Computer Architecture Multiple choice Questions and Answers-Digital Components

21.	How many Flip-Flops are required for mod–16 counter?
a.	5
b.	6
c.	3
d.	4

Discuss

Answer: (d).4

22.	The digital logic family which has minimum power dissipation is
a.	TTL
b.	RTL
c.	DTL
d.	CMOS

Discuss

Answer: (d).CMOS

23.	Data can be changed from special code to temporal code by using
a.	Shift registers
b.	counters
c.	Combinational circuits
d.	A/D converters

Discuss

Answer: (a).Shift registers

24.	A ring counter consisting of five Flip-Flops will have
a.	5 states
b.	10 states
c.	32 states
d.	Infinite states

Discuss

Answer: (a).5 states

25.	The speed of conversion is maximum in
a.	Successive-approximation A/D converter
b.	Parallel-comparative A/D converter
c.	Counter ramp A/D converter
d.	Dual-slope A/D converter

Discuss

Answer: (b).Parallel-comparative A/D converter

26.	The gates required to build a half adder are
a.	EX-OR gate and NOR gate
b.	EX-OR gate and OR gate
c.	EX-OR gate and AND gate
d.	Four NAND gates

Discuss

Answer: (c).EX-OR gate and AND gate

27.	If the input to T-flipflop is 100 Hz signal, the final output of the three T-flipflops in cascade is
a.	1000 Hz
b.	500 Hz
c.	333 Hz
d.	12.5 Hz

Discuss

Answer: (d).12.5 Hz

28.	The device which changes from serial data to parallel data is
a.	COUNTER
b.	MULTIPLEXER
c.	DEMULTIPLEXER
d.	FLIP-FLOP

Discuss

Answer: (c).DEMULTIPLEXER

29.	A device which converts BCD to Seven Segment is called
a.	Encoder
b.	Decoder
c.	Multiplexer
d.	Demultiplexer

Discuss

Answer: (b).Decoder

30.	The access time of ROM using bipolar transistors is about
a.	1 sec
b.	1 msec
c.	1 µsec
d.	1 nsec

Discuss

Answer: (c).1 µsec