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Q1. | Which of the following photodetector does not provide gain? |

A. | Phototransistor [Wrong Answer] |

B. | Photoconductor [Wrong Answer] |

C. | Avalanche photodiode [Wrong Answer] |

D. | p-i-n photodiode [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 :**

⇒ A typical value of

*g*

_{m}for a FET is about 25 μs.

TRUE

FALSE

⇒ To find the current in a 20 Ω resistance connected in a circuit, Norton's theorem is used. I

_{N}= 7.5 A. The current though 20 Ω resistance.

is 7.5 A

is less than 7.5 A

may be 7.5 A or less

may be 7.5 A or more or less

⇒ A thyristor circuit is feeding an R-L load. The turn on time can be reduced by

decreasing R

decreasing L

increasing L

decreasing R and L together

⇒ A 3 bit up-down counter can count from

000 to 111

111 to 000

000 to 111 and also from 111 to 000

none of the above

⇒ In VCR, the chrominance signal's frequency is

up converted during recording and down converted during playback

down converted during recording and up converted during playback

not changed during recording and playback

any of the above depending on VCR system

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

A

AB

B

C

⇒ A multilevel decoder is more costly as compared to single level decoder.

TRUE

FALSE

⇒ Dynamic memory cells are constructed using

FETs

MOSFETs

Transistors

Flip flops

⇒ In an RC phase shift oscillator, the total phase shift of the three RC lead networks is

360°

180°

90°

0°

⇒ In position control system the device used for providing rate feedback voltage is

potentiometer

synchro-transmitter

synchro-transformer

tacho generator

⇒ A signal is sampled at Nyquist rate

*f*= 2

_{s}*f*

_{0}. The function can be recovered from its samples only. If it is a

Periodic square wave of fundamental frequency

*f*

_{0}

Triangular wave of fundamental frequency

*f*

_{0}

Periodic sine wave of fundamental frequency

*f*

_{0}

Unit impulse function

⇒

Match the following:

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

A. | Firm ware | 1. | Converts program in high level language to machine language |

B. | Compiler | 2. | Converts assembly language program into machine language |

C. | Assembler | 3. | Software embedded in hardware |

D. | Virtual addressing | 4. | Grouping information between various memories |

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

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

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

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

⇒ A high resistance was measured by loss of charge method. The voltmeter resistance was 10

^{10}ohms. The calculation gave the value of unknown resistance as 0.8 x 10

^{9}ohms. The true value of resistance is

0.8 x 10

^{9}Ω

less than 0.8 x 10

^{9}Ω

more than 0.8 x 10

^{9}Ω

either (b) or (c)

⇒ The multiplication of two

*n*bit numbers gives a product of length less than or equal to

*n*bits

2

^{n}bits

2

*n*bits

2

^{n}- 1 bits

⇒ State transition table and state transition diagram form part of design steps for

combinational circuits

sequential circuits

delay circuits

all of the above

⇒ The transformer cores operating at microwave frequency ranges are generally made up of

silicon steel

ferrites

albino

super alloy

⇒ In a minimum function

the degree of numerator and denominator are equal

the degree of numerator and denominator are unequal

the degree of numerator is one more than degree of denominator

the degree of numerator is one less than degree of denominator

⇒ Which one of the following devices is not used as the controller in a stabilizer?

DIAC

TRIAC

SCR

Power transistor

⇒ Reflex klystron oscillator is essentially a low power device

TRUE

FALSE

⇒ At room temperature, a possible value for the mobility of electrons in the inversion layer of a silicon

*n*-channel MOSFET is

450 cm

^{2}/V-s

1350 cm

^{2}/V-s

1800 cm

^{2}/V-s

3600 cm

^{2}/V-s

⇒ Consider the following digital circu

1 and 2

3 and 4

1, 2 and 3

1, 2, 3 and 4

⇒ Which of the following stages has no phase inversion of the signal?

Two CE stages

Three CE stages

CE and CC stages

CE stage and emitter follower

⇒ Fourier analysis indicate that a square wave can be represented as

a fundamental sine wave and odd harmonics

a fundamental sine wave and even harmonics

a fundamental sine wave and harmonics

fundamental and subharmonic sine waves

⇒ In a N-P-N transistor, when emitter junction is forward biased and collector junction is reverse biased the transistor will operate in

active region

saturation region

cut-off region

inverted region

⇒ The given characteristic polynomial

*s*

^{4}+

*s*

^{3}+ 2

*s*

^{2}+ 2

*s*+ 3 = 0 has

zero root in RHS of

*s*-plane

one root in RHS of

*s*-plane

two roots in RHS of

*s*-plane

three roots in RHS of

*s*-plane

⇒ In a 3 phase full converter, the instantaneous output voltage can have negative part if

firing angle is less than 60°

firing angle is less than 90°

firing angle is more than 60°

firing angle is more than 90°

⇒ Light dependent resistors are

highly doped semiconductor

intrinsic semiconductor

lightly doped semiconductor

either (a) or (c)

⇒ Consider the following statements:

- With increase in temperature Fermi-level tries to come in between the energy gap exactly at middle
- Mobility of electron in GaAs is very high compared to mobility of hole
- In LED, the light energy radiated due to recombination with the aid of traps.

1 and 2

1, 2 and 3

2 and 3

1 and 3

⇒ If the network in figure (1), (2) are equivalent at terminals A - B, then voltage V and resistance R

100V and 12 Ω

60V and 12 Ω

100V and 30 Ω

60V and 30 Ω

⇒ In a class C power amplifier the input frequency of ac signal is 1 MHz. If tank circuit has C = 1000 pF, the value of L =

25 μH

50 μH

100 μH

200 μH