3. A hexadecimal odometer displays F 52 F. The next reading will be

F52E

G52F

F53F

F53O.

Correct answer: (D) F53O.

4. A NAND gate is called a universal logic element because

it is used by everybody

any logic function can be realized by NAND gates alone

all the minization techniques are applicable for optimum NAND gate realization

many digital computers use NAND gates.

Correct answer: (B) any logic function can be realized by NAND gates alone

5. Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

TTLAS

CMOS

ECL

TTLLS

Correct answer: (C) ECL

6. An AND gate will function as OR if

all the inputs to the gates are “1”

all the inputs are ‘0’

either of the inputs is “1”

all the inputs and outputs are complemented.

Correct answer: (D) all the inputs and outputs are complemented.

7. An OR gate has 6 inputs. The number of input words in its truth table are

6

32

64

128

Correct answer: (C) 64

8. Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is

10 CPS

120 CPS

12CPS

None of the above.

Correct answer: (C) 12CPS

9. Consider the representation of six-bit numbers by two’s complement, one’s complement, or by sign and magnitude: In which representation is there overflow from the addition of the integers 011000 and 011000?

Two’s complement only

Sign and magnitude and one’s complement only

Two’s complement and one’s complement only

All three representations.

Correct answer: (D) All three representations.

10. Digital computers are more widely used as compared to analog computers, because they are

less expensive

always more accurate and faster

useful over wider ranges of problem types

easier to maintain.

Correct answer: (C) useful over wider ranges of problem types