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Q1. | In a degenerate n type semiconductor material, the Fermi level, |

A. | is in valence band [Wrong Answer] |

B. | is in conduction band [Correct Answer] |

C. | is at the centre in between valence and conduction bands [Wrong Answer] |

D. | is very near valence band [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 sawtooth current wave is passed through a resistance

the waveshapes of voltages across resistance and power will also the sawtooth

the waveshape of voltage across resistance will be sawtooth

the waveshape of power will be sawtooth

neither the voltage waveshape nor power wave-shape will be sawtooth

⇒ A 1 ms pulse can be converted into a 10 ms pulse by using which one of the following

An astable multivibrator

Stable multivibrator

A bistable multivibrator

A J-K flip-flop

⇒ With reference to C programming language, which of the following statements are correct?

- An identifier may start with an underscore.
- An identifier may end with an underscore.
- If is a valid identifier.
- The number of significant characters in and identifier is implementation dependent.

1 and 2 only

2 and 3 only

1, 2, 3 and 4

3 and 4 only

⇒ In an air cored coil, a current of 0.7 A causes a flux of 5 x 10

^{-6}Wb. If the core is made of cast iron and the coil is similar, the same current can set up a flux of about

5 x 10

^{-6}Wb

5 x 10

^{-8}Wb

10

^{-2}Wb

5 x 10

^{-4}Wb

⇒ Coupling and bypass filters can be a source of

low-frequency parasitics

high-frequency parasitics

carrier frequency parasitics

none of the above

⇒ The number of possible colours with a 4 line digital input monitor are

4

16

64

2

⇒ A single phase full converter can operate in

4 quadrants

3 quadrants

2 quadrants

1 quadrant

⇒

Match the following:

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

A. | Very low response at very high frequencies | 1. | Low-pass system |

B. | Over shoot | 2. | Velocity damping |

C. | Synchro-control transformer output | 3. | Natural frequency |

4. | Phase-sensitive modulation | ||

5. | Damping ratio |

A-1, B-5, C-4

A-3, B-2, C-4

A-2, B-5, C-4

A-4, B-1, C-3

⇒ In the figure shown, assume that all the capacitors are initially unchanged and V

_{i}(

*t*) = 10 U(

*t*) volts then V

_{0}(

*t*) is give

8

*e*

^{-0.004t}volts

8 (

*j*-

*e*

^{-0.004t}) volts

8

*u*(

*t*) volts

8 volts

⇒ In a bipolar transistor which current is largest

collector current

base current

emitter current

base current or emitter current

⇒ Radio broadcasting is a familiar example of

space multiplexing

time multiplexing

frequency multiplexing

none of the above

⇒ The capacitor filter provides poor voltage regulation because

the increase in ripple with load current causes a decrease in average voltage

the increase in ripple with load current causes a increase in average voltage

filter promotes ripple at peak voltage

none of the above

⇒ Choose the function

*f*(

*t*), - ∞ <

*t*< + ∞, for which a Fourier series cannot be defined

3 sin (25

*t*)

4 cos (20

*t*+ 3) + 2 sin (10

*t*)

exp - | t | sin 25

*t*

1

⇒ In the following non planar graph number of independent loop equations

8

12

7

5

⇒ For a full rectified sine wave, the form factor and peak factor respectively are

1.57 and 2

1.57 and 2

1.11 and 1.11

1.11 and 2

⇒ In the graphical analysis of CE amplifier circuit, the upper end of load line is called

saturation point

cut off point

Q point

none of the above

⇒ When two 16-input multiplexers drive a 2-input MUX, what is the result?

2-input MUX

4-input MUX

16-input MUX

32 input MUX

⇒ At absolute temperature

the forbidden energy gap in germanium is higher than that in silicon

the forbidden energy gap in germanium and silicon are equal

the forbidden energy gap in silicon is higher than that in germanium

none of the above

⇒ In a perfect conductor the resistor noise is

maximum

zero

very high

almost infinite

⇒ Digital circuits mostly use

Diodes

Bipolar transistors

Diodes and bipolar transistors

Bipolar transistors and FETs

⇒ The signal m(

*t*) = 10 cos 100 p

*t*is sampled at the rate of F

_{s}= 75 H

_{z, }then determine signal after sampling.

4 cos 100 p

*t*+ 8 sin 200 p

*t*

4 cos 100 p

*t*+ 8 sin 200 p

*t*+ cos 75 p

*t*

4 cos 25 p

*t*+ 8 sin 50 p

*t*+ cos 75 p

*t*

none

⇒ A longwave AM broadcast transmitter needs

very small carrier power

very large carrier power

small carrier power

large carrier power

⇒ The loops ' for , 'while' , 'do-while' are used in

Fortran 77

Pascal

C

none of the above

⇒ A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10

*n*F capacitor in the second branch. At resonance frequency is

100 rad/sec

10000 rad/sec

1000 rad/sec

more than 10000 rad/sec

⇒ In a class C operation

V

_{CC}is much larger than V

_{CE(sat)}

V

_{CC}is much smaller than V

_{CE(sat)}

V

_{CC}and V

_{CE(sat)}are nearly equal

none of the above

⇒ In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be

0.5 T

less than 0.5 T

more than 0.5 T

0.5 T or more or less

⇒ Wien bridge uses

lead network

lag network

lead-lag network

Both (a) and (b)

⇒ In the circuit of figure. The current supplied by battery at

*t*= &infin

0

0.208333333333333

less than 5 A

very large

⇒ Assuming that

*k*is an integer what would the result of following expression

8

7

7.5

zero

⇒ A clipper

adds a dc component to the input signal

removes signal voltages above or below a specified value

both (a) and (b)

either (a) or (b)