Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | In amplitude modulation |

A. | the amplitude of carrier varies in accordance with the amplitude of the modulating signal. [Wrong Answer] |

B. | the modulating frequency lies in the audio range [Correct Answer] |

C. | the amplitude of the carrier remains constant [Wrong Answer] |

D. | the amplitude of the carrier varies in accordance with the frequency of the modulating signal. [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ A 4 input AND gate is equivalent to

4 switches in parallel

2 switches in series and 2 in parallel

three switches in parallel and one in series

4 switches in series

⇒ Which of the following is not used as a microwave mixer or detector?

PIN diode

Crystal diode

Schottky barrier diode

Backward diode

⇒ In figure, the switch is initially open. At

*t*= 0 switch is closed.

*v*

_{c}(0

^{+}) and

*i*

_{L}(0

^{+})

60 V and - 0.3 A

150 V and zero

zero and 0.3 A

90 V and - 0.3 A

⇒ If sequence currents I

_{a1}= 2 ∠- 90°, I

_{a2}= 0.2 ∠ 90° and I

_{a3}= 1.8 ∠ 90°, I

_{a}=

0

1

4

8

⇒ In the case of the circuit shown in the figure V

_{io}= 10 mV dc maximum, the maximum possible output offset voltage V

_{oo}caused by the input offset voltage V

_{io}with respect to groun

60 mV dc

110 mV dc

130 mV dc

150 mV dc

⇒ In a CE transistor amplifier, when collector-emitter voltage increases

the instantaneous operating point moves up the load line

the instantaneous operating point moves down the line

load current increases

none of the above

⇒ If

*q*is charge on an electron, R is radius of electron orbit and ω is angular velocity of electron rotation, the magnetic dipole moment of electron in orbit is

0.5

*q*ωR

0.5

*q*

^{2}ω

^{2}R

^{2}

0.5

*q*ωR

^{2}

0.5

*q*ω

^{2}R

⇒ A two port network is said to be reciprocal if

*h*

_{12}= -

*h*

_{21}

AD - BC = 1

*y*

_{12}=

*y*

_{21}

all

⇒ A voltage doubler circuit uses

two diodes

two capacitors

two diodes and two capacitors

none of the above

⇒ The disturbance from adjacent power lines is known as

cross talk

cross fire

inductive disturbance

none of the above

⇒ A ship-to-ship communication system is plagued by fading. The best solution seems to be the use of

space diversity

frequency diversity

a broad band antenna

a more directional antenna

⇒ The unit of magnetic flux density is

farad/metre

ohm/metre

tesla

ampere/metre

⇒ In AM receiver the oscillator frequency is

always equal to signal frequency

always equal to 455 kHz

always higher than signal frequency

always lower than signal frequency

⇒ The time constant of the circuit after the switch shown in the figure is opene

0.2

*s*

5

*s*

0.1

*s*

dependent on R and hence cannot be determined unless R is known

⇒ A

*n*-type silicon sample contains a donor concentration of N

_{d}= 2 x 10

^{16}cm

^{-3}. The minority carrier hole lifetime is t

_{p0}= 5 μs. The thermal equilibrium generation rate of hole is:

1.125 x 10

^{9}cm

^{-3}s

^{-1}

0.625 x 10

^{9}cm

^{-3}s

^{-1}

4.5 x 10

^{9}cm

^{-3}s

^{-1}

2.25 x 10

^{9}cm

^{-3}s

^{-1}

⇒ Consider a Binary Symmetric Channel (BSC) with probability of error being

*p*. To transmit a bit, say 1, we transmit a sequence of three 1 s. The receiver will interpret the received sequence to represent 1 if at least two bits are 1. The probability that the transmitted bit will be received in error is

*p*

^{3}+ 3

*p*

^{2}(1 -

*p*)

*p*

^{3}

(1 -

*p*)

^{3}

*p*

^{3}+

*p*

^{2}(1 -

*p*)

⇒ Loading of a line means

increasing inductance of line

increasing distributed inductance of line

decreasing distributed inductance of line

decreasing inductance of line

⇒ A quantization error is an essential aspect of ADC

TRUE

FALSE

⇒ A potential of 7 V is applied to a silicon diode. A resistance of 1 K ohm is also in series with the diode. The current is

7 mA

6.3 mA

0.7 mA

0

⇒ PROM is

Permanent Read Only Memory

Polarized Read Only Memory

Positive Read Only Memory

Programmable Read Only Memory

⇒ In a series RLC circuit p.f is lagging when

*f*< resonance frequency.

TRUE

FALSE

⇒ Consider isotropic radiator radiating a power of 1 watt. At a distance of 1 metre, the power per unit area with equal

1 watt/m

^{2}

4p watt/m

^{2}

1/4p watt/m

^{2}

2p watt/m

^{2}

⇒ If

*e*= 10 cos (2p x 10

^{8}

*t*+ 20 cos 2p 10

^{3}

*t*). The bandwidth is

10

^{8}Hz

42 kHz

21 kHz

10

^{8}± 10

^{3}Hz

⇒ For the circuit, let us assume that R = 1 Ω, L = 10

^{-3}H, and V(t) = 10 cos (1000

*t*+ 30°)V and the differential equation for I(

*t*) is give

7.07 cos (1000

*t*+ 15°) A

70.7 cos (1000

*t*- 30°) A

7.07 cos (1000

*t*- 15°) A

7.07 cos (1000

*t*+ 15°) A

⇒ The input to negative clamper has a peak value of V

_{p}. Then in the output the positive and negative peaks are nearly

0 and -2 V respectively

V

_{p}and -V

_{p}respectively

2 V

_{p}and 0 respectively

none of the above

⇒ For a superconductor, the relative permeability is

zero

high

low

either low or high

⇒ In figure, the current through 10 V batter

0

0.5 A charging

0.5 A discharging

none of the above

⇒ A circuit is fed by two sources of the same frequency and values 100 ∠0° V and 20 ∠30°V. The current in a particular branch is 5 ∠19° A. If the magnitudes of the sources and changed to 200 ∠0° V and 40 ∠30° V, the current in that branch should be

5 ∠19° A

10 ∠19° A

10 ∠38° A

10 ∠9.5° A

⇒ In a megger the moving coil meter has a permanent magnet.

TRUE

FALSE

⇒ A function Z(

*s*) has zero at infinity if

the degree of numerator and denominator are equal

the numerator of Z(

*s*) is one degree higher than denominator

the denominator of Z(

*s*) is one degree higher than numerator

the degree of numerator and denominator are either equal or differ by one