BEE Analog and Digital Electronics 5

Question 1

In an R-2R ladder DAC, the primary advantage over a binary-weighted DAC is:

Accepted Answer

Only two resistor values are needed regardless of bit count

Answer

The R-2R ladder uses only two resistor values (R and 2R) for any number of bits, making precision matching much easier to manufacture.

Question 2

Which configuration of an op-amp provides the highest input impedance?

Accepted Answer

Voltage follower (unity gain buffer)

Answer

A voltage follower connects the output directly to the inverting input with the signal at the non-inverting input, yielding input impedance approaching infinity due to near-zero differential input voltage.

Question 3

In a JK flip-flop, setting J=1 and K=1 causes the output to:

Accepted Answer

Toggle to the complement of Q

Answer

The J=K=1 condition is the toggle mode of the JK flip-flop, where Q changes to its complement on each active clock edge.

Question 4

A Wien bridge oscillator uses which type of feedback network to set oscillation frequency?

Accepted Answer

RC lead-lag network

Answer

The Wien bridge uses an RC lead-lag network that provides 0° phase shift at the resonant frequency f = 1/(2πRC), setting the oscillation frequency.

Question 5

In digital logic, the fan-out of a gate refers to:

Accepted Answer

The maximum number of identical gate inputs a gate output can reliably drive

Answer

Fan-out specifies how many standard gate inputs can be connected to a single gate output while maintaining valid logic levels.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

BEE Analog and Digital Electronics 5