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Q1. | A photoconductor is a |

A. | conductor [Wrong Answer] |

B. | semiconductor [Correct Answer] |

C. | insulator [Wrong Answer] |

D. | superconductor [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 :**

⇒ The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X results in a binary number without overflow. This implies that the result is

-ve and is in normal form

-ve and 2's complement form

+ve and is in normal form

+ve and in 2's complement

⇒

**Assertion (A):** When a square periodic wave is applied to an RC circuit, the voltage across capacitor is observed to be a triangular periodic wave.

**Reason (R):** The RC circuit works as integrator and its time constant is much larger than time period of input wave.

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

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

A is true but R is false

A is false but R is true

⇒ A noiseless 3 KH

*z*channel can transmit binary at the rate __________ .

12000

*bps*

10000

*bps*

6000

*bps*

3000

*bps*

⇒ Fibers have numerical aperture (

*NA*) in the range of 0.15 to 0.4 Fibers with higher

*NA*value would have

reduced losses

high bandwidth

reduced losses and low bandwidth

more losses and low bandwidth

⇒ In a 3 phase full wave regulator feeding a star connected resistance load the input voltage is 400 V line to line. The firing angle is 160°. The line to line output voltage would be

400 V

about 100 V

about 20 V

zero

⇒ A certain transistor has a

_{dc}of 0.98 and a collectors leakage current of 5 μA. If I

_{E}= 1 mA, the base current will be

35 μA

25 μA

15 μA

5 μA

⇒ In 8 cavity magnetron the p mode corresponds to a total phase shift equal to

± 8 p radians around the periphery

± 4 p radians around the periphery

± 2 p radians around the periphery

± 16 p radians around the periphery

⇒ A network contains only independent current source and resistors. If the values of all resistors are doubled, the value of the node voltage

will become half

will remain unchange

will become one third

cannot be determined unless the circuit configuration and the values of the resistors are known

⇒ If a driving point function N(

*s*) =

*p*(

*s*)/

*q*(

*s*), then

the degree of

*p*(

*s*) and

*q*(

*s*) may differ by one only

the degree of

*p*(

*s*) and

*q*(

*s*) may differ by zero only

the degrees of

*p*(

*s*) and

*q*(

*s*) be equal

the degrees of

*p*(

*s*) and

*q*(

*s*) must not be equal

⇒ In which counter does the maximum frequency depend on the modulus?

Synchronous

Ripple

Both synchronous and ripple

Neither synchronous nor ripple

⇒ A 12 bit ADC is operating with 1 μs clock period. Total conversion time is 14 μs. ADC is

flash type

counting type

integrating type

successive approximation type

⇒ Which of the following expressions is true for apparent power in an A.C. circuit?

VI cos Φ

V

_{av}x I

_{av}

V

_{r.m.s}x I

_{r.m.s}

V

_{peak}x I

_{peak}

⇒ The portion of the atmosphere closest to ground is called ionosphere.

TRUE

FALSE

⇒ An antenna has a gain of 44 dB. Assuming that the main beam of the antenna is circular in cross-section the beamwidth will be

0.4456°

1.4456°

2.4456°

3.4456°

⇒ Two ammeters A and B both 0-10 A have internal resistance of 1 Ω and 0.5 Ω respectively. They are connected in parallel. If total current is 15 A, then

I

_{A}= I

_{B}= 7.5 A

I

_{A}= 5 A, I

_{B}= 10 A

I

_{A}= 10 A, I

_{B}= 5 A

I

_{A}= 9 A, I

_{B}= 6 A

⇒

**Assertion (A):** The trigger circuit of a CRO is excited by the same signal as Y plates.

**Reason (R):** The time base generator develops a saw tooth voltage.

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

⇒ The average noise temperature of Earth, as viewed from space, is __________ °K.

254

303

100

500

⇒ 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

⇒ A CE amplifier is the most common BJT amplifier.

TRUE

FALSE

⇒ The different access methods which permit many satellite users to operate in parallel through a single transponder without interfering with each other as

Frequency Division Multiple Access (FDMA)

Time Division Multiple Access (TDMA)

Code Division Multiple Access (CDMA)

All of the above

⇒ In a half wave diode rectifier circuit the current flows in the load circuit for

90° in each cycle

180° in each cycle

270° in each cycle

360° in each cycle

⇒ In voltage amplifiers, the load resistance

should be a small as possible

should be as large as possible

must be equal to output impedance

must be half of output impedance

⇒ The greatest negative number which can be stored is 8 bit computer using 2's complement arithmetic is

-256

-128

-255

-127

⇒ The unit of loudness is

phon

sone

decibel

mel

⇒ The addressing mode depicted in the given figur

direct

register

register indirect

implicit

⇒ Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is

average of the time constants of individual coils

sum of the time constants of the individual coils

geometric mean of the time constants of individual coils

product of the time constants of the individual coils

⇒ In the circuit of figure β = 100 and quiescent value of base current is 20 μA. The quiescent value of colle

0.2 μA

2 μA

2 mA

20 mA

⇒ In a colour TV receiver AFT stands for

Automatic Fine Tuning

Automatic Frequency Tuning

Automatic Field Tuning

Alignment Frequency Tuning

⇒ The sum of positive real function is positive real.

TRUE

FALSE

⇒ All of the following elements have three valence electrons EXCEPT

boron

indium

gallium

arsenic