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Q1. | The resistivity of intrinsic semiconductors, at room temperature, is of the order of |

A. | 1 Ω-m [Correct Answer] |

B. | 1000 Ω-m [Wrong Answer] |

C. | 10^{6} Ω-m [Wrong Answer] |

D. | 10^{-3} Ω-m [Wrong Answer] |

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Explanation:-
Answer : ADiscuss 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. | LED | 1. | Heavy Doping |

B. | Avalanche Photodiode | 2. | Coherent Radiation |

C. | Tunnel diode | 3. | Spontaneous Emission |

D. | LASER | 4. | Current gain |

A-2, B-4, C-3

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

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

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

⇒ Performance of a PIN diode switch is represented by

insertion loss when switch is off

insertion loss when switch is on

insertion loss when switch is on and isolation loss when switch is off

insertion loss when switch is off and isolation loss when switch is on

⇒ A TTL circuit with totem pole output has

high output impedance

low output impedance

very high output impedance

none of the above

⇒ The passband of the tuned circuits of a radio receiver should be equal to

20 kHz

455 kHz

1455 kHz

more than 455 kHz

⇒ In dielectric heating, the thyristor circuits consist of

rectifier-chopper combination

controlled rectifier

ac regulator

rectifier-inverter combination

⇒ The breakdown voltage in a zener diode

is almost constant

is very small

may destroy the diode

decreases with increase in current

⇒ Let

*f*

_{1}(

*t*) = G

_{1}(

*t*) + 4,

*f*

_{2}(

*t*) = G

_{2}(

*t*) + 3. If G

_{1}(

*t*) and G

_{2}(

*t*) are uncorrected then the correlation between

*f*

_{1}(

*t*) and

*f*

_{2}(

*t*) are

12

7

6

zero

⇒

Match the following:

List I (Functional components) | List II (Device) | ||
---|---|---|---|

A. | Error detector | 1. | Three phase FHP Induction motor |

B. | Servo motor | 2. | Synchro transmitter and control transformer |

C. | Amplifier | 3. | Tacho generator |

D. | Feed back | 4. | Armature controlled FHP dc motor |

5. | Amplidyne |

A-2, B-4, C-1, D-5

A-4, B-2, C-5, D-3

A-2, B-4, C-5, D-3

A-1, B-2, C-3, D-5

⇒ The reflection coefficient on a line is 0.2 ∠45°. The SWR is

0.8

1.1

1.2

1.5

⇒ For BJT, under saturation condition

I

_{C}= βI

_{B}

I

_{C}> bI

_{B}

I

_{C}is independent of all other parameters

I

_{C}< βI

_{B}

⇒ The forbidden energy gap between the valence band and conduction band will be wide in case of

semiconductors

all metals

good conductors of electricity

insulators

⇒ Which one is a causal system?

*y*(

*n*) = 3

*x*[

*n*] - 2

*x*[

*n*- 1]

*y*(

*n*) = 3

*x*[

*n*] + 2

*x*[n + 1]

*y*(

*n*) = 3

*x*[

*n*+ 1] + 2

*x*[

*n*- 1]

*y*(

*n*) = 3

*x*[

*n*+ 1] 2

*x*[

*n*- 1] +

*x*[

*n*]

⇒ Kirchoff's laws are applicable to

steady state conditions only

transient conditions only

both steady state and transient condition

both steady state and transient condition but with some constraints

⇒ 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

⇒ For the system in the given fi

*y*=

_{k}*u*+ 0.5

_{k}*y*

_{k - 2}*y*=

_{k}*u*+ 0.5

_{k}*u*

_{k - 2}*y*=

_{k}*u*- 0.5

_{k}*y*

_{k - 2}*y*=

_{k}*u*- 0.5

_{k}*u*

_{k - 2}⇒ A tachometer has a sensitivity of 4 V/1000

*rpm*. Express the gain constant of the tachometer in the units volts/(rad/sec).

0.0489

0.0381

2

none of these

⇒ Consider the following statements

- Acceptor level lies close the valence band.
- Donor level lies close to the valence band.
*n*type semiconductor behaves as an insulator at 0 K.*p*type semiconductor behaves as an insulator at 0 K.

2 and 3 are correct

1 and 3 are correct

1 and 4 are correct

3 and 4 are correct

⇒ In a series R-L-C circuit at the resonant frequency the

current is maximum

current is minimum

impedance is maximum

voltage is maximum

⇒ For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as

2E

3E

4E

6E

⇒ Which of the following microphones has maximum distortion?

Ribbon

Condenser

Crystal

Carbon

⇒ Since noise phase modulated FM wave, as the noise sideband frequency approaches the carrier frequency, the noise amplitude

is equalized

is increased

is decreased

remains constant

⇒ In figure, the charge on 0.8 μF capacito

100 μC

50 μC

40 μC

20 μC

⇒ An AND gate has four inputs. One of the inputs is low and other inputs are high. The output

is low

is high

is alternately low and high

may be high or low depending on relative magnitudes of inputs

⇒ In a proportional plus integral control action

proportional gain K

*is adjustable but integral time T*

_{p}*is constant*

_{i}proportional gain K

*is adjustable but integral time T*

_{p}*is adjustable*

_{i}both proportional gain K

*and integral time T*

_{p}*are adjustable*

_{i}both proportional gain K

*and integral time T*

_{p}*are constant*

_{i}⇒ The Voltage

*e*

_{0}in the figu

2 V

4 V

4/3 V

8 V

⇒ In an AM system, doubling of modulation index doubles the antenna current. The system is

single side band full carrier

vestigial side band

single side band suppressed carrier

double side band full carrier

⇒ Polystyrene has a relative permittivity of 2.7. If the wave is incident at an angle θ

_{i}of 30° from air into polystyrene, the angle of transmission will be nearly

0.2°

2°

18°

48°

⇒ A bridge rectifier circuit has a dc load current of 10 mA and a filter capacitance of 1000 μF. The peak to peak ripple voltage is

0.01 V

0.05 V

0.1 V

0.5 V

⇒ Which of the following amplifier circuits has highest input impedance?

Circuit using BJT

Circuit using JFET

Circuit using MOSFET

Either (a) or (b)

⇒ The amount of photoelectric emission current depends on the frequency of incident light.

TRUE

FALSE