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. | The number of noise sources in a BJT are |

A. | 3 [Correct Answer] |

B. | 2 [Wrong Answer] |

C. | 1 [Wrong Answer] |

D. | 4 [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ The main advantage of DM over PCM is

less bandwidth

less power

simple circuit

better S/N ratio

⇒ The contents of F register in 8085 are 01010001. This means

S = 0, Z = 1, AC = 1, P = 0 and CY=1

S = 1, Z = 1, AC = 1, P = 0 and CY=1

S = 1, Z = 0, AC = 1, P = 0 and CY=1

S = 1, Z = 0, AC = 0, P = 0 and CY=1

⇒ In a typical microcomputer data transfer takes place between

μP and memory

μP and I/O devices

memory and I/O devices

all of the above

⇒ The circuit in figur

rectifier

voltage to frequency converter

frequency to voltage converter

logarithmic amplifier

⇒ A resistance is measured by voltmeter-ammeter method. The voltmeter is 0-250V, ± 1% accuracy and ammeter is 0-5 A, ± 1 % accuracy. The readings of voltmeter and ammeter are 100 V and 2 A respectively. The error in the measured resistance can be

± 1%

± 2%

± 5%

± 10%

⇒ Figure shows an RC circuit. The magnitude plot V

_{2}/V

_{1will rise exponentially to R2/(R1 + R2) as ω → ∞will rise linearly to R2/(R1 + R2) as ω → ∞will decrease to zero as ω → ∞will rise 1 at ω = 0 and then decrease as ω → ∞}

⇒ In which frequency range is the noise figure in a transistor independent of frequency

intermediate frequencies

high frequency

low frequencies

both low and high frequencies

⇒ A pure tone at 1000 Hz has a dB level of 40 dB. If the required dB level is 100, the number of such tones is

2.5

60

10

^{4}

10

^{6}

⇒ The current due to thermionic emission is proportional to

T

T

^{2}

T

^{3}

T

^{4}

⇒ The logic performed by the high-noise immunity logic circuit shown belo

OR

AND

NOR

NAND

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

ABC + ABC

ABC + AB C

ABC + ABC

ABC + AB C

⇒ In a series resonant circuit Q is more than 10. Then the lower half power frequency ω

_{1}, and resonant frequency ω

_{0}are related as

ω

_{1}= ω

_{0}+ bandwidth

ω

_{1}= ω

_{0}+ 0.5 (bandwidth)

ω

_{1}= ω

_{0}- 0.5 (bandwidth)

ω

_{1}= ω

_{0}+ bandwidth

⇒ The symbol ! in Java means

logical NOT

logical OR

AND

logical XOR

⇒ In a common emitter BJT amplifier, the maximum usable supply voltage is limited by

avalanche Beakdown of Base-Emitter junction

collector emitter breakdown voltage with base open(βV

_{CEO})

collector emitter breakdown voltage with emitter open(βV

_{CEO})

zener break down voltage of the emitter base junction

⇒ In 8085

RST 6.5 and RST 5.5 are high level sensitive interrupts

RST 6.5 and RST 5.5 are low level sensitive interrupts

RST 5.5 is low level sensitive interrupt but RST 5.5 is high level-sensitive interrupt

RST 5.5 is low level sensitive interrupt but RST 6.5 is high level sensitive interrupt

⇒

**Assertion (A):** The *s* domain impedance of a series R-L circuit is R + *s*L irrespective of initial conditions.

**Reason (R):** Complex frequency *s* = σ + *j*ω.

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

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

⇒ If the ratio

*p*(

*s*)/

*q*(

*s*) represents a transfer function then

the degree of

*p*(

*s*) may be as small as zero, independent of degree of

*q*(

*s*)

the degree of

*p*(

*s*) and

*q*(

*s*) must be equal

the degrees of

*p*(

*s*) and

*q*(

*s*) must not be equal

the degrees

*p*(

*s*) and

*q*(

*s*) must differ by at least two

⇒ Consider a baseband binary PAM receiver shown below. The additive channel noise

