Total number of questions : 20
Number of answered questions : 0
Number of unanswered questions : 20
Electronics and Communication Engineering [ Question No: 1 To 20 ] :
A 4 bit down counter starts counting from 1111 irrespective of modulus.
Your Answer : (Not Answered)
Correct Answer : B
The starting count depends on modulus. 4 bit decade down counter starts counting from 1010.
A mod 4 counter will count
Your Answer : (Not Answered)
Correct Answer : B
Mod 4 counter has 4 states, 0 to 3.
Quantization error occurs in
Your Answer : (Not Answered)
Correct Answer : B
Analog input can have any value but digital value can have only 2N discrete levels (for N bits). Hence quantization error in A/D conversion.
A first order system will never be able to give a __________ response
1.band stop
2.band pass
3.all pass
Choose the correct option
Your Answer : (Not Answered)
Correct Answer : C
Because to design band pass or band stop, transfer function of must be second order.
A voltage V(t) is a Gaussian ergodic random process with a mean of zero and a variance of 4 volt2. If it is measured by a dc meter. The reading will be
Your Answer : (Not Answered)
Correct Answer :
Induction heating systems require low frequency inverters.
Your Answer : (Not Answered)
Correct Answer : B
It uses high frequency inverter.
The average load current supplied by a thyristor depends on
Your Answer : (Not Answered)
Correct Answer : A
The firing angle controls the period of conduction and hence average load current.
A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90°, the speed is likely to be
Your Answer : (Not Answered)
Correct Answer : A
Average output voltage is reduced to 50% if a = 90°. Hence speed is also reduced to 50%.
The amount of dielectric heating is inversely proportional to frequency.
Your Answer : (Not Answered)
Correct Answer : B
It is proportional to frequency.
The geostationary communication satellite APPLE is parked in the equatorial orbit at
Your Answer : (Not Answered)
Correct Answer : A
No answer description available for this question.
If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiver
Your Answer : (Not Answered)
Correct Answer : D
No answer description available for this question.
In a radio receiver, if the intermediate frequency is too high
Your Answer : (Not Answered)
Correct Answer : A
No answer description available for this question.
In a second order undamped system, the poles are on
Your Answer : (Not Answered)
Correct Answer : B
If poles are on imaginary axis the response is undamped and oscillatory.
The polar plot of a transfer function passes through (-1, 0) point. The gain margin is
Your Answer : (Not Answered)
Correct Answer : A
When polar plot passes through (-1, 0) the system is on limit of stability and gain margin is zero.
The most commonly used bias in BJT amplifier circuits is
Your Answer : (Not Answered)
Correct Answer : A
Voltage divider bias stabilizes IC.
Which of these has a magnetic brake?
Your Answer : (Not Answered)
Correct Answer : B
Braking torque, in an energy meter, is provided by a magnet.
A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is
Your Answer : (Not Answered)
Correct Answer : A
.
In a specimen of ferromagnetic material, as the flux density is increased from zero to 2.5 T, µr will
Your Answer : (Not Answered)
Correct Answer : D
No answer description available for this question.
If n denotes principal quantum number, the angular quantum number l = 0, 1... (n - 1).
Your Answer : (Not Answered)
Correct Answer : A
Angular quantum number determines the angular momentum of electron.
In metals the valence electron wave functions are strongly perturbed by the presence of neighbouring atoms.
Your Answer : (Not Answered)
Correct Answer : A
In a metal valence electrons are shared by all atoms.