# VLSI Inverter Delay MCQ Quiz – Objective Question with Answer for VLSI Inverter Delay

1. The resistance value associated with Rp.u is?

A. 2Rs
B. Rs
C. 4Rs
D. Rs/2

The resistance value associated with Rp.u. is 4Rs. Resistance is the measure of difficulty to pass an electric current through that material.

2. The resistance value associated with Rp.d. is?

A. 2Rs
B. Rs
C. 4Rs
D. Rs/2

The resistance value associated with Rp.d. is 1Rs. This is the measure of the difficulty to pass current through the pull-down device.

3. The overall delay of nMOS inverter pair is?

A. 4Ʈ
B. Ʈ
C. 5Ʈ
D. 2Ʈ

The overall delay of nMOS inverter pair is Ʈ+4Ʈ = 5Ʈ. This delay is the time taken for the input signal to get inverted and arrive at the output.

4. The inverter pair delay for inverters having 4:1 ratio is?

A. 4Ʈ
B. Ʈ
C. 5Ʈ
D. 2Ʈ

The inverter pair delay for inverters having a 4:1 ratio is 5Ʈ. This measure of delay is for two inverters, in which the output of the first is given as the input for the second inverter.

5. The asymmetry of resistance value can be eliminated by _______

A. decreasing the width
B. increasing the width
C. increasing the length
D. increasing the width

The asymmetry of resistance value can be eliminated by increasing the width of the p-device channel.

6. The ratio of rise time to fall time can be equated to _______

A. βn/βp
B. βp/βn
C. βp*βn
D. βp/2βn

The ratio of rise time to fall time can be equated to βn/βp. Rise time is the time taken by a signal to change from a specified low value to a specified high value. Fall time is the time taken for the amplitude of a pulse to decrease from a specified value to another specified value.

7. The value µn is equal to ___________

A. µp
B. 0.5µp
C. 1.5µp
D. 2.5µp

The value of µn = 2.5 µp. This shows that µn value is greater than that of the µp.

8. Which quantity is slower?

A. rise time
B. fall time
C. all of the mentioned
D. none of the mentioned

Rise time is slower by a factor of 2.5 than fall time.

9. Condition for achieving symmetrical operation is _______

A. Wp = Wn
B. Wp greater than Wn
C. Wp lesser than Wn
D. Wp lesser than 2Wn

The condition for achieving symmetrical operation is Wp = 2.5 Wn.

10. Rise time and fall time is _____ to load capacitance CL.

A. directly proportional
B. inversely proportional
C. exponentially equal
D. not related