Online Electronics and Communication Engineering Test - Electronics and Communication Engineering Test - Random
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- 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.
If B = 4 + j3, (B)1/3 =
Your Answer: Option
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Correct Answer: Option
Explanation:
4 + j3 = 5∠36.87°
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2.
Kirchoff's laws are applicable to
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3.
If wave of critical frequency 30 MHz is departing at an angle of 60°, then the MUF is given to be
Your Answer: Option
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Correct Answer: Option
Explanation:
MUF = fc sec θ
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4.
The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be
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Explanation:
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5.
In a half bridge inverter each thyristor is gated at a frequency f. The output frequency is
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6.
Ultra high frequency oscillators work in the range
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7.
The voltage gains of an amplifier without feedback and with negative feedback respectively are 100 and 20. The percentage of negative feedback would be.
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8.
If 4 in binary system is 100 then 8 will be
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9.
Consider the following statements about loop antenna
- It is suitable for direction finding application
- It is a single turn or multiturn coil carrying RF current
- The loop is surrounded by a magnetic field everywhere perpendicular to the loop
Your Answer: Option
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Correct Answer: Option
Explanation:
All the three are correct.
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10.
If a line is terminated in characteristic impedance Z0, the input impedance measured at the input will be
Your Answer: Option
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Correct Answer: Option
Explanation:
If line is terminated in Z0, the input impedance is Z0.
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11.
A device with input x(t) and y(t) is characterized by y(t) = x2(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is
Your Answer: Option
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Correct Answer: Option
Explanation:
If we square the signal, bandwidth will becomes double.
B.W. for x(t) = 2(90 + 5) = 190 kHz
for x2(t) = 2 x 190 380 kHz.
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12.
The modulation index of a narrowband FM signal is
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13.
An image uses 512 x 512 picture elements. Each element can take any of eight distinguishable levels. The maximum entropy in the above image will be
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14.
In an FM signal, the power
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15.
Which of the following real expressions is correct in Pascal?
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Explanation:
All others are incorrect.
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16.
The number of registers and flags in 8086 are
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17.
In 8085, high level on INTR line can be recognised only if
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18.
Given L[f(t)] =
and L[g(t)] =
also h(t) =
, where, x =
then, L[h(t)] = __________ .




Your Answer: Option
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Correct Answer: Option
Explanation:
Now, x =
∴ log x = ejp x log S log x = y,
x = ey
log x = log Sejp
x = Sejp
x = S-1
∴
∴
∴ L[f(t)] = L[f(t)] x L[g(t)].
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19.
The electric field of 2.5 x 107 V/m can give 1 eV energy to condition electron, then in a copper block what will be the mean free path of electron?
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Correct Answer: Option
Explanation:
The force on electron in eE. As the electron moves through distance d , the work done on it is eEd.
This is equal to energy transferred to electron.
∴ eEd = 1 eV
∴ d = 4 x 10-7m.
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20.
Which one of the following is used as the interface chip for data transmission between 8086 and a 16-bit ADC?
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