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Q1. | The forbidden energy gap between the valence band and conduction band will be least in case of |

A. | metals [Correct Answer] |

B. | semiconductors [Wrong Answer] |

C. | insulators [Wrong Answer] |

D. | all of the above [Wrong Answer] |

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

⇒ If a signal

*f*(

*t*/2) has energy is E/

*n*then energy of the signal

*f(nt)*is equal to __________ (

*n*is constant)

E/2

*n*

^{2}

2E/

*n*

^{2}

E/

*n*

^{2}

2E

*n*

^{2}

⇒ Which of the following is not valid in case of FETs?

It has low voltage gain

It has high input impedance

It has fast switching time

It is voltage controlled device

⇒ The circuit of the given figur

full adder

magnitude comparator

parity detector

none of the above

⇒ DC ampere hour meter is an indicating instrument.

TRUE

FALSE

⇒ When a ferromagnetic substance is magnetised, there are small changes in its dimensions. This phenomenon is called

hysteresis

magnetostriction

diamagnetism

bipolar relaxation

⇒ Each kilometer of travel in electromagnetic radiation means a time delay of

330 μs

33 μs

3.3 μs

0.33 μs

⇒ A sinusoidal current having peak value of 7.07 A is superimposed on dc of 5A. If a hot-wire ammeter is used to measure the combined current in the circuit, it will indicate __________ ampere.

7.07

10

12.07

2.07

⇒ Class A and Class B power amplifiers predominate at

audio frequencies

radio frequencies

all frequencies

audio and radio frequency

⇒ The Boolean function/implemented in the figure using two I/P multiplexer

ABC + ABC

ABC + AB C

ABC + ABC

ABC + AB C

⇒ Temperature is analogous to

voltage

flux

charge

none of the above

⇒ The terms RMS and average values apply only to sine waves.

TRUE

FALSE

⇒ In a bridge rectifier circuit the rms value of input ac voltage is 10 V. The PIV across each diode is

7.07 V

14.14 V

10 V

28.28 V

⇒ In a circular waveguide with radius

*r*, the dominant mode is

TM

_{01}

TE

_{01}

TM

_{11}

TE

_{11}

⇒ Which of the following is a valid real constant in FORTRAN 77?

1.2 E 231

3 E - 2

-3.2 E 2.3

1.2 E 23

⇒ Which factor determines whether the medium is free space, lossless dielectric, lossy dielectric or good conductor?

Attenuation constant

Constitutive parameters (σ, μ, ε)

Loss tangent

Reflection coefficient

⇒ In the TTL circuit in the figure, S

_{2}to S

_{0}are select lines and X

_{7}to X

_{0}are input lines. S

_{0}and X

_{0}are LSBs. The output

Indeterminate

A ⊕ B

A ⊕ B

C . A ⊕ B + C . (A ⊕ B)

⇒ The maximum counting range of a four stage counter using IC 74193 is

0 to 1023

0 to 4093

0 to 65535

0 to 131071

⇒ The impulse response

*h*(

*t*) of a linear time-invariant continuous time system is described by

*h*(

*t*) = exp (a

*t*)

*u*(

*t*) + exp (β

*t*)

*u*(-

*t*), where

*u*(

*t*) denotes the unit step function, and a and β are constants. This system is stable if

a is positive and β is positive

a is negative and β is negative

a is positive and β is negative

a is negative and β is positive

⇒ A single phase half wave converter is feeding a resistive load. Output dc power is P

_{dc}and total power delivered to load is P

_{ac}then

P

_{dc}= P

_{ac}for all values of firing angles

P

_{dc}= P

_{ac}if firing angle is less than 180°

P

_{dc}< P

_{ac}for all values of firing angles

P

_{dc}< P

_{ac}if firing angle is less than 180°

⇒ Some possible disadvantages of high level modulation in TV transmitters are

- Video monitor has to supply high video voltages upto several hundred volts into highly capacitive loads drawing high current at video frequencies
- The grid modulated stage presents a varying load to its driver
- The linearity and high video driving power present design problems

1 only

1 and 2 only

1, 2 and 3

2 and 3 only

⇒ The divergence of a vector is a scalar, while the curl of a vector is another

scalar

vector

unit vector

none of the above

⇒ An incremental model of a solid state device is one which represents the

ac property of the device at desired operating point

dc property of the device at all operating points

complete ac and dc behaviour at all operating points

ac property of the device at all operating points

⇒ In 8085 microprocessor, what is the memory address stored on the stack, when the program is interrup

0210 H

0.211 H

0118 H

020 FH

⇒ If

*x*= 0.1396 radians, the values of 1 - cos

*x*and 2 sin

^{2}(x / 2) using floating point arithmetic with a 4 digit mantissa are respectively

.1000 E - 1 each

.9727 E - 2 each

.1000 E - 1 and .9727 E - 2 respectively

.9727 E - 2 and .1000 E - 1 respectively

⇒ A 3 phase induction motor is fed by a 3 phase ac regulator to change the stator voltage. The variation in speed will be more if

load torque is constant

load torque increases with increase in speed

load torque decreases with increase in speed

either (a) or (b)

⇒ Which of the transistor models is most preferred for the analysis of a transistor circuit both at mid-band and at high frequencies?

h-parameter model

y-parameter model

s-parameter model

hybrid-p model

⇒ For operation of enhancement only N-channel MOSFET, value of gate voltage has to be

zero

low positive

high negative

high positive

⇒ In the given figure the line voltage after a number of reflections wil

30 V

-30 V

10 V

-10 V

⇒ In TE

_{10}mode of rectangular waveguide

there is one half sine wave variation along

*x*direction and one along

*y*direction

there is one half sine wave variation along

*y*direction and one along

*x*direction

there is one full sine wave variation along

*x*direction and one along

*y*direction

none of the above

⇒ A (75 -

*J*50) ohm load is connected to a coaxial of Z

_{0}= 75 ohm at 10 GHz. The best method of matching is to connect

an inductance at load

a short circuited stub at load

a short circuited stub at specific distance from load

a capacitance at specific distance from load