Digital Electronics Test Questions Set 3

1)   If power dissipation and propagation delay in a logic circuit are estimated to be 55mW and 20ns respectively, what will be its figure of merit?

a. 1.10 nanojoule
b. 1.65 nanojoule
c. 2.50 nanojoule
d. 5.5 nanojoule
Answer  Explanation  Related Ques

ANSWER: 1.10 nanojoule

Explanation:
No explanation is available for this question!


2)   What does the diode D3  represents in the equivalent circuit of Multiple Emitter Transistor shown below?

Equivalent Circuit of Multiple Emitter Transistor.png
a. Base to emitter junction
b. Collector to base junction
c. Collector to emitter junction
d. Emitter to emitter junction
Answer  Explanation  Related Ques

ANSWER: Collector to base junction

Explanation:
No explanation is available for this question!


3)   Which is the correct order of sequence for representing the input values in K-map?

a. (00, 01, 10, 11)
b. (00, 10, 01, 11)
c. (00, 01, 11, 10)
d. (00, 10, 11, 01)
Answer  Explanation  Related Ques

ANSWER: (00, 01, 11, 10)

Explanation:
No explanation is available for this question!


4)   Which is the simplified equation of output for K-map consisting of four adjacent ones, given below?

K-map (consisting of four adjacent ones).png
a. A B
b. BD
c. CD
d. ABD
Answer  Explanation  Related Ques

ANSWER: CD

Explanation:
No explanation is available for this question!


5)   Which type of combinational logic circuit is shown below?

Combinational Circuit.png
a. Multiplexer
b. Demultiplexer
c. Encoder
d. Comparator
Answer  Explanation  Related Ques

ANSWER: Multiplexer

Explanation:
No explanation is available for this question!


6)   Which among the following is an octal to binary priority encoder?

a. 74147
b. 74148
c. 74149
d. 74150
Answer  Explanation  Related Ques

ANSWER: 74148

Explanation:
No explanation is available for this question!


7)   Which flip-flop plays a vital role by functioning as the basic building block of a ripple counter?

a. S-R flip-flop
b. J-K flip-flop
c. D flip-flop
d. T flip-flop
Answer  Explanation  Related Ques

ANSWER: T flip-flop

Explanation:
No explanation is available for this question!


8)   Which among the following is not a mode of Flip Flop representation?

a. Characteristic Equations
b. Excitation Tables
c. Finite State Machines (FSM)
d. Variable Entered Mapping (VEM)
Answer  Explanation  Related Ques

ANSWER: Variable Entered Mapping (VEM)

Explanation:
No explanation is available for this question!


9)   In a sequence detector, if the required bit is at its input while checking the sequence bit by bit, the detector moves to ________

a. Previous state
b. Next state
c. Remains in the same state (present state)
d. Null state
Answer  Explanation  Related Ques

ANSWER: Next state

Explanation:
No explanation is available for this question!


10)   Which among the following sequential logic circuits are adopted for the designing of a sequence generator?

a. Shift Registers
b. Counters
c. Both a and b
d. None of the above
Answer  Explanation  Related Ques

ANSWER: Both a and b

Explanation:
No explanation is available for this question!


11)   From the diagram shown below, if the circuit enters into state '5', its next state will be '7'. If the circuit further enters at state'7', then what would be the desirable next state for avoiding the lock out condition?

State Diagram Showing Undesired States.png
a. 0
b. 3
c. 5
d. 7
Answer  Explanation  Related Ques

ANSWER: 0

Explanation:
No explanation is available for this question!


12)   Which among the following are the sequential circuits entering into the phenomenon of lock out condition?

a. Bush circuits
b. Bushless circuits
c. Locked circuits
d. Unlocked circuits
Answer  Explanation  Related Ques

ANSWER: Bushless circuits

Explanation:
No explanation is available for this question!


13)   How many 'D' flip flops will be required for designing the synchronous counter for the state diagram shown below?

State Diagram (with downcounter sequence).png
a. 2
b. 3
c. 5
d. 7
Answer  Explanation  Related Ques

ANSWER: 3

Explanation:
No explanation is available for this question!


14)   The mechanism of 'Bushing' specifically refers to the addition of __________ in the state diagram

a. Nodes
b. Branches
c. Loops
d. States
Answer  Explanation  Related Ques

ANSWER: Branches

Explanation:
No explanation is available for this question!


