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Q1. | Measurement of hall coefficient enables the determination of |

A. | mobility of charge carriers [Wrong Answer] |

B. | type of conductivity and concentration of charge carriers [Correct Answer] |

C. | temperature coefficient and concentration of charge carriers [Wrong Answer] |

D. | fermi level and forbidden energy gap [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 :**

⇒ Hay bridge is suitable for measuring inductance of which one of the following inductors?

Having Q value less than 10

Having Q value greater than 10

Having any value of Q

Having phase angle of reactance very large

⇒ Which of the following parameters is not specified for digital ICs?

Gate dissipation

Propagation delay

Noise margin

Bandwidth

⇒ Which of the following meters requires an external power source for its operation?

P.M.M.C. meter

Hot wire ammeter

Electronic voltmeter

Electrodynamometer

⇒

Match the following:

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

A. | Evanescent wave | 1. | Pattern multiplication |

B. | Skip distance | 2. | Mismatched transmission line |

C. | Return loss | 3. | Propagation in lossy medium |

D. | Antenna array | 4. | Short wave propagation |

5. | Propagation below cut-off |

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

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

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

A-1, B-3, C-4, D-5

⇒ Wood is a diamagnetic material.

TRUE

FALSE

⇒ An antenna having an effective temperature of 27°K is fed into a microwave amplifier that has an effective noise temperature of 30 K. Calculate the available noise power per unit bandwidth

30 K

57 K

27 K

3K, K is Boltzmann constant

⇒ Consider the following statements regarding negative feedback

- It increases system gain
- It improves sensitivity
- It improves system stability

all

1, 2

1, 3

1 only

⇒ Consider the following statements about mutual inductances:

- The value should remain constant under all conditions.
- The mutual inductance should not vary with temperature.
- The inductance should be independent of excitation.
- They have two coils wound on a bobbin of hard magnetic material, coils being separated by a range.

2, 3, 4

1, 2, 3

1, 3, 4

1, 2, 4

⇒ For the system of the given figure, the closed loop poles ar

0 and -4

-2 ±

*j*6

2 ±

*j*6

-3 ±

*j*8

⇒ In the case of the circuit shown in the figure, the collector current I

_{C}will be, if β = 100, V

_{BE}= 0.7 V, I

_{CO}= 0.1 βA at 20&d

2.26 mA

1.85 mA

0.357 mA

0.185 mA

⇒ The system in the given fi

will be unstable due to the presence of positive feedback in the inner loop

may be stabilized by the negative feedback outer loop

can never be stable

will always be stable

⇒ In amplitude modulation

the amplitude of carrier varies in accordance with the amplitude of the modulating signal

the modulating frequency lies in the audio range

the amplitude of the carrier remains constant

the amplitude of the carrier varies in accordance with the frequency of the modulating signal

⇒ CC circuit is suitable for impedance matching.

TRUE

FALSE

⇒ If V

_{a0}, V

_{a1}, V

_{a2}are sequence components of V

_{a}and I

_{a0}, I

_{a1}, I

_{a2}are sequence components of I

_{a}, then total 3 phase power P is given by

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*}

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2})

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*})

⇒ The system in the given figur

type 0 system

type 1 system

type 2 system

type 3 system

⇒ A full adder adds

2 bits

3 bits

4 bits

any number of bits

⇒ Consider the following statements

- Dissipative attenuator has a fixed value of attenuation.
- Reflective attenuator has a fixed value of attenuation.
- Both dissipative and reflective attenuators are available only with fixed attenuation.
- Both dissipative and reflective attenuators are available with either fixed or variable attenuation.

1 only

1 and 2

1, 2 and 3

4 only

⇒ The product

*k*T (where

*k*is Boltzmann's constant and T is absolute temperature) at room temperature is about

0.051 eV

0.026 eV

0.01 eV

0.001 eV

⇒

Match the following:

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

A. | p type semiconductor | 1. | silicon |

B. | n type semiconductor | 2. | holes are majority carriers |

C. | Intrinsic semiconductor | 3. | electrons are majority carriers |

D. | Tungsten | 4. | is a metal |

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

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

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

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

⇒ Consider the following statements about 8085

- The instruction
`LDA`

uses direct addressing mode. - The instruction
`MVI`

uses direct addressing mode. - The instruction
`MVI`

uses immediate addressing mode. - The instruction
`LDA`

uses immediate addressing mode.

1 and 3 only

3 and 4 only

1 and 2 only

2 only

⇒ The expression given is F(A, B, C, D, E, F, G, H) = Σ(33, 48, 102, 158, 222, 229, 233, 243, 255); then the __________ and __________ minterms are grouped together into dual and variable __________ is reduced using the dual

243, 233, D

222, 158, B

243, 255, A

229, 243, E

⇒ For a hollow waveguide, the axial current must necessarily be

combination of conduction and displacement current

conduction current only

time varying conduction current and displacement current

displacement current only

⇒ The thin parallel wires are carrying current along the same direction. The force experienced by one due to the other is

parallel to the lines

perpendicular to the lines and attractive

perpendicular to the lines and repulsive

zero

⇒ The parameter A of a two port network is equal to

V

_{2}/V

_{1}with I

_{1}= 0

V

_{1}/I

_{2}with V

_{2}= 0

I

_{1}/I

_{2}with V

_{2}= 0

V

_{1}/V

_{2}with I

_{2}= 0

⇒

**Assertion (A):** When V_{DS} is more than rated value the drain current in a JFET is very high.

**Reason (R):** When V_{DS} is more than rated value, avalanche breakdown occurs.

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

⇒ In a Hurwitz polynomial

all coefficients are non-negative

the coefficients may be positive or negative

all coefficients are negative

all coefficients are non-negative and all zeros should be either in left half plane or simple on the imaginary axis

⇒ Which liquid crystal is used for LCD display?

Mercury

Pneumatic fluid

Aqua regia

Liquid boron

⇒ In figure, I

_{C}&as

I

_{1}

I

_{B}

0.5 I

_{1}

0.5 I

_{B}

⇒ In a C expression using assignment operators, relational operators and arithmetic operators, the hierarchy of operations (in the absence of parenthesis) is

assignment, relational, arithmetic

relational, assignment, arithmetic

arithmetic, assignment, relational

arithmetic, relational, assignment

⇒ Satellite communication systems use the frequency band

10 to 20 MHz

50 to 70 MHz

3 to 6 GHz

100 to 120 GHz