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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 :**

⇒

Match the following:

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

A. | Reactance theorem | 1. | Foster |

B. | Driving point impedance | 2. | Bartlett |

C. | Continued fraction expansion | 3. | Cauer |

D. | Bisection Theorem | 4. | Positive real function |

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

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

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

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

⇒ Most popular IF for receivers tuning to 540 to 1650 kHz is

433 kHz

455 kHz

545 kHz

555 kHz

⇒ If a line having Z

_{0}= 300 ∠ 0 W is open circuited at far end, VSWR is

0

1

∞

2

⇒ Whereas resonant antenna is bidirectional, non-resonant antenna is unidirectional.

TRUE

FALSE

⇒ In a two phase servomotor the voltages applied to the two stator windings

are equal in magnitude and are in phase

are unequal in magnitude but are in phase

are equal in magnitude but have a phase difference of 90°

are unequal in magnitude and have a phase difference of 90°

⇒ 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

⇒ With JFETs cascade means

a common source driving a common gate connection

a common gate driving a common source connection

two FETs connected in parallel

none of the above

⇒ Which of the following is invalid integer variable name in Fortran?

IAEG

I 124

AILG

MI AC

⇒ Denominator polynomial of a transfer function of certain network

stable

oscillatory

unstable

depends on numerator polynomial

⇒ In the diode circuit shown in figure the diodes are ideal. The impedance seen by source is

1 k ohm

2 k ohm

0.5 k ohm

infinite

⇒ In the given figure A = 1, B = 1. B is now changed to a sequence 101010................The outputs X and Y wil

fixed at 0 and 1 respectively

X = 1010.......and Y = 0101........

X = 1010..........and Y = 1010

fixed at 1 and 0 respectively.

⇒ If the ratio

*p*(

*s*)/

*q*(

*s*) represents a transfer function then

the degree of

*p*(

*s*) may be as small as zero, independent of degree of

*q*(

*s*)

the degree of

*p*(

*s*) and

*q*(

*s*) must be equal

the degrees of

*p*(

*s*) and

*q*(

*s*) must not be equal

the degrees

*p*(

*s*) and

*q*(

*s*) must differ by at least two

⇒ If each frequency component of

*f*(

*t*) is shifted by p/2, the resulting signal is

Hilbert transform of

*f*(

*t*)

Inverse Hilbert transform of

*f*(

*t*)

Laplace transform of

*f*(

*t*)

Fourier transform of

*f*(

*t*)

⇒ In a synchro transmitter

input is angular position of rotor shaft and output is stator voltages

input is stator voltages and output is angular position of shaft input is rotor voltage and output is angular position of rotor shaft

input is rotor voltage and output is angular position of rotor shaft

input is angular position of rotor shaft and output is rotor voltage

⇒ The main purpose of using transformer coupling in a class A amplifier is to make it more

efficient

less costly

less bulky

distortion free

⇒ For a given value

*(n)*of principle quantum number, the number of possible electronic states are

*n*

*n*

^{2}

*n*

^{3}

*n*

⇒

**Assertion (A):** The root locus of a control system is symmetrical about real axis.

**Reason (R):** For all polynomials with real coefficients, complex poles always occur in conjugate pairs.

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

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

A is correct but R is wrong

R is correct but A is wrong

⇒ The most commonly used devices for differencing and amplification, in control systems, are

BJT amplifiers

FET amplifiers

operational amplifiers

either (a) or (b)

⇒ If other parameter are constant, transmission loss at 5 GHz as compared to that at 0.5 GHz is

20 dB more

20 dB less

700 dB more

100 dB less

⇒ Instruction cycle is the time required to complete the execution of an instruction.

TRUE

FALSE

⇒ The power factor at the input terminals of a cyclo- converter is generally

low and leading

low and lagging

high and leading

high and lagging

⇒ In a semiconductor material. The hole concentration is found to be 2 x 2.5 x 10

^{15}

*cm*

^{-3}. If mobility of carriers is 0.13

*m*

^{2}/

*v-s*. Then find the current density if electric field intensity is 3.62 x 10

^{-19}

7.6237 x 10

^{-4}A/

*cm*

^{2}

7.6237 x 10

^{-5}A/

*cm*

^{2}

7.6237 x 10

^{-3}A/

*cm*

^{2}

none of these

⇒ If operator '

*a*' = 1 ∠120° then (1 -

*a*

^{2}) =

1 ∠ - 30°

1 ∠ 30°

1 ∠ - 60°

1 ∠60°

⇒ For what positive value of K does the polynomial

*s*

^{4}+ 8

*s*

^{3}+ 24

*s*

^{2}+ 32

*s*+ K have roots with zero real parts?

10

20

40

80

⇒ VLF is generally used for

telegraphy

satellite communication

instrument landing system

all of the above

⇒ One coulomb charge is equal to the charge on

6.24 x 10

^{18}electrons

6.24 x 10

^{24}electrons

6.24 x 10

^{18}atoms

none of the above

⇒ To make antenna more directional, either its size must be increased or

the number of its feed horns must be increased

the frequency of its transmission must be increased

its effective isotropic radiated power (EIRP) must be increased

its footprint must be increased

⇒ Lower chip area requirements of MOS is advantage in

low power circuits

high power circuits

repetitive operation circuits

large scale integration

⇒ A 4 bit ripple counter is in 0000 state. The clock pulses are applied and then removed. The counter reads 0011. The number of clock pulses which have occurred are

3

3 or 19

3 or 19 or 35

none of the above

⇒

**Assertion (A):** As per Miller theorem a capacitance C from input to output appears as a much larger capacitance across input terminals

**Reason (R):** In a lag network the output voltage appears across capacitor

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct