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

A. | semiconductors [Wrong Answer] |

B. | all metals [Wrong Answer] |

C. | good conductors of electricity [Wrong Answer] |

D. | insulators [Correct Answer] |

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

⇒ For the time domain response shown in figure the

lies in left half plane

lies on imaginary axis

lies along the positive real axis

may be complex or imaginary

⇒ 2's complement representation of a 16 bit number (one sign bit and 15 magnitude bits) is FFFF. Its magnitude in decimal representation is

0

1

32, 767

65, 535

⇒

**Assertion (A):** A GTO circuit is more compact than SCR circuit

**Reason (R):** A GTO can be turned off by negative gate pulse.

Both A and R are correct and R is correct explanation of A

Both A and R correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

⇒ If

*f*

_{1}and

*f*

_{2}and half-power frequency and

*f*

_{0}be resonant frequency, the selectivity of R-L-C series circuit is given by

(

*f*

_{2}-

*f*

_{1})/2

*f*

_{0}

(

*f*

_{2}-

*f*

_{1})/

*f*

_{0}

(

*f*

_{2}-

*f*

_{0})/(

*f*

_{1}-

*f*

_{0})

(

*f*

_{2}-

*f*

_{1})/(

*f*

_{1}-

*f*

_{0})

⇒ An audio signal of FM radio station is sampled at a rate of 15% above the Nyquist rate. Signal is sampled in 512 levels and bandwidth of the signal is 4 KHz. The minimum bandwidth required to transmit this signal will be

77 K bits/sec

92 K bits/sec

84.8 K bits/sec

82.8 K bits/sec

⇒ R, L and C are in parallel. The circuit is switched on to a constant current source I at

*t*= 0. At

*t*= ∞ the current through inductance is I.

TRUE

FALSE

⇒ Dish antennas are

loop

helical

parabolic

conical

⇒ When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K.

273

243

170

123

⇒ A transmitter power of 5 W is increased by 20 dB. The effective radiated power is

5 W

100 W

25 W

500 W

⇒ A dipole antenna was radiating with some excitation in free space radiating a certain amount of the power. If this antenna is immersed in a lake where water is non-dissipative but has a dielectric constant of 81, the radiated power with the same excitation will

decrease to finite non-zero value

remain the same

increase

decrease to zero

⇒ For a transfer function H(

*s*) = P(

*s*)/Q(

*s*), where P(

*s*) and Q(

*s*) are polynomials in

*s*

the degrees of P(

*s*) is always greater than degree of Q(

*s*)

the degree of P(

*s*) and Q(

*s*) are equal

the degree of P(

*s*) is independent of degree of Q(

*s*)

the maximum difference in degrees of P(

*s*) and Q(

*s*) is 1

⇒ In a wave the electric field lines are vertical. Then the wave is

horizontally polarized

vertically polarized

either (a) or (b)

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⇒ An instruction used to set the carry flag in a computer can be classified as

data transfer

arithmetic

Logical

program control

⇒ A series resonant circuit has inductance L. If L is increased, the resonant frequency

increases

decreases

remains constant

may increases or decreases

⇒ The logic realized by the circuit shown in figure belo

F = A - C

F = A + C

F = B ⊙ C

F = B ⊕ C

⇒ For transistor 2 N 338 the manufacturer specifies P

_{max}= 100 mW at 250°C free air temperature and maximum junction temperature of 125°C. Its thermal resistance is

10° C/W

100° C/W

1000° C/W

5000° C/W

⇒ Consider the following statements about a good power supply:

- The a.c. ripple should be high
- S
_{v}, (Voltage stability factor) should be low - S
_{T}, (Temperature stability factor) should be low

1, 2 and 3

2 only

3 only

2 and 3 only

⇒ In figure, I

_{C}&as

I

_{1}

I

_{B}

0.5 I

_{1}

0.5 I

_{B}

⇒ Stray capacitance is important at low frequencies.

TRUE

FALSE

⇒ Two 16 : 1 and one 2 : 1 multiplexers can be connected to form a

16 : 1 multiplexer

32 : 1 multiplexer

64 : 1 multiplexer

8 : 1 multiplexer

⇒ The circuit of the given figure gives the output

*YAB*

A + B

A B

A + B

A + B

A B

A + B

⇒ The beam of a radar should be

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very wide

neither too narrow nor very wide

either (

⇒ The semi-conductor type 2 N 34 indicates

a

a JFET

a diode with two electrodes

a diode with three electrodes

⇒ A narrow band FM does not have the following feature

it has two sidebands

both sideband equal in magnitude

both sideband have same Phase Difference

it does not show Amplitude variation

⇒ A function

stable

marginal stable

unstable

none

⇒ The baud rate is

always equal to the bit transfer rate

equal to twice the bandwidth of an ideal channel

not equal to the signalling rate

equal to one half the bandwidth of ideal channel

⇒ In a synchronous counter all flip flops are clocked together.

TRUE

FALSE

⇒ On which bands, do the optical fibers operate?

1 only

1 and 2 only

1, 2 and only

1, 3 and 4

⇒ An excitation is applied to a system at

non casual

stable

casual

unstable

⇒ In the diode circuit shown in figure the diodes are ideal. The impedance seen by source is

1 k ohm

2 k ohm

0.5 k ohm

infinite

⇒ The beam of a radar should be

very narrow

very wide

neither too narrow nor very wide

either (

*b*) or (*c*)⇒ The semi-conductor type 2 N 34 indicates

a

*n*-channel MOSFETa JFET

a diode with two electrodes

a diode with three electrodes

⇒ A narrow band FM does not have the following feature

it has two sidebands

both sideband equal in magnitude

both sideband have same Phase Difference

it does not show Amplitude variation

⇒ A function

*f*(*t*) =*k*isstable

marginal stable

unstable

none

⇒ The baud rate is

always equal to the bit transfer rate

equal to twice the bandwidth of an ideal channel

not equal to the signalling rate

equal to one half the bandwidth of ideal channel

⇒ In a synchronous counter all flip flops are clocked together.

TRUE

FALSE

⇒ On which bands, do the optical fibers operate?

- Ultra violet band
- Ultra high frequency band
- Visible light band
- Infrared band

1 only

1 and 2 only

1, 2 and only

1, 3 and 4

⇒ An excitation is applied to a system at

*t*= T and the response in zero for -∞ <*t*<*T*. This system isnon casual

stable

casual

unstable

⇒ In the diode circuit shown in figure the diodes are ideal. The impedance seen by source is

1 k ohm

2 k ohm

0.5 k ohm

infinite