IndiaBIX

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

Instruction:
  • This is a FREE online test. Beware of scammers who ask for money to attend this test.
  • Total number of questions: 20.
  • Time allotted: 30 minutes.
  • Each question carries 1 mark; there are no negative marks.
  • DO NOT refresh the page.
  • All the best!

Marks : 2/20

Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.
1.
The maximum rectification efficiency in case of full wave rectifier is
100%
81.2%
66.6%
40.6%
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Electronic Devices and Circuits
2.
The material which has zero temperature coefficient of resistance is
manganin
porcelain
carbon
aluminium
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Electronic Devices and Circuits
3.
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?
Dust particles may not accumulate
Charge per unit area becomes very high for lightening to discharge
Rain drops may not collect
None of the above
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Electromagnetic Field Theory
4.
A quiescent state of a transistor implies
zero bias
no output
no distortion
no input signal
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Analog Electronics
5.
A cascade amplifier stage is equivalent to
common emitter stage followed by a common base stage
common base stage followed by an emitter follower
an emitter follower stage followed by a common base stage
a common base stage followed by a common emitter stage
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Analog Electronics
6.
The number of logic devices required in a Mod-16 synchronous counter are
4
5
6
7
Your Answer: Option
(Not Answered)
Correct Answer: Option
Explanation:

4 flip-flops and 2 AND gates.

Discuss about this problem : Discuss in Forum
Learn more problems on : Digital Electronics
7.
figure shows three pulse train inputs to a 3-input AND gate. Assuming positive logic, the output signal obtained in figure would be
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Digital Electronics
8.
Binary 1000 multiplied by binary 1000 gives
10000
100000
1000000
10000000
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Digital Electronics
9.
In a 4 bit D/A converter, the offset error is the output voltage when input digital voltage is
1111
0000
either 1111 or 0000
none of the above
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Digital Electronics
10.
If Z is the number of zeros of 1 + G(s) H(s) in the right half s plane. N is the number of clockwise encircle elements of (-1 + jo) point. P is the number of poles of G(s) H(s) in right half s plane. The Nyquist stability criterion can be expressed as
Z = N + P
Z = P/N
Z = N - P
Z = PN
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Automatic Control Systems
11.
Which of the following statement regarding single-sideband (SSB) transmission is not correct?
In such transmission only or sideband is transmitted, leaving of the other sideband and the carrier
It has gained general acceptance of use in home-entertainment equipment
It is generally reserved for point-to-point communication
The amount of power and bandwidth necessary to be transmitted for a given amount of information are appreciable reduced
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Communication Systems
12.
In a radar, the return echo arrives after the allocated pulse interval. Then
the receiver may be over loaded
the target will appear closer than its actual position
the return echo may interfere with transmitter operation
none of the above
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Communication Systems
13.
Noise limiter is provided on AM receivers to
reduce interfering noise due to ignition system
reduce noise due to electrical storms
reduce interference due to electrical machinery
all of the above
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Radio Receivers
14.
To ensure that only dominant mode TE10 is allowed to propagate in an air filled rectangular waveguide, the lower frequency limit and upper frequency limit are
about 25% above fc for TE10 and 5% below fc for TE20 mode respectively
about 50% above fc for TE10 and 25% below fc for TE20 mode respectively
about 25% above fc for TE10 and 25% below fc for TE20 mode respectively
none of the above
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Microwave Communication
15.
Which of the following identifiers is valid in Pascal?
THETA
NUM
1 ST
$ BETA
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Microprocessors
16.
Auto correlation R(t) of a function v(t) is defined as
noe of these
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Signals and Systems
17.

Match the following:

List I (Symbol in Java comparison operator) List II (Meaning)
A.= =1.Greater than or equal to
B.! =2.Equal
C.> =3.Not equal

A-1, B-2, C-3
A-3, B-2, C-1
A-1, B-3, C-2
A-2, B-3, C-1
Your Answer: Option
(Not Answered)
Correct Answer: Option
Discuss about this problem : Discuss in Forum
Learn more problems on : Matching Questions
18.
In the derivation of expression for peak percent overshoot, , Which one the following conditions is NOT required?
System is linear and time invariant
The system transfer function has a pair of complex conjugate poles and no zeros.
There is no transportation delay in the system.
The system has zero initial conditions.
Your Answer: Option
(Not Answered)
Correct Answer: Option
Explanation:

.

Discuss about this problem : Discuss in Forum
Learn more problems on : Exam Questions Papers
19.
In the following circuit, the switch S is closed at t = 0 The rate of change of current (0 +) is given by
0
∞
Your Answer: Option
(Not Answered)
Correct Answer: Option
Explanation:

At t = 0, inductor acts like a open circuit.

We know at t = 0+, inductor path is open circuit

V = Is.Rs (at t = 0+)

Thus

Discuss about this problem : Discuss in Forum
Learn more problems on : Exam Questions Papers
20.
If h1[n] = 3δ[n] + δ[n - 1], h2[n] = 2δ[n] + δ[n - 2]
h3[n] = δ[n] - 3δ[n - 1] + 7δ[n - 4] + 6δ[n - 6]
h[n] = h1[n] * h2[n] + h3[n] * h1[n] has value
{6, 18, 7, 4, 0, - 6, 9}
{9, 0, - 6, 21, 7, 6, 1}
{7, - 1, 3, 1, 7, 0, 6}
{9, - 6, 0, 1, 21, 7, 18, 6}
Your Answer: Option
(Not Answered)
Correct Answer: Option
Explanation:

h1[n] * h2[n] + h3[n] * h1[n] = h1[n] * (h2[n] + h3[n])

Distributive property for convolution,

(h2[n] + h3[n]) = 3δ(n) - 3δ(n - 1) + δ(n - 2) + 7δ(n -4) + 6δ(n - 6) then h1(n) * (h2(n) + h3(n))

{9, - 6, 0, 1, 21, 7, 18, 6}.

Discuss about this problem : Discuss in Forum
Learn more problems on : Exam Questions Papers
*** END OF THE TEST ***
Time Left: 00:29:56
Post your test result / feedback here:

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers