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 a varactor diode the increase in width of depletion layer results in |

A. | decrease in capacitance [Correct Answer] |

B. | increase in capacitance [Wrong Answer] |

C. | no change in capacitance [Wrong Answer] |

D. | either (a) or (b) [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ For a good conducting medium the intrinsic impedance is

σωμ ∠p/2

ωμ /σ ∠45°

ωμ/σ ∠p/2

ωμ/σ ∠0°

⇒ In the given figure the reflection coefficient at source en

1

-1

42738

-1/3

⇒ An antenna is 30 metre high. The frequency is 1 MHz. The radiation resistance is about

1500 Ω

150 Ω

15 Ω

1.5 Ω

⇒ Which has volatile memory?

Magnetic tape

RAM

Diskette

Hard disk

⇒ In a purely inductive circuit, the current __________ the voltage by __________ .

lags, 0°

leads, 90°

lags, 90°

lags, 45°

⇒ The oscillator shown in figure

Clapp oscillator

R-C Phase shift oscillator

Hartley oscillator

Colpitt's oscillator

⇒ A lossless 50 Ω transmission line is terminated 30 +

*j*25 Ω, then voltage reflection coefficient and current reflection coefficient are

062 ∠82.88, - 0.62 ∠82.88

10.36 ∠11.296, - 10.36 ∠111.296

0.23 ∠49.1, - 0.23 ∠ + 49.1

- 10.36 ∠111.296, 10.36 ∠111.296

⇒ The current distribution of a half wave dipole is

uniform

sinusoidal

triangular

complex

⇒ The probability of recombination of electrons and holes in a semiconductor is proportional to

density of electrons

density of holes

density of electrons and holes

none of the above

⇒ In figure, the function of resistor

to reduce ripples in the output

to improve voltage regulation

to limit the surge current

either (a) or (c)

⇒ Consider the following statements regarding phase sensitive detector

- The detector reads zero when phases of input signal and reference signal are different.
- The detector acts as a linear rectifier.
- The detector can be used as vector voltmeter.

1, 2, 3

1 and 2

2 and 3

1 and 3

⇒ A low-pass filter frequency responce H (

*j*ω) = A (ω)

*e*

^{jΦ}(ω) does not produce any phase distortion, if

A(ω) = Cω

^{2}, Φ (ω) =

*k*ω

^{3}

A(ω) = Cω

^{2}, Φ (ω) =

*k*ω

A(ω) = Cω

^{2}, Φ (ω) =

*k*ω

^{2}

A(ω) = C, Φ (ω) =

*k*ω

^{-1}

⇒ A pair of 21114s can store __________ words of __________ bits each.

2114, 8

1024, 8

4228, 16

2114, 16

⇒ In a JFET V

_{DS}exceeds the rated value. Then it operates in

active region

ohmic region

cut off region

either cut off or active region

⇒ A 120 V, 30 Hz source feeds a half wave rectifier circuit through a 4 : 1 step down transformer, the average output voltage is

30 V

13.5 V

10 V

7.07 V

⇒ As compared to a

*p*-

*n*junction diode

a schottky diode has lower cut in voltage and lower reverse saturation current

a schottky diode has higher cut in voltage and higher reverse saturation current

a Schottky diode has lower cut in voltage and higher reverse saturation current

a schottky diode has higher cut in voltage and lower reverse saturation current

⇒ A collector collects

electrons from the base in case of N-P-N transistor

electrons from the emitter in case P-N-P transistor

holes from the base in case of N-P-N transistor

holes from the base in case of P-N-P transistor

⇒ Zero bias works only with

D MOSFETs

E MOSFETs

both D and E MOSFETs

neither D nor E MOSFETs

⇒ For a periodic waveform, the power spectral density and correlation function form

a Laplace transform pair

a Fourier transform pair

either (a) or (b)

neither (a) nor (b)

⇒ An electron in a homogeneous magnetic field and having velocity perpendicular to the direction of field moves

perpendicular to the field

along the field

along a straight line inclined at 45° to field

in a circular path

⇒ An instruction used to set cany flag in a computer is classified as

data transfer

arithmetic

logical

program control

⇒ A memory system of size 16 k bytes is to be designed using memory chips which have 12 address lines and 4 data lines each. The number of such chips required to design the memory system is

2

4

8

18

⇒ What is the decimal equivalent of the binary number shown in fourth row?

79

97

117

127

⇒

**Assertion (A):** In control system velocity error is not an error in velocity but is an error in position due to a ramp input.

**Reason (R):** For a type of system velocity error is zero.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

R is correct but A is wrong

⇒ Data can be changed from spatial code to temporal code and vice-versa by using

ADC and DAC

shift Register

synchronous counter

timers

⇒ Two passive elements are connected in series and a dc voltage is applied to the circuit. The time variation of the current is shown in figure. The two elements

one resistance and the other inductance

both resistances

one inductance and the other capacitance

one resistance and the other capacitance

⇒ The output

*y*(

*t*) of a linear time invariant system is related to its input

*x*(

*t*) by the following equation

*y*(

*t*) = 0.5

*x*(

*t*-

*t*

*+ 1) +*

_{d}*x*(

*t*-

*t*

*) + 0.5*

_{d}*x*(

*t*-

*t*

*+ 7). The filter transfer function*

_{d}*H*(ω) of such a system is given by

(1 + cos ωt)

*e*

^{-jωt}

*d*

(1 + 0.5 cos ωt)

*e*

^{-jωt}

*d*

(1 + cos ωt)

*e*

^{jωt}

*d*

(1 - 0.5 cos ωt)

*e*

^{-jωt}

*d*

⇒ A transmission line has primary constants R, L, G and C and secondary constant

*z*

_{0}and γ = (a + Jβ). If the line is loss less, then

R = 0, G ≠ 0, and a = 0

R = 0, G = a, 0 and β = |r|

G = 0, a = β

R = 0, G = 0, a = 0, β = |r|

⇒ CMRR of an op-amp is about 0.1.

TRUE

FALSE

⇒ The Nyquist plo

will start from (ω = ∞) in the first quadrant and will terminate (ω = 0) in the second quadrant

will start from (ω = ∞) in the fourth quadrant and will terminate (ω = 0) in the second quadrant

will start form (ω = ∞) in the second quadrant and will terminate (ω = 0) in the fourth quadrant

will start from (ω = ∞) in the first quadrant and will terminate (ω = 0) in the fourth quadrant