Question 1

Which of the following correctly describes the operation of a MOSFET in the triode (ohmic) region?

Accepted Answer

VDS < VGS - Vth and VGS > Vth

Answer

The triode region requires the channel to be formed (VGS > Vth) and VDS to be small enough that the channel is not pinched off.

Question 2

The Boolean expression A·(A + B) simplifies to:

Accepted Answer

A

Answer

By the absorption law, A·(A + B) = A·A + A·B = A + A·B = A(1 + B) = A.

Question 3

A 3-bit binary counter using T flip-flops requires T flip-flops that toggle on:

Accepted Answer

Rising edge for LSB, every 2nd edge for middle bit, every 4th edge for MSB

Answer

In a ripple binary counter, the LSB toggles every clock cycle, the next bit every 2 cycles, and the MSB every 4 cycles.

Question 4

An ideal current source has:

Accepted Answer

Infinite internal resistance

Answer

An ideal current source maintains constant current regardless of load, which requires infinite internal (parallel) resistance.

Question 5

In a Phase-Locked Loop (PLL), the voltage-controlled oscillator (VCO) output frequency is controlled by:

Accepted Answer

An error voltage derived from the phase detector output

Answer

The phase detector produces an error voltage proportional to phase difference, which after filtering drives the VCO to lock onto the reference frequency.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

BEE Analog and Digital Electronics 3