Total number of questions : 20
Number of answered questions : 0
Number of unanswered questions : 20
Electronics and Communication Engineering [ Question No: 1 To 20 ] :
Decimal -90 equals __________ in 8 bit 2s complement
Your Answer : (Not Answered)
Correct Answer : B
+90 in binary is 01011010. Its 2's complement is 10100110.
ECL has high switching speed because the transistors are
Your Answer : (Not Answered)
Correct Answer : B
High speed is obtained because saturation state is avoided.
A Karnaugh map with 4 variables has
Your Answer : (Not Answered)
Correct Answer : D
No Explanation.
Assertion (A): A demultiplexer can be used as a decoder.
Reason (R): A demultiplexer can be built by using AND gates only.
Your Answer : (Not Answered)
Correct Answer : C
Demultiplexer requires NOT gates also in addition to AND gates.
Zero suppression is not used in actual practice.
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Correct Answer : B
Zero suppression is commonly used.
The rated current of a thyristor is 40 A. The holding current will be about :
Your Answer : (Not Answered)
Correct Answer : D
The holding current is much less then 1% of rated current.
In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle a is
Your Answer : (Not Answered)
Correct Answer : B
Since output voltage is zero if a ≥ 150°, the possible range of firing angles is 0 ≤ a ≤ 150°.
Thyristors are not suitable for logic circuits.
Your Answer : (Not Answered)
Correct Answer : B
Thyristors can be used for logic circuits.
Point out the false statement.
Launching of geostationary experimental communication satellite has helped India to gain experience in
Your Answer : (Not Answered)
Correct Answer : C
No answer description available for this question.
The different access methods which permit many satellite users to operate in parallel through a single transponder without interfering with each other as
Your Answer : (Not Answered)
Correct Answer : D
No answer description available for this question.
Which of the following statement about receivers is false?
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Correct Answer : D
No answer description available for this question.
Which of the following cannot be used to demodulate SSB?
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Correct Answer : D
No answer description available for this question.
The effect of negative feedback on distortion and bandwidth because
Your Answer : (Not Answered)
Correct Answer : C
Negative feedback increase bandwidth and reduces distortion.
If the Nyquist plot does not encircle the (-1 + j0) point the system is always stable.
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Correct Answer : B
It is not necessary.
The constant magnitude of G(s) plane are
Your Answer : (Not Answered)
Correct Answer : D
No answer description available for this question.
The dc load current in a bridge rectifier circuit is 10 mA. The dc load current through each diode is
Your Answer : (Not Answered)
Correct Answer : D
Since both diodes contribute equal load current, each diode current is 5 mA.
The open loop gain of an actual op-amp is about 100.
Your Answer : (Not Answered)
Correct Answer : B
It is very high.
The scale of hot wire instrument is linear.
Your Answer : (Not Answered)
Correct Answer : B
Since reading is proportional to I2, the scale is non-linear.
An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is
Your Answer : (Not Answered)
Correct Answer : C
Final output = 2 x 10-3 x 250 = 0.5 V.
.
Assertion (A): CO2 has no resultant dipole moment but CO has a dipole moment.
Reason (R): The structure of CO2 is O = C = O.
Your Answer : (Not Answered)
Correct Answer : A
No answer description available for this question.