Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | At 0 K the forbidden energy gap in intrinsic semi conductor is about |

A. | 10 eV [Wrong Answer] |

B. | 6 eV [Wrong Answer] |

C. | 1 eV [Correct Answer] |

D. | 0.2 eV [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss 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 :**

⇒ Which of these are two state devices?

Lamp

Punched card

Magnetic tape

All of the above

⇒ ∇

^{2}is

vector

scalar

depend on direction

none

⇒ Slotted line can be used for measurement of high frequencies

TRUE

FALSE

⇒ Consider the following sets of values of E, R and C for the circuit in the given fig

1 and 4

1 and 2

3 and 4

2 and 3

⇒ A first-order system has a time constant t. For unit ramp input, the steady state error is

t

^{2}

t

t

1/t

⇒ The inputs A, B, C of the given figure are applied to a 3 input NOR gate. The outpu

HIGH from 4 to 0

LOW from 0 to 4

HIGH from 0 to 1 and LOW from 1 to 4

LOW from 0 to 2 and HIGH from 2 to 4

⇒ A vacant electronic state moves in the same direction as would a positive charge carrier.

TRUE

FALSE

⇒ Which of the following is used as detector in audio frequency ac bridges?

AC voltmeter

CRO

Head phones

Vibration galvanometer

⇒ For a message signal

*m*(

*t*) = cos (2p

*f*) and the carrier frequency

_{m}t*f*, which of the following represents a single side band (SSB) signal?

_{c}cos (2p

*f*) cos (2p

_{m}t*f*)

_{c}tcos (2p

*f*)

_{c}tcos [2p(

*f*+

_{c}*f*) t]

_{m}[1 + cos (2p

*f*) cos (2p

_{m}t*f*)]

_{c}t⇒ Which of the following statements about the matched filter in a communication receiver are correct?

- Its impulse response depends on the signed shape
- It maximizes the SNR at the detection shape.
- It produces ISI.
- It may produce phase error if synchronization is improper.

1 and 4 only

1 and 2 only

2, 3 and 4

1, 2 and 4

⇒ In a Gunn diode oscillator drift velocity of electron is 10

^{7}cm/s and active region length is 10 x 10

^{-4}cm. The natural frequency of oscillation is

1 MHz

10 MHz

1 GHz

10 GHz

⇒ The M.K.S. unit of magnetic field intensity is

ampere

ampere/metre

volt

volt/metre

⇒ Consider following statements :

- Maximum energy of electrons liberated photoelectrically is independent of light intensity
- Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.

statement (1) is true and (2) is false

statement (1) and (2) both are true

statement (1) is false and (2) is true

statement (1) and (2) both are false

⇒ The circuit shown in figure

oscillate at 456 kHz

oscillate at 228 kHz

oscillate at microwave frequency

not oscillate

⇒ The temperature coefficient of resistivity of semiconductors is

positive

negative

may be positive or negative

very low

⇒ A two port network is symmetrical if

*z*

_{11}

*z*

_{12}-

*z*

_{12}

*z*

_{21}= 1

AD - BC = 1

*h*

_{11}

*h*

_{22}-

*h*

_{12}

*h*

_{41}= 1

*y*

_{11}

*y*

_{22}=

*y*

_{12}

*y*

_{21}= 1

⇒ For measuring a very high resistance we should use

Kelvin's double bridge

Wheatstone bridge

Meggar

Either (a) or (c)

⇒ A semiconverter feeding an RLE load operates in

first quadrant only

first and second quadrants

first and fourth quadrants

first and third quadrants

⇒ For a binary half subtractor having two inputs

*A*and

*B*the correct sets of logical expressions for the outputs

*D*(

*A*-

*B*) and

*X*= Borrow are

D = AB + AB, X = AB

D = AB AB, X = AB

D = AB + AB, X = AB

D = AB + A B, X = AB

⇒ The turn ratio of a transformer is 20:1, if a load of 10Ω is connected across the secondary, what will be the effective resistance seen looking into the Primary?

2 kΩ

4 kΩ

8 kΩ

32 kΩ

⇒ Method of images is applicable to which fields?

Electrostatic fields only

Electrodynamic fields only

Neither electrostatic fields nor electro-dynamic fields

Both electrostatic fields and electro-dynamic fields

⇒ The circuit of figure is ca

diode bias

current mirror

complementary mirror

none of the above

⇒ A negative-feedback closed-loop system is supplied to an input 5 V. The system has a forward gain of 1 and a feedback gain of 1 and a feedback gain of 1. What is the output voltage?

1.0 V

1.5 V

2.0 V

2.5 V

⇒ The hot resistance of a tungsten lame is about 12 times its cold resistance. Accordingly, the cold resistance of a 60 Ω, 120 V lamp is about __________ ohm.

5

240

2

2880

⇒ A real number consists of

integer part

integer part and fraction part

integer part, fraction part along with positive or negative sign

none of the above

⇒ The unit of displacement density is

volt/metre

ampere/metre

^{2}

coulombs/metre

coulombs/metre

^{2}

⇒ A circular sphere mile is the area of cross-section of a wire

having a diameter equal to 1 miles

having a radius equal to 1 miles

having a circumference equal to 1 miles

none of the above

⇒ For small size high frequency coils, the most common core material is

air

ferrite

powdered iron

steel

⇒ Quality factor will be

*a*/

*b*

*b*/

*a*

*b*/

*a*

*ab*

⇒ The decimal equivalent of the hexadecimal number E 5 is

279

229

327

0