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

1. Propagation time is directly proportional to ____________

a) x
b) 1/x
c) x2
d) 1/x2

The propagation time is directly proportional to the square of the Propagation distance (x2). It is the time taken by the signal to move from the input port to the output port.

2. The total resistance can be given as ___________

a) nRs
b) nrRs
c) rRs
d) Rs

The total resistance can be given as the product of nrRs where r is the relative resistance per section in terms of Rs.

3. Total capacitance can be given as ___________

a) n(square Cg)
b) nc(square Cg)
c) c(square Cg)
d) square Cg

Total capacitance can be given as the product of nc(square Cg) where c is the relative capacitance per section in terms of square Cg.

4. Overall delay is directly proportional to _______

a) n
b) 1/n
c) n2
d) 1/n2

The overall delay is directly proportional to n2, where n is the number of pass transistors in series.

5. The number of pass transistors connected in series can be increased if _______

a) compressor is connected
b) buffer is connected
c) ground is connected
d) voltage regulator is connected

The number of pass transistors connected in series can be increased by connecting buffer in between.

6. Buffer is used because ___________

a) it increases the speed
b) decreases sensitivity to noise
c) decreases speed
d) does not affect speed

Buffer is used for long polysilicon runs because it increases the speed and reduces the sensitivity to noise.

7. The overall delay is ______ to the relative resistance r.

a) directly proportional
b) inversely proportional
c) exponentially proportional
d) not dependent

The overall delay is directly proportional to the relative resistance r. Overall delay is given as the product of n2rcƮ.

8. Small disturbances of noise ___________

a) decreases the inverter voltage
b) increases the output voltage
c) switches the inverter stage between 0 to 1
d) does not switch the stage and keeps it stable

Small disturbances of noise switch the inverter stage between 0 and 1 or vice versa. It disturbs the normal operation or behavior.

9. The buffer speeds up the ___________

a) rise time
b) fall time
c) all of the mentioned
d) none of the mentioned

The buffer speeds up the rise time of propagated signal edge. A buffer is the combination of two inverters in which one output is fed to the other as the input.

10. Overall delay increases as n ___________

a) increases
b) decreases
c) exponentially decreases
d) logarithmically decreases