Digital Circuit and Microprocessor MCQs

Question 1

The astable multivibrator shown in Fig. 7.18 has R1=300 CI and C1= 5000pF. The pulse width is

Accepted Answer

1 microsecond

Answer

1 nanosecond

Answer

10 microseconds

Answer

1 millisecond

Question 2

Simplify the following expression F=A11C+All -e +ABC

Accepted Answer

F =AC +A-li

Answer

F = A C +AB

Answer

r =AZ- +AB

Answer

F=A-E

Question 3

For the circuit shown in Fig. 7.20 the output F=0 when

Accepted Answer

both f2 and f3 are 1

Answer

both f2 and f3 are 0

Answer

f2 is 1 and f3 is zero

Answer

f2 is 0 and f3 is one

Question 4

The subroutine of the previous question

Accepted Answer

will terminate when T < < S

Answer

will never terminate

Answer

should have MYSTERY declared REAL

Answer

should have T and Z declared

Question 5

FORTRAN variables may not be declared as

Accepted Answer

TRIPLE PRECISION

Answer

INTEGER

Answer

REAL

Answer

COMPLEX

Question 6

What is the value of the FORTRAN integer variable M =2 +6 * * 2/3 * * 3

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 7

What number does the FORTRAN code segment print? DO 1 1=3,7,3J= 1I. CONTINUEPRINT 2 J2. FORMAT (.1 X, 13)

Accepted Answer

3

Answer

0

Answer

6

Answer

7

Question 8

How many bytes does a 48 K computer memory contain?

Accepted Answer

49152

Answer

47256

Answer

0)48000

Answer

48512

Question 9

The refreshing rate of dynamic RAMs is in the range of

Accepted Answer

2 micro-seconds

Answer

2 milli-seconds

Answer

50 milli-seconds

Answer

500 milli-seconds