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Q1. | In energy band diagram of n type semiconductor, the donor energy level is |

A. | in valence band [Wrong Answer] |

B. | in conduction band [Wrong Answer] |

C. | slightly above valence band [Wrong Answer] |

D. | slightly below conduction band [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ The deflection of a DArsonval galvanometer is measured through a mirror and scale. The mirror is 1 m away from the light source. The mirror is mounted on, the moving system. If mirror rotates through 0.2 rad the displacement on the scale is

0.2 m

0.4 m

0.1 m

0.05 m

⇒ A unipole is also known as

omnidirectional radiator

unidirectional radiator

line radiator

none of the above

⇒ For the transport lag G(

*j*ω) =

*e*

^{-jωT}, the polar plot is

a semi circle

a circle

a unit circle

none of the above

⇒ In the figure circuit, V

_{1}= 40 V. When R is 10 Ω. When R is zero, the value of V

_{2}wil

40 V

30 V

20 V

10 V

⇒ Which of the following statements is written in plain English in 8085?

Data definition

Assignment

Conditional

Repetitive

⇒ In figure, capacitor is used to develop pulses of short duration and large duty cycle across R

_{2}when switch is closed. Which of the following combinations is best sui

R

_{1}and R

_{2}large but C small

R

_{1}and R

_{2}small but C large

R

_{1}and C large and R

_{2}small

R

_{2}and C large but R

_{1}small

⇒ Two resistances R

_{1}= 18.7 Ω. and R

_{2}= 3.624 Ω in series. The total resistance to the appropriate number of significant figures is

22.324 Ω

22.32 Ω

22.3 Ω

22 Ω

⇒ Which of the following cannot be the Fourier series expansion of a periodic signal?

*x*(

*t*) = 2 cos

*t*+ 3 cos 3

*t*

*x*(

*t*) = 2 cos pt + 7 cos

*t*

*x*(

*t*) = cos

*t*+ 0.5

*x*(

*t*) = 2 cos 1.5p

*t*+ sin 3.5 p

*t*

⇒ AGC voltage is applied to the stages which are

before the detector stage

after the detector stage

either before or after the detector stage

none of the above

⇒ If sound intensity is 8 W/m

^{2}, the dB level of this sound is about

5 dB

50 dB

129 dB

1290 dB

⇒ The purpose of using negative feedback in a op-amps is to

stabilize overall gain

increase output

stabilize overall gain and increase output

increase output and decrease input

⇒ The derating factor, for ambient temperature higher than specified, for a transistor is about

2.5 mW/°C

0.5 mW/°C

10 mW/°C

20 mW/°C

⇒ Baudot code is a six bit code.

TRUE

FALSE

⇒ A noiseless 3 kHz channel can't transmit binary bit at the rate

12000 bps

1000 bps

6000 bps

3000 bps

⇒ In figure (A) and

A represents PCM and B represents AM

A represents FM and B represents AM

A represents AM and B represents FM

A represents PCM and B represents FM

⇒ The effective height of an antenna is slightly greater than physical height because

wave velocity in conductor is less than its velocity in free space

wave velocity in conductor is more than its velocity in free space

resistance of conductor is less than that of free space

none of the above

⇒ The absolute values of pinch-off voltage and gate-source cut-off voltage are

nearly zero

complementary to each other

never equal

equal

⇒

*i*

_{1}(

*t*) for

*t*> 0 is give

2.5 - 2.5

*e*

^{-2t}

2.5 - 1.25

*e*

^{-2t}

1.25 - 1.25

*e*

^{-2t}

None of these

⇒ The minority carrier life time and diffusion constant in a semiconductor material are respectively 100 microsecond and 100 cm

^{2}/sec. The diffusion length is

0.1 cm

0.01 cm

0.0141 cm

1 cm

⇒ For measurement of high voltage capacitors the suitable bridge is

Wien bridge

modified De Sauty bridge

Schering bridge

either (a) or (b)

⇒ Decimal 18.29 when converted int 10's complement will become

81.7707

81.7

81.777

81.077

⇒ Consider the following program in C

0.2

0

3

⇒ The difference between sequential and combinational circuits is

Combinational circuits store bits

Combinational circuits have memory

Sequential circuits store bits

Sequential circuits have memory

⇒ The mean life time of carrier may range from 10

^{-9}seconds to hundreds of μ-seconds.

TRUE

FALSE

⇒ Boolean algebra obeys

commutative law

associative law

distributive law

commutative, associative and distributive law

⇒ A 2 bit BCD D/A converter is a weighted resistor type with E

_{R}= 1V, R = 1 MΩ and R

*= 10KΩ then Resolution in percent and volt is __________ .*

_{f}1%, 1 mv

10%, 10 mv

10%, 1 mv

1%, 10 mv

⇒ Out of Metal-film type and Carbon-film type, the one with better tolerance specification is

carbon-film

metal-film type

both have same tolerance

none of these

⇒ For the shaded area in Venn diagram of the given figure, the Boolean expressio

AB + BC + CA

ABC + A B C

ABC + A B C

ABC+AB

⇒ Heat sink results in

slower dissipation of heat to atmosphere

faster dissipation of heat to atmosphere

lower ambient temperature

lower transistor power

⇒ Heat in calories = I

^{2}R

*t*/4.186.

TRUE

FALSE