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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The units for apparent power are watts.

True

False

[#]

The circuit in figure is switched on at t = 0. At any time t, i(t) =

3 + 3e^-1

6 - 3e^-1

3 - 3e^-t

6 - 6e^-1

[#]

A current 10 sin (200t) A flows through a 5 mH inductance. The expression for voltage is

10 sin (200t + 90°)

10 sin (200t - 90°)

10 sin(1000t + 90°)

10 sin (1000t - 90°)

[#]

In steady state condition inductor behave as

open circuit

short circuit

current source

voltage source

[#]

Thevenin's equivalent circuit

can be drawn only in time domain

can be drawn only in frequency domain

can be drawn both in time and frequency domain

can be drawn in frequency domain with some restrictions

[#]

A variable resistance R and capacitive reactance X_C are connected in series. As R is varied, the locus of Z is

a straight line parallel to Y axis in 4th quadrant

a straight line parallel to X axis in 4th quadrant

a straight line parallel to Y axis in second quadrant

a straight line parallel to Y axis in first quadrant

[#]

One volt equals

one joule

one joule/coulomb

one coulomb/joule

none of the above

[#]

In a modified series inverter with two inductors and two capacitors, the load current

has 2 parallel paths

has only one parallel path

can have three parallel paths

has four parallel paths

[#]

In figure, V_G =

2.22 V

22.2 V

0.22 V

0.022 V

[#]

10.

D FF can be used as a

differentiator

divider circuit

delay switch

none

[#]

11.

Assertion (A): Industrial robots improve productivity.

Reason (R): Robots can handle monotonous and complex jobs without error in operation.

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

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

A is correct but R is wrong

R is correct but A is wrong

[#]

12.

The main systems used for generation of SSB are

filter method

phase cancellation method

third method

all of the above

[#]

13.

Waves travel on each of the line configurations in figure. In which case would the radiation be maximum

[#]

14.

In the given figure power meters at A and B indicate 1 mW and 110 μW respectively. VSWR of line is

1.5

2.5

[#]

15.

E-mail can be used to send text, graphics, and video.

True

False

[#]

16.

Which of the following is invalid integer variable name in Fortran?

IAEG

I 124

AILG

MI AC

[#]

17.

Assertion (A): In 8085, the zero flag is set when ALU operation results in 0. If the result is not 0, this flag is reset.

Reason (R): In 8085 the S flag is set when the contents of accumulator become negative during execution of an instruction.

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

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

A is correct R is wrong

A is wrong R is correct

[#]

18.

Assertion (A): A two byte instruction of 8085 has an operation code in first byte and operand / address in the second byte.

Reason (R): If an instruction is too long it is possible to reduce its length by a number of methods.

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

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

A is correct R is wrong

A is wrong R is correct

[#]

19.

Consider the following statements

If ensemble and time averages of a random process are identical, the process is ergodic.
If ensemble and time average of a random process are not identical, the process is ergodic.
An ergodic process is stationary.
A stationary process is necessarily ergodic.

Which of the above statements are correct?

1 only

1 and 3 only

1, 3 and 4 only

1 and 4 only

[#]

20.

Using 4-bit numbers (n = 4) if k = (0011)₂ how is k expressed in 2's complement.

(1011)₂

(1101)₂

(1100)₂

(0101)₂

[#]

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