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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Which of the following is true as regards photo emission?

Velocity of emitted electrons is dependent on light intensity

Rate of photo emission is inversely proportional to light intensity

Maximum velocity of electron increases with decreasing wave length

Both holes and electrons are produced

[#]

When p-n junction is reverse biased the holes in p material move towards the junction and electrons in n material move away from the junction.

True

False

[#]

In active filter circuits, inductances are avoided mainly because they

are always associated with some resistance

are bulky and unsuitable for miniaturisation

are non-linear in nature

saturate quickly

[#]

Hay bridge is suitable for measuring inductance of which one of the following inductors?

Having Q value less than 10

Having Q value greater than 10

Having any value of Q

Having phase angle of reactance very large

[#]

A P-N junction diode dynamic conductance is directly proportional to

the applied voltage

the temperature

its current

thermal voltage

[#]

The equivalent circuit of an ideal diode is

a charging condenser

a discharging condenser

a switch

a resistor

[#]

The average value of delayed full wave rectified sine wave (figure) is

[#]

When sources of different frequencies feed a network the only method of solution is superposition theorem.

True

False

[#]

Without a spectrum analyser, it is not possible to determine

carrier frequency

antenna pattern

pulse width

spurious signal strength and its location

[#]

10.

Which of the following contributes to harmonics distortion in amplifiers?

Positive feedback

Presence of noise

Defective active device

Non-linearity in active device

[#]

11.

Equation x_l0 = 11001001₂ when solved for x gives the value of x as

111

152

201

[#]

12.

A stepper motor is

a two phase induction motor

is a kind of rotating amplifier

is an electromagnetic transducer used to convert an angular position of shaft into electrical signal

is an electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis

[#]

13.

Trap circuits used in video IF amplifier of colour TV are

High Q, LC resonant circuit

Low Q, LC resonant circuit

High Q, RLC resonant circuit

Low Q, RLC resonant circuit

[#]

14.

Each of the following statements regarding frequency modulation is true except

amplitude of the modulated wave remains the same as that of carrier wave

the amount of variation of deviation from the original carrier frequency is determined by the frequency of the modulating signal

the rate at which the frequency of modulated wave varies is determined by the frequency of the modulating signal

frequency of modulated wave increases as the signal voltage increases and vice-versa

[#]

15.

Which of the following is not considered as a useful quantity in comparing noise performance of receivers?

Noise temperature

Noise figure

Noise resistance

Input noise voltage

[#]

16.

The communication satellite INSAT-IB had to take up the job of INSAT-IA because the latter collapsed within __________ months of its launch.

[#]

17.

Consider the following symbols

Letters A to Z and a to z
Digits 0 to 9
Logical operators and, or, not
Parenthesis ( )

Which of the above symbols are available in Pascal?

1 and 2 only

1, 2 and 3 only

1, 2 and 4 only

All

[#]

18.

Pick the odd one

variance

standard deviation

expectation

chebyshev inequality

[#]

19.

For the two-port network shown below, the short circuit admittance parameter matrix is

[#]

20.

In orthogonal BFSK. the energy of information bearing term is :

the same as total transmitted energy

one half of total transmitted energy

one fourth of total transmitted energy

None

[#]

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