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

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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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1.

Assertion (A): In Figure, the intercept of the line on y-axis is equal to N (a_e + a_i), where N is number of atoms/m³, a_e is electronic polarizability and a_i is ionic polarizability.

Reason (R): a_e and a_i are independent of temperature.

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

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

A is true but R is false

A is false but R is true

[#]

2.

Hall effect can be used

to find type of semiconductor (whether p or n)

to find carrier concentration

to measure conductivity

all of the above

[#]

3.

If μ_n is mobility of free electron and μ_p is mobility of holes then for silicon at 300 K

μ_n = μ_p

μ_n > μ_p

μ_n < μ_p

μ_n may be more or less than μ_p

[#]

4.

Semiconductors have

aero temperature coefficient of resistance

positive temperature coefficient of resistance

negative temperature coefficient of resistance

none of the above

[#]

5.

For the network in figure, the correct loop equation for loop 3 is

-I₁ + 4I₂ + 11I₃ = 0

I₁ + 4I₂ + 11I₃ = 0

-I₁ - 4I₂ + 11I₃ = 0

I₁ - 4I₂ + 6I₃ = 0

[#]

6.

Which one of the following theorem can be conveniently used to calculate the power consumed by the 10 Ω resistor in the network shown in the above figure?

Thevenin's theorem

Maximum power transfer theorem

Millman's theorem

Superposition theorem

[#]

7.

The capacitance between two spheres, whose separation is very much larger than their radii R, is given approximately as

2pε₀R

none of the above

[#]

8.

A Darlington pair is used for

low distortion

high frequency range

high power gain

high current gain

[#]

9.

A limiter circuit can be built using a diode and resistance.

True

False

[#]

10.

Which of the following components is essential for a voltage multiplier circuit?

Resistor

Inductor

Capacitor

Both (a) and (c)

[#]

11.

Most of the digital computers do not have floating-point hardware because

floating point hardware is costly

it is slower than software

it is not possible to perform floating point addition by hardware

of not specific reason

[#]

12.

What is the gray code word for EX-OR the binary number 101011?

101011

110101

111110

011111

[#]

13.

The density of the dynamic RAM is

more than that of static RAM

less than that of static RAM

equal to that to static RAM

equal to or more than that of static RAM

[#]

14.

Entropy gives

measure of Uncertainty

rate of Information

average information

probability of Information

[#]

15.

Which of the following is wrong for a magic used to tee?

E and H arms are decoupled

coplanar arms are coupled

all ports are perfectly matched

A signal into coplanar arm splits equally between E and H arms

[#]

16.

A computer program is used to read M and print the sum 2 + 4 + 6 + 8 +.........+ 2M. If M = 9 , the print out will show the number

9

18

90

100

[#]

17.

An experiment is repeated N times. One event A occurs N_A times. Then

[#]

18.

If

is scaled as aⁿ x[n] then ROC changes from `R` to

Ra

R

R/a

R + a

[#]

19.

Match the following:

	Microwave Measuring Instruments		Measurements Effected
A.	Bolometer	1.	Reflection coefficients
B.	VSWR meter	2.	Half power beam widths
C.	Cavity wave meter	3.	Microwave power
D.	Pattern recorder	4.	Microwave frequency

A-2, B-1, C-4, D-3

A-3, B-1, C-4, D-2

A-2, B-4, C-1, D-3

A-3, B-4, C-1, D-2

[#]

20.

The maximum concentration of the element which can be dissolved in solid silicon at a given temperature is termed as

Solid solubility

Dissolution coefficient

Solidification index

Concentration index

[#]

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