15)   From the K-map given below, what would be the state equation of D Flip Flop?

K-Map of D Flip Flop.png
a. Qn+1 = QnD
b. Qn+1 = QnD
c. Qn+1 = D
d. Qn+1 = D
Answer  Explanation  Related Ques

ANSWER: Qn+1 = D

Explanation:
No explanation is available for this question!


16)   In the below drawn schematic, what does an arrow between the circles indicate?

State Diagram.png
a. Present state
b. Next state
c. State transition
d. Don't care condition
Answer  Explanation  Related Ques

ANSWER: State transition

Explanation:
No explanation is available for this question!


17)   Which among the following statement/s is/are not an/the advantage/s of Programmable Logic Devices (PLDs)?

a. Short design cycle
b. Increased space requirement
c. Increased switching speed
d. All of the above
Answer  Explanation  Related Ques

ANSWER: Increased space requirement

Explanation:
No explanation is available for this question!


18)   What do the Programmable Logic Devices (PLDs) designed specially for the combinational circuits comprise?

a. Only gates
b. Only flip flops
c. Both a and b
d. None of the above
Answer  Explanation  Related Ques

ANSWER: Only gates

Explanation:
No explanation is available for this question!


19)   With the availability of 16 x 4 memory size, how many ICs ( memory chips) will be required for the expansion of its word size in order to obtain 16 x 8 memory?

a. 2
b. 4
c. 8
d. 16
Answer  Explanation  Related Ques

ANSWER: 2

Explanation:
No explanation is available for this question!


20)   What is the bit storage capacity of TTL RAM cell?

a. 0
b. 1
c. 4
d. 16
Answer  Explanation  Related Ques

ANSWER: 1

Explanation:
No explanation is available for this question!


21)   Which components play a significant role in the formation of a dynamic RAM?

a. Two MOSFETs
b. Two capacitors
c. One MOSFET and one capacitor
d. One MOSFET and two capacitors
Answer  Explanation  Related Ques

ANSWER: One MOSFET and one capacitor

Explanation:
No explanation is available for this question!


22)   Which signal is used to transfer the stored data into RAM?

a. Store
b. Load
c. Recall
d. Move
Answer  Explanation  Related Ques

ANSWER: Recall

Explanation:
No explanation is available for this question!


23)   Which among the following ROMs exhibit/s the necessity of eliminating the PROM from the circuit?

a. EPROM
b. EEPROM
c. Both a and b
d. None of the above
Answer  Explanation  Related Ques

ANSWER: EPROM

Explanation:
No explanation is available for this question!


24)   What does an arrow indicate in the schematic format of process statement given below?

Process Statement Representation.png
a. Variable declaration
b. Process body
c. Process label
d. Sensitivity list
Answer  Explanation  Related Ques

ANSWER: Sensitivity list

Explanation:
No explanation is available for this question!


25)   Which among the following does not belong to the category of sequential statements?

a. If statements
b. Process statements
c. Loop statements
d. Node statements
Answer  Explanation  Related Ques

ANSWER: Node statements

Explanation:
No explanation is available for this question!


26)   Which type of logic is produced by case statements?

a. Serial logic
b. Parallel logic
c. Priority encoded logic
d. Priority decoded logic
Answer  Explanation  Related Ques

ANSWER: Parallel logic

Explanation:
No explanation is available for this question!


27)   Which among the following is not a type of concurrent statement?

a. Simple signal assignment
b. Selected signal assignment
c. Generate statement
d. Direct Instantiation
Answer  Explanation  Related Ques

ANSWER: Direct Instantiation

Explanation:
No explanation is available for this question!


28)   Match the following value kind attributes with their return elements :

A. Value Type attribute -------------------- 1) Length  
B. Value Array attribute ------------------- 2) Information
C. Value Block attribute ------------------- 3) Bounds


a. A- 3, B- 1, C- 2
b. A- 1, B- 2, C- 3
c. A- 2, B- 1, C- 3
d. A- 2, B- 3, C-1
Answer  Explanation  Related Ques

ANSWER: A- 3, B- 1, C- 2

Explanation:
No explanation is available for this question!