Electronics and Communication Engineering Test - Random - 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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RMS value of i(t) = 10[1 + sin (- t)] is

10/2

l50

102

[#]

Two voltages are v₁= 100 sin (ωt + 15°) and v₂ = 60 cosωt, then

v₁ is leading v₂ by 15°

v₁ is leading v₂ by 75°

v₂ is leading v₁ by 75°

v₂ is lagging v₁ by 15°

[#]

If A = 10 + j then log_eA is

14.14 ∠45°

200 ∠45°

2.65 + j45°

2.65 + j0.785

[#]

Assertion (A): Thevenin's theorem and Norton's theorem are dual of each other.

Reason (R): Voltage source can be converted into current source and vice versa.

Both A and R are true and R is correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

[#]

The minimum height of outer atmosphere is

100 km

150 km

200 km

400 km

[#]

Leakage current approximately doubles for every 10°C increase in the temperature of a transistor has I_CBO = 400 nA at 25°C, then its leakage current at 80°C

10 μA

18 μA

20 μA

15 μA

[#]

Which of the following can be used as a buffer amplifier?

Both (a) and (c)

[#]

The IF amplifier in a superheterodyne receiver is

single-stage single-timed amplifier

two stage of single tuned amplifier

double tuned amplifier

class-C amplifier

[#]

Binary number 1101 is equal to octal number

[#]

10.

4 bit ripple counter and 4 bit synchronous counter are made using flip-flop having a propagation delay of 10 ns each. If the worst case delay in the ripple counter and the synchronous counter be R and S respectively, then

R = 10 ns, S = 40 ns

R = 40 ns, S = 10 ns

R = 10 ns, S = 30 ns

R = 30 ns, S = 10 ns

[#]

11.

The initial state of MOD-16 down counter is 011. After 37 clock pulses, the state of the counter will be

1011

0110

0101

0001

[#]

12.

Octal 16 is equal to decimal

[#]

13.

The MOS symbols shown indicates:

that it is depletion type
that it is enhancement type
that it is n channel
that it is p channel
that electrons flow from D to S
that holes flow from D to S

The only true statements are

1, 3, 6

2, 4, 6

1, 3, 5

2, 3, 6

[#]

14.

The purpose of series quadrature windings in amplidyne is to

neutralize the effect of armature reaction

reduce commutation difficulties

increase the gain

increase response time

[#]

15.

For F₂ layer the critical frequency is about

500 MHz

100 MHz

25 MHz

10 MHz

[#]

16.

Which of the following is operating system?

MS WORD

Ventura

Java

Windows

[#]

17.

Which of these are allowed in Basic?

Arithmetic operators +, -, *, / etc.

Logical operators AND, OR, NOT

Relational operators =, <, > etc.

All of the above

[#]

18.

When performing numerical calculations in floating point arithmetic

Error may occur due to finite representation of numbers.
Error may occur due to rounding.
Error may occur due to finite representation of inherently infinite process.

Which of the above are correct?

All

1 and 2 only

1 and 3 only

2 and 3 only

[#]

19.

If f(t) = 1, F(jω) =

2pδ (p)

pδ (ω)

[#]

20.

Modem warfare has changed from large scale clashes of armies to suppression of civilian populations. Chemical agents that do their work silently appear to be suited to such warfare; and regretfully, there exist, people in military establishments who think that chemical agents are useful tools for their cause, which of the following statements best sums up the meaning of the above passage:

Modem warfare has resulted in civil strife.

Chemical agents are useful in modem warfare.

Use of chemical agents in warfare would be undesirable.

People in military establishments like to use chemical agents in war.

[#]

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Online Electronics and Communication Engineering Test - Electronics and Communication Engineering Test - Random

Marks : 2/20

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