*n*(

*t*) is whit with power spectral density S

_{N}(

*f*) = N

_{0}/2 = 10

^{-20}W/Hz. The low-pass filter is ideal with unity gain and cutoff frequency 1 MHz. Let Y

_{k}represent the random variable

*y*(

*t*

0.5 x

0.5 x

0.5 x

_{k}0.5 x*e*^{-3.5}0.5 x

*e*^{-5}0.5 x

*e*^{-7}0.5 x

*e*^{-10}

⇒ The permanent magnet field system of brushless dc servo- motor is generally on

stator

rotor

partly on stator and partly on rotor

either (a) or (b)

⇒ Diamond is a paramagnetic material.

TRUE

FALSE

⇒ Which mode is usually preferred for cascading?

CE

CB

CC

Any of the above

⇒ A multivibrator can be used as a

cavity resonator

harmonic generator

wave form modifier

any of the above

⇒ A seven bit (even parity) code 0010001 may have error. The correct code is

10001

1110001

11001

1111110

⇒ In a practical current source, the load current

is always equal to source current

is always less than source current

is always equal to or less than source current

cannot be higher than source current

⇒ Which of the following statement is false?

A half-wave dipole is a resonant antenna

A horizontal antenna transmits radio signal with horizontal polarization

The field strength of 200 mV/m will produced 200 μV of signal in an antenna 2 m long

All of the above

⇒ If each frequency component of

Hilbert transform of

Inverse Hilbert transform of

Laplace transform of

Fourier transform of

⇒ To obtain very high input and O/P impedance in a feedback amplifier, the type of feedback utilized

voltage series

current series

voltage shunt

current shunt

⇒ A clipper

adds a dc component to the input signal

removes signal voltages above or below a specified value

both (a) and (b)

either (a) or (b)

⇒ Coupling and bypass filters can be a source of

low-frequency parasitics

high-frequency parasitics

carrier frequency parasitics

none of the above

⇒ A source generates three symbols with probabilities 0.25, 0.25, 0.50 at a rate of 3000 symbols per second. Assuming independent generation of symbols, the most efficient source encoder would have average bit rate is as

6000 bits/sec

4500 bits/sec

3000 bits/sec

1500 bits/sec

⇒ The permanent magnet field system of brushless dc servo- motor is generally on

stator

rotor

partly on stator and partly on rotor

either (a) or (b)

⇒ Diamond is a paramagnetic material.

TRUE

FALSE

⇒ Which mode is usually preferred for cascading?

CE

CB

CC

Any of the above

⇒ A multivibrator can be used as a

cavity resonator

harmonic generator

wave form modifier

any of the above

⇒ A seven bit (even parity) code 0010001 may have error. The correct code is

10001

1110001

11001

1111110

⇒ In a practical current source, the load current

is always equal to source current

is always less than source current

is always equal to or less than source current

cannot be higher than source current

⇒ Which of the following statement is false?

A half-wave dipole is a resonant antenna

A horizontal antenna transmits radio signal with horizontal polarization

The field strength of 200 mV/m will produced 200 μV of signal in an antenna 2 m long

All of the above

⇒ If each frequency component of

*f*(*t*) is shifted by p/2, the resulting signal isHilbert transform of

*f*(*t*)Inverse Hilbert transform of

*f*(*t*)Laplace transform of

*f*(*t*)Fourier transform of

*f*(*t*)⇒ To obtain very high input and O/P impedance in a feedback amplifier, the type of feedback utilized

voltage series

current series

voltage shunt

current shunt

⇒ A clipper

adds a dc component to the input signal

removes signal voltages above or below a specified value

both (a) and (b)

either (a) or (b)

⇒ Coupling and bypass filters can be a source of

low-frequency parasitics

high-frequency parasitics

carrier frequency parasitics

none of the above

⇒ A source generates three symbols with probabilities 0.25, 0.25, 0.50 at a rate of 3000 symbols per second. Assuming independent generation of symbols, the most efficient source encoder would have average bit rate is as

6000 bits/sec

4500 bits/sec

3000 bits/sec

1500 bits/sec