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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.
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  • 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 kinetic energy of free electrons in a metal is (where k is de-Broglie wave number of the electrons)
∝
∝
μk
μk2
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Correct Answer: Option
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Learn more problems on : Electronic Devices and Circuits
2.
An RLC series circuit has R = 8 Ω, XL = 8 Ω and XC = 8 Ω Its impedance is
8 + j 16 Ω
8 + j 8 Ω
8 Ω
24 Ω
Your Answer: Option
(Not Answered)
Correct Answer: Option
Explanation:

Z = 8 + j(8 - 8).

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Learn more problems on : Networks Analysis and Synthesis
3.
The realization of the term Ks yields
a resistance of value K ohms
a capacitances of value K farads
an inductance of value k farads
either (b) or (c)
Your Answer: Option
(Not Answered)
Correct Answer: Option
Explanation:

Impedance of inductance K is sK.

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4.
For a given line voltage, four heating coils will produce maximum heat when connected
all in parallel
all in series
with two parallel pairs in series
one pair in parallel with the other two in series
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5.
In drawing phasor diagrams, RMS values are used.
True
False
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6.
The double energy transients occur in the
pure inductive coil
R-L circuit
R-C circuit
R-L-C circuit
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7.
For the same length of arrays, half power beam-width of binomial array
is equal to that of uniform arrays
is less than that of uniform array
is more than that of uniform array
is negligible as compared to that of uniform array
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Learn more problems on : Electromagnetic Field Theory
8.
Power gain and directivity related with, Gp power gain, Gd directive gain
Gp = η Gd
Gd = η Gp
Gp = η Gd2
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Learn more problems on : Electromagnetic Field Theory
9.
As compared to a p-n junction diode
a schottky diode has lower cut in voltage and lower reverse saturation current
a schottky diode has higher cut in voltage and higher reverse saturation current
a Schottky diode has lower cut in voltage and higher reverse saturation current
a schottky diode has higher cut in voltage and lower reverse saturation current
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Learn more problems on : Power Electronics
10.
The most common method for biasing a JFET is
reverse bias
self bias
voltage divider bias
none of the above
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Learn more problems on : Analog Electronics
11.
For operation of enhancement only N-channel MOSFET, value of gate voltage has to be
zero
low positive
high negative
high positive
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12.

Assertion (A): A high density IC has more diodes, transistors and resistors per unit surface area.

Reason (R): A high density IC can handle high voltages.

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 true, R is false
A is false, R is true
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Learn more problems on : Digital Electronics
13.
High speed counter
ring counter
ripple counter
synchronous counter
asynchronous counter
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Learn more problems on : Digital Electronics
14.
A superheterodyne receiver is to operate in the frequency range 550 kHz - 1650 kHz, with the intermediate frequency of 450 kHz. Let denote the required capacitance ratio of the local oscillator and I denote the image frequency (in kHz) of the incoming signal. If the receiver is tuned to 700 kHz, then
R = 4.41 J =1600
R = 2.10 J =1150
R = 3.0 J =1600
R = 9.0 J =1150
Your Answer: Option
(Not Answered)
Correct Answer: Option
Explanation:

Image frequency = 700 + 2 x 450 1600 kHz

fmax = 1650 + 450 2100 kHz

fmin = 550 kHz + 450 1000 kHz

R = 4.41, I = 1600 kHz.

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Learn more problems on : Communication Systems
15.
Which one of the following is correct?
Coding reduces the noise in the signal
Coding deliberately introduces redundancy into messages
Coding increases the information rate
Coding increases the channel bandwidth
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Learn more problems on : Communication Systems
16.
Consider the following statements as regards pulse repetition frequency
  1. Pulse interval should be as large as possible so that a pulse returns before next pulse is transmitted
  2. Greater the number of pulses reflected from a target, greater is the probability of distinguishing it from the noise
Which of the above are correct?
1 only
2 only
both 1 and 2
neither 1 nor 2
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Learn more problems on : Communication Systems
17.
Slotted line can be used for measurement of high frequencies
True
False
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Learn more problems on : Microwave Communication
18.
In a rectangular waveguide cutoff wavelength for TE10 mode is 8 cm. Then cutoff wavelength for TE20 mode is
8 cm
6 cm
4 cm
2 cm
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Learn more problems on : Microwave Communication
19.
In windows the middle button of mouse is not used.
True
False
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Learn more problems on : Microprocessors
20.
The feedback control system shown in figure is stable.
for all K ≥ 0
only if K ≥ 1
only if 0 ≤ K < 1
only if -1 ≤ K < 1
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Learn more problems on : Exam Questions Papers
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