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Q1. | In intrinsic semiconductor the increase in conductivity per degree increase in temperature is about |

A. | 0.02 [Wrong Answer] |

B. | 0.06 [Correct Answer] |

C. | 0.15 [Wrong Answer] |

D. | 0.25 [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ Measurement of Hall coefficient enables the determination of

mobility of charge carriers

type of the conductivity and concentration of charge carriers

temperature coefficient and thermal conductivity

fermi level and forbidden energy gap

⇒ For oscillations to starts, the loop gain A β of the oscillator must be initially

less than unity

0.5

1

more than unity

⇒ The output

*y*(

*t*) of a continuous-time system

*S*for the input

*x*(

*t*) is given

S is linear and time-invariant

S is linear and time-varying

S is non-linear and time-invariant

S is non-linear and time-varying

⇒

**Assertion (A):** The reverse saturation current in a semiconductor diode is 4nA at 20°C and 32 nA at 50°C.

**Reason (R):** The reverse saturation current in a semiconductor diode doubles for every 10°C rise in temperature.

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

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

A is true but R is false

A is false but R is true

⇒ Henry is equivalent to

Volts/Ampere

Weber/Volt

Weber/Ampere

Weber/Ampere

^{2}

⇒ Which of the following theorems enables a number of voltage (or current) sources to be combined directly into a single voltage (or current) source?

Superposition theorem

Compensation theorem

Millman's theorem

Thevenin's theorem

⇒ The Shannon-Hartley law

refers to noise

defines bandwidth

describes signalling rate

refers to distortion

⇒ At corner frequency the phase angle of factor 1/(1 +

*j*ωT) is

+90°

-90°

+45°

-45°

⇒ The density of states (

*i.e.*number of states per eV per m

^{3}) in the conduction band for energy level

*E*is proportional to

E

E

E

^{1.5}

E

^{2}

⇒ An end fire array consisting of several half-wave lengths of directive gain 40, then find the width of major lobe

60

50

51.25

None of the above

⇒ In a synchro transmitter, which coil acts as primary?

Rotor

Stator

Partly rotor and partly stator

Tertiary

⇒ In an ac circuit the fundamental component of current wave lags the corresponding voltage wave by 20°. The third harmonic component of current wave lags the corresponding voltage by an angle.

less than 20°

more than 20°

equal to 20°

equal to or more than 20°

⇒ In equally tampered musical scale, an octave is divided into

12 intervals

10 intervals

7 intervals

5 intervals

⇒ The expression H

_{Z}= C cos(B

*x*) cos(A

*y*)

*yz*is for

TE wave

TM waves

both TE and TM waves

some TE and some TM waves

⇒ The saving of power in DSB-SC modulated at 80% is

NIL

0.8

0.7576

0.5

⇒ The gain of an FET amplifier can be changed by changing

*r*

_{m}

*g*

_{m}

R

_{d}

none of the above

⇒ In the figure, the

emits light when both S

_{1}and S

_{2}are closed

emits light when both S

_{1}and S

_{2}are open

emits light when only S

_{1}and S

_{2}is closed

does not Emit light, irrespective of the switched positions

⇒

Match the following:

List I (Amplifier coupling) | List II (Feature) | ||
---|---|---|---|

A. | RC | 1. | High voltage gain and impedance matching |

B. | Inductive | 2. | Ability to amplify dc and low frequency signals |

C. | Transformer | 3. | Minimum non-linear distortion |

D. | Direct | 4. | Low collector supply voltage can be used |

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

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

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

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

⇒ Let JCOKE = 3 and LPEPSI = 5. Consider the statement

1

15

10

⇒ For a standard 2nd order system the maximum overshoot is 10% to an unit step input. If the magnitude of the input is doubled, then maximum overshoot and percentage of maximum overshoot is:

maximum overshoot doubles and percentage of maximum overshoot is less than double

maximum overshoot doubles and percentage of maximum overshoot do not change

maximum overshoot remain same and percentage of maximum overshoot is double

maximum overshoot more than double and percentage of maximum overshoot is less than double

⇒ A Hartley oscillator uses FET with

*g*

*of 2 ms and*

_{m}*r*

*= 2 KΩ. The total coil inductance is 10 μH with turns ratio of input to output side of 1 : 10. It is tuned with a 50 pf capacitor. Find frequency of oscillations, amplifier gain margin in dB.*

_{d}7.11 MHz, 13.97 dB

7.3 MHz, 14.1 dB

6.93 MHz, 12.9 dB

7.4 MHz, 13 dB

⇒ In AM, if modulation index is more than 100%, then

bandwidth increases

the wave gets distorted

power of the wave increases

efficiency of transmission increases

⇒ The D.C. alpha(a) of a transistor is approximately

unity

10 to 50

100 to 500

1000 to 5000

⇒ DC ampere hour meter is an indicating instrument.

TRUE

FALSE

⇒ The scale of moving iron instrument is linear.

TRUE

FALSE

⇒ The polar plot for positive frequencies is shown below. The gain margi

- 8.02 dB

6.02 dB

5 dB

none of these

⇒ 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

⇒ For the logic circuit of the given figure the simplified Boolean expressio

A + BC

A + BC

A + B C

A + BC

⇒ Average latency time of magnetic tape memory is of the order of

1 μ sec

1 msec

1 sec

1 minute

⇒ Which of the following can be used to isolate a low impedance from a high impedance source?

Emitter follower

p filter

Darlington pair

Any of the above