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Q1. | The band gap of silicon at 300K is |

A. | 1.36 eV [Wrong Answer] |

B. | 1.10 eV [Correct Answer] |

C. | 0.80 eV [Wrong Answer] |

D. | 0.67 eV [Wrong Answer] |

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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 :**

⇒ Consider the following features of an instrument

- suitable for both ac and dc
- free from hysteresis and eddy current errors
- No waveform and frequency errors
- it is essentially a voltmeter

moving iron

moving coil

electrostatic

dynamometer

⇒

**Assertion (A):** A transducer needs an output measuring or display device for measuring a non electrical quantity.

**Reason (R):** In some transducers the output voltage is too small and needs amplification before it can be measured.

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

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

A is true R is false

A is false R is true

⇒ Logic hardware is available only in NAND and NOR.

TRUE

FALSE

⇒ Consider the following statements :

- Tellegen's theorem is applicable to any lumped networks.
- The reciprocity theorem is applicable to linear bilateral networks.
- Thevenin's theorem is applicable to two- terminal linear active networks.
- Norton's theorem is applicable to two-terminal linear active networks.

1, 2, and 3

1, 2 and 4

1, 2, 3 and 4

3 and 4

⇒ If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be

a voltage source

a current source

both of the above

none of the above

⇒

**Assertion (A):** The small signal analysis of a transistor amplifier is done to obtain the current gain, voltage gain and the conversion efficiency of an amplifier.

**Reason (R):** The small signal analysis of a transistor amplifier uses the small signal parameters of the transistor.

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

⇒ Which of these are universal gates?

Only NOR

Only NAND

Both NOR and NAND

NOR, NAND, OR

⇒ A constant

*k*low pass filter has

*f*

_{c}= 500 Hz. At

*f*= 1000 Hz, the attenuation is

zero

infinity

may be zero or infinity

more than zero but less than infinity

⇒ Algebraic expression for

*z*-transform of

*x*[

*n*] is X[

*z*]... What is the algebraic expression of

*z*-transform of

*e*

^{jω0n}

*x*[

*n*]?

X(Z - Z

_{0})

X(

*e*

^{-jW0z})

X(

*e*

^{jω0z})

X(Z)

^{jω0z}

⇒ In carbon resistor colour code, the third band is red. It indicates

two zeros

three zeros

multiplier is 0.01

multiplier is 0.1

⇒ If φ

_{sh}is flux of shunt magnet, φ

_{se}is flux of series magnet, i

_{sh}is eddy current due to φ

_{se}, the torque in an induction wattmeter is proportional to

φ

_{se}i

_{se}+ φ

_{sh}i

_{sh}

φ

_{sh}i

_{se}- φ

_{se}i

_{sh}

φ

_{sh}i

_{sh}- φ

_{se}i

_{se}

φ

_{sh}i

_{sh}+ φ

_{se}i

_{se}

⇒ Which of the following statement is false?

Bandwidth of a circuit is given by the range of frequencies lying between half-power points

Half-power points on a resonance curve are those points where power is half of that at resonance

Half-power points are also known as 3

*d*B points

At both half-power points, the p.f. = 0.707 lagging

⇒ Consider the following statements:

- If any root of characteristic equation has a positive real part the impulse response is unbounded and system is unstable.
- If all the roots of a characteristic equation have negative real parts, the impulse response decays to zero.
- If one or more non-repeated roots of characteristic equation are on
*j*ω axis impulse response is bounded but the system is unstable.

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

⇒ Distances near the skip distance should be used for sky-wave propagation

to avoid the Faraday effect

to avoid tilting

to prevent sky-wave and upper ray interference

so as to exceed the critical frequency

⇒ An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances are

40 kΩ and 8 kΩ respectively

4 kΩ and 80 kΩ respectively

0.4 kΩ and 800 kΩ respectively

8 kΩ and 160 kΩ respectively

⇒ The ground waves eventually disappear as one moves away from the transmitter because of

tilting

maximum single-hop distance limitation

interference from the sky waves

loss of line-of sight condition

⇒ In 8086

the registers SI and DI are used for string operation

the registers CS and DS are used for string operation

the registers SS and ES are used for string operation

the registers SI and SP are used for string operation

⇒ The rated current of a thyristor is 40 A. The holding current will be about :

20 A

0.0416666666666667

100 mA

10 mA

⇒ F = ∑(0, 3, 4, 5, 7) =

[B ⊕ C] + AC

B'C' + BC + AC

AB + BC + CA

None

⇒

Match the following:

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

A. | D Layer | 1. | 110 km |

B. | E layer | 2. | 10 km |

C. | F layer | 3. | 60 km |

D. | Troposphere | 4. | 350 km |

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

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

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

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

⇒ The modulation of effective base width by collector voltage is known as Early effect, hence reverse collector voltage

increases both a and β

decrease both a and β

increase a but decrease β

decrease a but increase β

⇒ In a number system with radix

*r*, the decimal value of 110 is equal to 4

*r*. The decimal values of 111 and

*r*respective are equal to

20, 5

16, 4

13, 3

8, 2

⇒ The signal defined by the equations

*f*(

*t*) = 0 for

*t*< 0,

*f*(

*t*) = E for 0 ≤

*t*≤

*a*and

*f*(

*t*) = 0 for

*t*>

*a*is

a step function

a pulse function

a shifted step function originating at

*t*=

*a*

none of the above

⇒ The average value of the wavefor

2 V

0 V

4 V

3 V

⇒ In 8085 microprocessor, how many lines are there in data bus?

6

8

2

16

⇒ Which is the dominant mode in rectangular waveguides?

TE

_{10}

TE

_{11}

TE

_{01}

TM

_{11}

⇒ The number of spectral component of impulse wave is

1

0

2

∞

⇒ Good frequency stability can be available

crystal oscillators

Hartley oscillators

colpitts oscillators

none of the above

⇒ The Laplace transform of impulse δ(

*t*) is

1

1/

*s*

*s*

1/

*s*

^{2}

⇒ Frequency shifting keying is basically a method involving

amplitude modulation

frequency modulation

phase modulation

none of the above