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Q1. | The concentration of minority carriers in an extrinsic semiconductor under equilibrium is |

A. | directly proportional to the doping concentration [Wrong Answer] |

B. | inversely proportional to doping concentration [Correct Answer] |

C. | directly proportional to intrinsic concentration [Wrong Answer] |

D. | inversely proportional to the intrinsic concentration [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 :**

⇒ Thyristors connected in series need static and dynamic stabilizing circuits.

TRUE

FALSE

⇒ Which of the following statements is incorrect?

A mesh with two resistors has two mesh currents

The algebraic sum of all voltages around any mesh or any loop must be zero

The principle node is a function where branch current can divide or combine

A Norton is a series circuit

⇒ If V = 20 + j20, then log

_{e}(A) A is

3.342 +

*j*45

28.28 ∠45°

400 ∠45°

3.342 +

*j*0.785

⇒ For a series RLC circuit bandwidth is ω

_{2}- ω

_{1}= R/2L.

TRUE

FALSE

⇒ A single phase half wave converter is feeding a resistive load. Just before triggering, the voltage across thyristor is

zero

about 1 V

same as input voltage

twice the input voltage

⇒ A capacitor behave to d.c. as

short-circuit

an open-circuit

it behaves to a.c.

none of these.

⇒ If the potential functions V

_{1}and V

_{2}satisfy Laplace's equation within a closed region and assume the same values on its surface, then which of the following is correct?

V

_{1}and V

_{2}are identical

V

_{1}is inversely proportional to V

_{2}

V

_{1}has the same direction as V

_{2}

V

_{1}has the same magnitude as V

_{2}but has different direction

⇒ The total lumens emitted by a source of 1 candle are

0.4 p

4 p

2 p

8 p

⇒ For an ideal noise free transistor amplifier the noise factor is

zero

zero dB

1 dB

depends on other factors

⇒ Which of these commutation methods uses an external pulse for commutation?

Class A

Class C

Class E

Class F

⇒ The system in the given figure

good gain and phase margins

good gain margin and poor phase margin

poor gain and phase margins

poor gain margin but good phase margin

⇒ A delta connection contains three impedances of 60 Ω each. The impedances of equivalent star connection will be

15 Ω

20 Ω

30 Ω

40 Ω

⇒ If two time varying signals of equal magnitudes and 90° phase displacement are applied to X and Y plates of CRO, the display will be

a straight line

a circle

an ellipse

a rectangle

⇒

**Assertion (A):** When performance specifications are given in term of transient response characteristics, root locus method is a suitable method.

**Reason (R):** When performance specifications in terms of state variables are given, modern control methods can be used.

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

⇒ In a uniform plane wave E and H are related by

E/H = 1

E/H = ε/μ

E/H = μ/ε

none of the above

⇒ In a CE amplifier, the collector resistance is 6 kΩ and load resistance is 3 kΩ. The ac load resistance is

9 kΩ

6 kΩ

3 kΩ

2 kΩ

⇒ The function shown in the given Figure can be writte

sum of two sinusoidal functions

sum of two sinusoidal functions one originating at

*t*= 0 and the other at

*t*= 1

difference of two sinusoidal functions one originating at

*t*= 0 and the other at

*t*= 1

none of the above

⇒ When a thyristor is conducting, the voltage drop across it

is absolutely constant

decreases with increase in load current

increases slightly with increase in load current

none of the above

⇒ Lead becomes a superconductor at

9.1 K

7 K

5 K

3 K

⇒ Surface impedance at high frequencies is a consideration for

ferrites

semiconductors

good conductors

dielectrics

⇒ The frequency at which phase angle is 180° is called

phase crossover frequency

stability limit frequency

frequency of limited stability

gain margin frequency

⇒ The circuit shown in figure

oscillate at 456 kHz

oscillate at 228 kHz

oscillate at microwave frequency

not oscillate

⇒ A 2 mH inductor with some initial current can be represented as shown below, where

*s*is the Laplace transform variable. The value of initial curren

0.5 A

1.0 A

2.0 A

0.0 A

⇒ Which of the following is invalid in Basic?

A ** B - C

5.2 ** 4.3

5.2 ** (- 4.3)

(- 5.2) ** (4.3)

⇒ The relation between the apparent power, actual power and reactive power is given by

Apparent power = actual power + reactive power

Apparent power = actual power - reactive power

Apparent power = (actual power)

^{2}- (reactive power)

^{2}

Apparent power = (actual power)

^{2}+ (reactive power)

^{2}

⇒ Which of the following theorems can be conveniently used to find power consumed in 10 Ω resistor in fig

Thevenin theorem

Maximum power transfer theorem

Millman's theorem

Superposition theorem

⇒

Match the following:

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

A. | Ratio of maximum energy stored to energy dissipated per cycle | 1. | Propagation constant |

B. | TEM mode is loss less medium | 2. | Cutoff frequency is zero |

C. | Ratio of frequency in radian to phase velocity of EM wave | 3. | Quality factor of cavity |

D. | TEM is the mode of lowest cutoff frequency | 4. | Cylindrical waveguide |

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

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

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

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

⇒ In radar system if the antenna diameter is increased by a factor of 4, the minimum range will increased by a factor of

1

2

22

4

⇒ Read the following statements: Dual slope ADC provides

- higher speed as compared to other ADC
- very good accuracy
- good rejection of power supply
- better resolutions compared to other ADC for the same number of bits

1 and 2

2 and 3

1, 2, 3

1, 2, 3, 4

⇒ In the forward blocking region of a silicon, controlled rectifier, the SCR is

in the off-state

in the ON state

reverse biased

at the point of breakdown