# Electronics and Communication Engineering - Digital Electronics

16.

Find the FSV (full scale voltage) in a 6 bit R-2R ladder D/A converter has a reference voltage of 6.5 V.

 A. 6.4 V B. 0.1 V C. 7 V D. 8 V

Explanation:

.

17.

 A. sequential circuit B. combinational circuit C. either sequential or combinational circuit D. none of the above

Explanation:

18.

An 8 bit binary number is to be entered into an 8 bit serial shift register. The number of clock pulses required is

 A. 1 B. 2 C. 4 D. 8

Explanation:

In serial shift register one pulse is needed to store each bit.

19.

In the given figure, A = B = 1 and C = D = 0. Then Y =

 A. 1 B. 0 C. either 1 or 0 D. indeterminate

Explanation:

The CD inputs when fed to NOR gate give output 1. Therefore Y = 1.1.1 = 0.

20.

Assertion (A): CMOS devices have very high speed.

Reason (R): CMOS devices have very small physical size and simple geometry.

 A. Both A and R are correct and R is correct explanation of A B. Both A and R are correct but R is not correct explanation of A C. A is true, R is false D. A is false, R is true