Electronics and Communication Engineering [ Question No: 1 To 20 ] :
1.
A 6 bit R-2R ladder D/A converter has a reference voltage of 6.5 V. It meets standard linearity then resolution in percent and volts.
Your Answer : (Not Answered)
Correct Answer : D
Explanation:
No Explanation.
2.
The number FF in hexadecimal system is equivalent to number __________ in decimal system.
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
FF = 15 x 16 + 15 = 255.
3.
Karnaugh map can not be drawn when the number of variables is more than 4
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
K map can be drawn for more than 4 variables.
4.
The F.T. of a conjugate symmetric function is always
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
F.T. of conjugate symmetric function is always real.
5.
A static induction thyristor
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
It can be turned on by positive gate pulse and turned off by negative gate pulse. It is minority carrier device. It can be manufactured in high current and high voltage ratings and its on state voltage drops is low.
6.
The dynamic equalising circuit consists of a series combination of capacitor C and resistor RC across each thyristor. This resistance RC (along with parallel connected diode)
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
Discharge current flows through Re .
7.
The amount of dielectric heating is inversely proportional to frequency.
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
It is proportional to frequency.
8.
The most effective anti jamming technique is
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
No answer description available for this question.
9.
The angle subtended by earth at geostationary communication satellite is
Your Answer : (Not Answered)
Correct Answer : A
Explanation:
No answer description available for this question.
10.
In a minimum phase system
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
For stability poles must be in left half plane. Zeros in left half plane lead to minimum phase shift.
11.
Your Answer : (Not Answered)
Correct Answer : D
Explanation:
When input pulses are applied, the motor moves in steps.
12.
Assertion (A): Potentiometers can not be used as error detectors in position control systems.
Reason (R): The resolution of a potentiometer places an upper limit on its accuracy
Your Answer : (Not Answered)
Correct Answer : D
Explanation:
Potentiometers are used as error detectors.
13.
Feedback factor may be less or more than 1.
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
Feedback factor is much less than 1.
14.
An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
When a sinusoidal voltage is clipped on both sides it resembles a square wave.
15.
An accelerometer has a seismic mass of 0.05 kg and spring constant of 3 x 105 N/m. If maximum displacement of mass is ± 1 mm, the maximum acceleration which can be measured is
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
0.05 x a = 3 x 103 x 10-3 or a = 60 m/s2.
16.
A dynamometer wattmeter is connected in ac circuit. The measured power is
Your Answer : (Not Answered)
Correct Answer : B
Explanation:
All wattmeters measure average power over a cycle.
17.
Z(c) for the network shown in the figure is 
The value of C and R are, respectively
Your Answer : (Not Answered)
Correct Answer : A
Explanation:
No answer description available for this question.
18.
Assertion (A): For elemental dielectrics, P = NaeEi where N is number of atoms/m3, P is polarization, ae is electronic polarization and Ei is internal electric field.
Reason (R): In elemental dielectrics there are no permanent dipoles or ions.
Your Answer : (Not Answered)
Correct Answer : A
Explanation:
In elemental dielectrics Pi = Po = 0.
19.
As the temperature of a pure silicon specimen is increased
Your Answer : (Not Answered)
Correct Answer : D
Explanation:
No answer description available for this question.
20.
In intrinsic semiconductors, the number of free electrons is equal to the number of mobile holes.
Your Answer : (Not Answered)
Correct Answer : A
Explanation:
No answer description available for this question.