Digital Principles And System Design Set 20 MCQs

Q1 | How many NOT gates are required for the construction of a 4-to-1 multiplexer?

3

4

2

5

Q2 | In the given 4-to-1 multiplexer, if c1 = 0 and c0 = 1 then the output M is

x0

x1

x2

x3

Q3 | The enable input is also known as

select input

decoded input

strobe

sink

Q4 | The full form of HDL is

higher descriptive language

higher definition language

hardware description language

high descriptive language

Q5 | The full form of VHDL is

very high descriptive language

verilog hardware description language

variable definition language

none of the mentioned

Q6 | VHSIC stands for

very high speed integrated circuits

very higher speed integration circuits

variable high speed integrated circuits

variable higher speed integration circuits

Q7 | VHDL is being used for

documentation

verification

synthesis of large digital design

all of the mentioned

Q8 | The use of VHDL can be done in ways.

2

3

4

5

Q9 | At high frequencies when the sampling interval is too long in a frequency counter

the counter works fine

the counter undercounts the frequency

the measurement is less precise

the counter overflows

Q10 | The output frequency related to the sampling interval of a frequency counter as

directly with the sampling interval

inversely with the sampling interval

more precision with longer sampling interval

less precision with longer sampling interval

Q11 | In an HDL application of a stepper motor, what is done next after an up/down counter is built?

build the sequencer

test it on a simulator

test the decoder

design an intermediate integer variable

Q12 | In a digital clock application, the basic frequency must be divided down as

1 hz

60 hz

100 hz

1000 hz

Q13 | What does the data signal do in the keypad application?

the row and column encoded data

the ring encoded data

the freeze locator data

the ring counter data

Q14 | When a key is pressed, what does the ring counter in the HDL keypad application do?

count to find the row

freeze

count to find the column

start the d flip-flop

Q15 | A step which should be followed in project management is known as

overall definition

system documentation

synthesis and testing

system integration

Q16 | In the keypad application, the preset state of the ring counter define

the nanding of the columns

the nanding of the rows

the proper output of the column encoder

the proper output of the row encoder

Q17 | A major block which is not a part of an HDL frequency counter

timing and control unit

decoder/display

display register

bit shifter

Q18 | A stepper motor HDL application must include

sequencers and multiplexers

types and bits

counters and decoders

variables and processes

Q19 | Which of the following is a not a characteristics of combinational circuits?

the output of combinational circuit depends on present input

there is no use of clock signal in combinational circuits

the output of combinational circuit depends on previous output

there is no storage element in combinational circuit

Q20 | 11 HDL MODELS OF COMBINATIONAL CIRCUITS

true

false

Q21 | Which of the following is not a combinational circuit?

adder

code convertor

multiplexer

counter

Q22 | In a given combinational circuit, the concurrent statements are used with selected assignments using WHEN and ELSE keyword. What is the other alternative to implement the same?

with-select

with-select-when

if-else

case

Q23 | For using a process to implement a combinational circuit, which signals should be in the sensitivity list?

inputs of the circuit

outputs of the circuit

both of the inputs and outputs

no signal should be in the sensitivity list

Q24 | A 4 to 16 decoder can be used as a code converter. What will be the inputs and outputs of the converter respectively?

binary, octal

octal, binary

hexadecimal, binary

binary, hexadecimal

Q25 | Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature?

low input voltages

synchronous operation

gate impedance

cross coupling