Deck 7: Digital Circuits and HDL Applications

Question 1

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

A)3
B)4
C)2
D)5

Answer 1

2

Question 2

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

A)x₀
B)x₁
C)x₂
D)x₃

Answer 2

x₁

Question 3

The enable input is also known as______________      

A)select input
B)decoded input
C)strobe
D)sink

Answer 3

strobe

Question 4

The full form of HDL is______________                  

A)higher descriptive language
B)higher definition language
C)hardware description language
D)high descriptive language

Question 5

The full form of VHDL is______________          

A)very high descriptive language
B)verilog hardware description language
C)variable definition language
D)none of the mentioned

Question 6

VHSIC stands for______________          

A)very high speed integrated circuits
B)very higher speed integration circuits
C)variable high speed integrated circuits
D)variable higher speed integration circuits

Question 7

VHDL is being used for______________          

A)documentation
B)verification
C)synthesis of large digital design
D)all of the mentioned

Question 8

The use of VHDL can be done in____________ways.

A)2
B)3
C)4
D)5

Question 9

At high frequencies when the sampling interval is too long in a frequency counter______________          

A)the counter works fine
B)the counter undercounts the frequency
C)the measurement is less precise
D)the counter overflows

Question 10

The output frequency related to the sampling interval of a frequency counter as______________          

A)directly with the sampling interval
B)inversely with the sampling interval
C)more precision with longer sampling interval
D)less precision with longer sampling interval

Question 11

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

A)build the sequencer
B)test it on a simulator
C)test the decoder
D)design an intermediate integer variable

Question 12

In a digital clock application, the basic frequency must be divided down as______________          

A)1 hz
B)60 hz
C)100 hz
D)1000 hz

Question 13

What does the data signal do in the keypad application?

A)the row and column encoded data
B)the ring encoded data
C)the freeze locator data
D)the ring counter data

Question 14

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

A)count to find the row
B)freeze
C)count to find the column
D)start the d flip-flop

Question 15

A step which should be followed in project management is known as______________          

A)overall definition
B)system documentation
C)synthesis and testing
D)system integration

Question 16

In the keypad application, the preset state of the ring counter define______________          

A)the nanding of the columns
B)the nanding of the rows
C)the proper output of the column encoder
D)the proper output of the row encoder

Question 17

A major block which is not a part of an HDL frequency counter______________          

A)timing and control unit
B)decoder/display
C)display register
D)bit shifter

Question 18

A stepper motor HDL application must include

A)sequencers and multiplexers
B)types and bits
C)counters and decoders
D)variables and processes

Question 19

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

A)the output of combinational circuit depends on present input
B)there is no use of clock signal in combinational circuits
C)the output of combinational circuit depends on previous output
D)there is no storage element in combinational circuit

Question 20

Which of the following is not a combinational circuit?

A)adder
B)code convertor
C)multiplexer
D)counter

Question 21

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?

A)with-select
B)with-select-when
C)if-else
D)case

Question 22

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

A)inputs of the circuit
B)outputs of the circuit
C)both of the inputs and outputs
D)no signal should be in the sensitivity list

Question 23

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

A)binary, octal
B)octal, binary
C)hexadecimal, binary
D)binary, hexadecimal

Question 24

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

A)low input voltages
B)synchronous operation
C)gate impedance
D)cross coupling