Digital Electronics Test 3 - Online Electronics and Communication Engineering Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Marks : 2/20

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DeMorgan's first theorem shows the equivalence of

OR gate and Exclusive OR gate

NOR gate and Bubbled AND gate

NOR gate and NAND gate

NAND gate and NOT gate

[#]

In a 4 input OR gate, the total number of High outputs for the 16 input states are

[#]

In the given figure, the flip flop is

negative edge triggered

positive edge triggered

level triggered

either (a) or (c)

[#]

What will be output for decimal input 82?

0.82 V

8 V

0.1 V

10 mV

[#]

The resolution of 4 bit counting ADC is 0.5 volt, for an Analog input of 6.6 volts. The digital output of ADC will be

1011

1101

1100

1110

[#]

The circuit in the figure is has two CMOS-NOR gates. This circuit functions as a

flip-flop

schmitt trigger

monostable multivibrator

astable multivibrator

[#]

ALU carries out

arithmetic operations

logic operations

both arithmetic and logic operations

none of the above

[#]

The Boolean function A + BC is a reduced form of

AB + BC

(A + B) . (A + C)

AB + ABC

(A + C) . B

[#]

Which of the following pairs of octal and binary numbers are not equal?

111 11011₂ = 767₈

110110101₂ = 665₈

11010₂ = 3₈

10101.11₂ = 25.6₈

[#]

10.

Fastest memory cell

bubble memory

core memory

semiconductor memory

superconductor memory

[#]

11.

In a four variable K map eight adjacent cells give

single variable term

two variable term

three variable term

four variable term

[#]

12.

A mod-2 counter followed by a mod 5 is same as

mod-7 counter

A decade counter

mod-3 counter

none

[#]

13.

The values of 2⁵ in octal system is

400

200

[#]

14.

A Charge Couple Device (CCD) is a

RAM

sequential accessed memory

content addressable memory

read only memory

[#]

15.

Which device uses Pneumatic fluid?

LED

LCD

VF display

None of these

[#]

16.

A(A + B) =

A B

[#]

17.

The 54/74164 chip is an 8-bit serial-input-parallel-output shift register. The clock is 1 MHz. The time needed to shift a 8-bit binary number into the chip is

1 μs

2 μs

8 μs

16 μs

[#]

18.

In a clocked NAND latch, race condition occur when

R and S are high CLK is low

R and CLK are high and S is low

R, S, CLK are high

R, S, CLK are low

[#]

19.

The microprograms provided by a manufacturer to be used on his microprogrammed computer are generally called

software

network

firmware

hardware

[#]

20.

A microcomputer has memory locations from 0000 to FFFF, each storing 1 byte. How many bytes can be the memory store?

12333

14666

16384

16655

[#]

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Online Electronics and Communication Engineering Test - Digital Electronics Test 3

Marks : 2/20

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