Online Electronics and Communication Engineering Test - Previous Exam Papers Test 5

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Total number of questions: 20.
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What are the values of E_max and E_min displayed on the oscilloscope, when a 1 kV P-P carries is modulated to 50%?

2 kV, 0.5 kV

1 kV, 0.5 kV

0.75 kV, 0.25 kV

0.5 kV, 1.5 kV

[#]

The equation sin (z) = 10 has

no real or complex solution

exactly two distinct complex solutions

a unique solution

an infinite number of complex solutions

[#]

The logic function f(A B, C) = Σm(0, 2, 4, 5, 6) represented by

i, ii

i, iii

i, ii, iii

[#]

In the given figure

.
The damping coefficient for the given circuit is __________ .

1/2

1/4

[#]

Find the Fourier transform of the half cosine pulse as shown below :

0.5 {sin c [0.25(f - 1)] + sin c [2.5(f + 1)]}

0.5 {sin c [0.5(f - 1)] + sin c [0.5(f + 1)]}

0.25 {sin c [0.25(f - 1)] + sin c [0.25 (f - 1)]}

0.25 {sin c [0.5(f - 1)] + sin c [0.5(f - 1)]}

[#]

For the 8085 assembly language program given below, the content of the accumulator after the execution of the program is

00H

45H

67H

E7H

[#]

Find current i.

4/5 A

5/4 A

1.23 A

1.32 A

[#]

The V_s is given by

8 V

13 V

1 V

4 V

[#]

A system with transfer function

has an output

for the input signal

. Then, the system parameter 'p' is

[#]

10.

In the signal flow graph of figure, y/x equals.

5/2

None of the above

[#]

11.

The Taylor series expansion of

at x = p is given by

[#]

12.

Consider the voltage transfer characteristic of a standard CMOS inverter

where region A corresponds to

NMOS and PMOS triode

Both are saturation

NMOS saturated PMOS linear

None of these

[#]

13.

Which one of the following is applicable to any network-linear or non-linear, active or passive, time-varying or invariant - as long as Kirchhoff laws are not violated?

Tellegen's theorem

Reciprocity theorem

Maximum power transfer theorem

Superposition theorem

[#]

14.

In a network with twelve circuit elements and five nodes, what is the minimum number of mesh equations?

[#]

15.

Assertion (A): The expression E = - ΔV, where E is the electric field and V is the potential is not valid for time varying fields.

Reason (R): The curl of a gradient is identically zero.

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

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

A is true but R is false

A is false but R is true

[#]

16.

Which of the following are included in the architecture of a computer?

Addressing modes, CPU
Instruction set, data formats
Secondary memory, operating system

Select the correct answer from the codes given below:

1 and 2

1 and 3

2 and 3

3 only

[#]

17.

Consider the following statements:
The klystron and travelling wave tube differ from each other,

In TWT the microwave circuit is non- resonant.
In klystron the microwave circuit is resonant.
TWT uses attenuator.
The wave is TWT is a non-propagating wave.

Which of the above statements are correct?

1 and 2 only

3 and 4 only

1, 2 and 3

2, 3 and 4

[#]

18.

Consider the function

where F(s) is the Laplace transform of f(t). What is the steady-state value of f(t)?

Zero

One

Two

A value between - 1 and + 1

[#]

19.

A magnetic field in air is measured to be

What current distribution leads to this field?
[Hint: The algebra is trivial in cylindrical coordinates.]

[#]

20.

Which of the following photodetector does not provide gain?

Phototransistor

Photoconductor

Avalanche photodiode

p-i-n photodiode

[#]

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