Digital Logic & Number representation

Question 231

The circuit shown in the given figure is a

• full adder
• full subtracter
• shift register
• decade counter

Question 232

When two numbers are added in excess-3 code and the sum is less than 9, then in order to get the correct answer it is necessary to

• subtract 0011 from the sum
• add 0011 to the sum
• subtract 0110 from the sum
• add 0110 to the sum

Question 233

The characteristic equation of an SR flip-flop is given by

• Q_n+1 = S + RQ_n

• Q_n+1= RQ\'_n + SQ_n

• Q_n+1= S\' + RQ_n

• Q_n+1 = S + R\'Q_n

Question 234

The number of digit 1 present in the binary representation of

3 × 512 + 7 × 64 + 5 × 8 + 3

• 8

• 9

• 10

• 12

Question 235

If the bandwidth of a signal is 5 kHz and the lowest frequency is 52 kHz, what is the highest frequency

• 5 kHz
• 10 kHz
• 47 kHz
• 57 kHz

Question 236

0.75 decimal system is equivalent to ____ in octal system

• 0.60
• 0.52
• 0.54
• 0.50

Question 237

In an SR latch made by cross-coupling two NAND gates, if both S and R inputs are set to 0, then it will result in

• Q = 0, Q\' = 1

• Q = 1, Q\' = 0

• Q = 1, Q\' = 1

• Indeterminate states

Question 238

Ring counter is analogous to

• Toggle Switch

• Latch

• Stepping Switch

• S-R flip flop

Question 239

The output 0 and 1 level for TTL Logic family is approximately

• 0.1 and 5V
• 0.6 and 3.5 V
• 0.9 and 1.75 V
• -1.75 and 0.9 V

Question 240

Consider a computer system that stores a floating-point numbers with 16-bit mantissa and an 8-bit exponent, each in two’s complement. The smallest and largest positive values which can be stored are

• 1 × 10 ^-128and 2¹⁵× 10¹⁵
• 1 × 10 ^-256and 2¹⁵× 10²⁵⁵
• 1 × 10 ^-128and 2¹⁵× 10¹²⁷
• 1 × 10 ^-128and 2¹⁵- 1 × 10¹²⁷