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Q1. | One eV = 1.602 x 10^{-19} joules. |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ For an amplifier the input output signals are shown in figure. The class of amplifie

A

AB

B

C

⇒ A 1000

*k*H

*z*carrier wave modulated 40% at 4000 H

*z*is applied to a resonant circuit tuned to a carrier frequency and having

*Q*= 140. What is the degree of modulation after passing the wave through this circuit?

0.4

0.2

0.27

0.554

⇒ The important postulate arising out of Maxwell's modification of Ampere's law is

a changing magnetic field produces an electric field

a changing electric field produces a magnetic field

a motional e.m.f. is produced by a coil moving in a magnetic field

a steady current produce a magnetic field

⇒ The impurity added to extrinsic semiconductor is of the order of

1 in 100

1 in 1000

1 in 100, 0000

1 in 100, 000, 000

⇒ A feedback amplifier has forward gains A

_{1}, A

_{2}and feedback factor β as shown in signal flow graph of the given figure. Because of feedback as shown in signal noise ratio at output

increase

decrease

be unaffected

depend on value of β

⇒ In the CMOS inverter

one transistor is N channel and the other P channel

one is enhancement type and other depletion type

both are N channel with one enhancement and the other depletion type

none

⇒ In a transistor CE mode, V

_{CC}= +30 V. If the transistor is in cut off region, V

_{CE}=

+30 V

+20 V

10 V

zero

⇒ In the television system in India, the odd and even fields are scanned

25 times each

25 times each but alternately

50 times each

50 times each but alternately

⇒ In the op-amp circuit of figure, V

_{03 V1 - 4 V2-3 V1 + 4 V23(V1 - V2)-3(V1 - V2)}

⇒ In a moving iron voltmeter the coil has a resistance of 20 Ω and an inductance of 0.3 H. The swamping resistance in 2000 Ω. To ensure correct reading with dc as well as 50 Hz ac, the value of capacitor to be connected in parallel with swamping resistance should be

0.0125 μF

0.0311 μF

0.0521 μF

0.0622 μF

⇒ A certain JK FF has

*t*= 12 n sec the largest MOD counter that can be constructed from these FF and still operate up to 10 MHz is

_{pd}any

8

256

10

⇒ In figure, V

_{CC}= + 30 V, R

_{1}= 200 kΩ and R

_{2}= 100 kΩ. If V

_{BE}= 0.7 V, the voltage a cross R

_{E+20 V+19.3 V+10 V+9.3 V}

⇒ The port of PC to which mouse is connected is called

serial port

parallel port

input port

scanner port

⇒ In a negative feedback amplifier A = 100, β = 0.04 and V

_{s}= 50 mV, then feedback will be

4

8

10

2

⇒

- Hall coefficient R
_{H}is directly proportional to the charge density - R
_{H}depends upon type of the semiconductor material (*n*- type or*p*- type) - Hall co-efficient R
_{H}is directly proportional to hall voltage V_{H}

I only

II only

III only

all of the above

⇒ An average responding rectifier type electronic voltmeter has its scale calibrated in terms of rms value of sine wave. If 100 V peak value square wave is fed to this voltmeter, the reading will be

111 V

100 V

90.9 V

70.7 V

⇒ Spot the odd one out

aluminium

silver

porcelain

copper

⇒ Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

TTL

CMOS

ECL

TTLLS

⇒ In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The rejection ratio at 25 MHz will be

1.116

1.386

2.116

2.386

⇒ A voltage wave

*v*= 10 + 20 sin ω

*t*+ 7.5 sin 3 ω(

*t*) is applied to a series combination of two elements. The current is

*i*= 5 sin (ω

*t*+ 20°) + 1.5 sin (3ω

*t*+ 10°). The elements are

R and C

R and L

L and C

both inductances

⇒ A dynamic RAM cell which holds 5 V has to be refreshed every 20 ms so that the stored voltage does not fall by more than 0.5 V. If the cell has a constant discharge current of 0.1 pA, the storage capacitance of cell is

4 x 10

^{-6}F

4 x 10

^{-9}F

4 x 10

^{-12}F

4 x 10

^{-15}F

⇒ In the network shown in figure, the voltage drops across R

_{2}and R

_{3}are 10 V and 16 V with polarities as shown. The current in R

_{1is 9 A and directed towards node 0is 9 A and directed away from node 0is 9 A but directed of current cannot be foundis impossible to be found}

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Digital counter | 1. | Measurement of harmonics |

B. | Schering Bridge | 2. | Measurement of frequency |

C. | Meggar | 3. | Measurement of loss angle of dielectric |

D. | Spectrum analyser | 4. | Measurement of insulation resistance |

A-1, B-2, C-3, D-4

A-4, B-3, C-2, D-1

A-2, B-3, C-4, D-1

A-4, B-1, C-3, D-2

⇒ In Pascal if I = 55, 10 * I div 10 =

55

50

5.5

5

⇒ Which of the following can be used to convert PPM into PWM?

Integrator

Astable multivibrator

Bistable multivibrator

Monostable multivibrator

⇒ A signal with ± 10 V ranged and 1 KHz band width is being digitized using a sample and hold circuit and a 10 bit quantizer. The quantization step is :

1 x 10

^{-9}V

5 x 10

^{-9}V

2.5 x 10

^{-9}V

0.5 x 10

^{-9}V

⇒ When the video signal is applied to the picture tube in a TV receiver, the strength of video signal is about

1000 V

200 V

50 V

1 V

⇒ Which of the following represents a stable system?

- Impulse response decreases exponentially.
- Area within the impulse response in finite.
- Eigen values of the system are positive and real.
- Roots of the characteristic equation of the system are real and positive.

1 and 4

1 and 3

2, 3 and 4

1, 2

⇒ The voltage drop per ampere-metre of an aluminium conductor is higher as compared to a copper conductor of the same size due to its higher

insulation resistance

resistivity

conductivity

current density

⇒ A microstrip line has dielectric having relative permittivity ∈

*. The effective dielectric constant is*

_{r}more than ∈

_{r}equal to 1

less than ∈

_{r}either

*a*or

*b*