Total number of questions : 20
Number of answered questions : 0
Number of unanswered questions : 20
Electronics and Communication Engineering [ Question No: 1 To 20 ] :
For the binary number 11101000, the equivalent hexadecimal number is
Your Answer : (Not Answered)
Correct Answer : D
11 01000 = 128 + 64 + 32 + 8 = 232 in decimal = E 8 in hexadecimal.
Zero suppression is not used in actual practice.
Your Answer : (Not Answered)
Correct Answer : B
Zero suppression is commonly used.
The resolution of an n bit DAC with a maximum input of 5 V is 5 mV. The value of n is
Your Answer : (Not Answered)
Correct Answer : C
No Explanation.
A geosynchronous satellite
Your Answer : (Not Answered)
Correct Answer : D
No answer description available for this question.
A 20 m antenna gives a certain uplink gain at frequencies of 4/6 GHz. For getting same gain in the 20/30 GHz band, antenna size required is metre.
Your Answer : (Not Answered)
Correct Answer : B
No answer description available for this question.
The typical squelch circuit
Your Answer : (Not Answered)
Correct Answer : C
No answer description available for this question.
In control systems the magnitude of error voltage
Your Answer : (Not Answered)
Correct Answer : A
The error voltage is always very small. A high value of error voltage may cause instability.
The M circle for M = 1 is the
Your Answer : (Not Answered)
Correct Answer : A
No answer description available for this question.
An oscillator requires an amplifier
Your Answer : (Not Answered)
Correct Answer : B
Positive feedback is necessary for sustained oscillations.
For high frequencies a capacitor like
Your Answer : (Not Answered)
Correct Answer : B
. If w is very high, XC, is nearly zero.
A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10 nF capacitor in the second branch. At resonance frequency is
Your Answer : (Not Answered)
Correct Answer : C
= 
= 44.67 x 104 rad/sec.
A sinusoidal voltage has peak to peak value of 100 V. The rms value is
Your Answer : (Not Answered)
Correct Answer : C
Peak value = 50 V, rms value = 
= 35.35 V.
The dimensions of EMF are
Your Answer : (Not Answered)
Correct Answer : A
EMF = workdone/charge.
A moving coil instrument has a resistance of 0.5 Ω and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt resistance should be
Your Answer : (Not Answered)
Correct Answer : B
.
In an R-C series circuit excited by a voltage E, the charge across capacitor at t = 0+ is
Your Answer : (Not Answered)
Correct Answer : A
Voltage across a capacitor cannot change instantaneously.
In carbon resistor colour code, the third band is red. It indicates
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Correct Answer : A
No answer description available for this question.
If a piece of wood is placed in a magnetic field
Your Answer : (Not Answered)
Correct Answer : A
Wood is non-magnetic.
Assertion (A): Power loss in a conductor of resistance P = I2R.
Reason (R): When a conductor is carrying current with current density J as a result of applied field E, then heat developed/m3/ second = JE.
Your Answer : (Not Answered)
Correct Answer : A
Heat developed depends an power loss.
There is no hysteresis phenomenon is any dielectric material.
Your Answer : (Not Answered)
Correct Answer : B
Hysteresis phenomenon exists in dielectic materials.
Assertion (A): Magnetic susceptibility of diamagnetic materials is much less than that of paramagnetic materials.
Reason (R): For diamagnetic as well as paramagnetic materials, μr is nearly equal to 1.
Your Answer : (Not Answered)
Correct Answer : A
Magnetic susceptibility = (μr - 1)H.
For diamagnetic and paramagnetic materials magnetic susceptibility is very very small and μr = 1.