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Q1. | Which one of the following is not a useful quantity for comparing the noise performance of receivers? |

A. | Noise figure [Wrong Answer] |

B. | Noise temperature [Wrong Answer] |

C. | Input noise voltage [Correct Answer] |

D. | Equivalent noise resistance [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 :**

⇒ The probability giving distribution of electrons over a range of allowed energy levels is known as

Maxwell's Distribution

Fermi-Dirac Distribution

Richardson Dushman Distribution

none of the above

⇒ An RL impedance function can also be realized as

RC impedance function

RC admittance function

LC impedance function

LC admittance function

⇒ Separation property of state-transition matrix is

φ(

*t*-

*t*

_{0}) = φ(

*t*) φ(

*t*

_{0})

φ(

*t*-

*t*

_{0}) = φ

^{-1}(

*t*) φ

^{-1}(

*t*

_{0})

φ(

*t*-

*t*

_{0}) = φ(

*t*) φ

^{-1}(

*t*

_{0})

φ(

*t*-

*t*

_{0}) = φ

^{-1}(

*t*) φ

^{-1}(

*t*

_{0})

⇒ The frequency at which phase angle is 180° is called

phase crossover frequency

stability limit frequency

frequency of limited stability

gain margin frequency

⇒ A series circuit has R = 5 Ω and C = 10 μF. At

*t*= 0 it is switched on to a 10 V dc battery. The maximum current in the circuit is

0.0833333333333333

0.0416666666666667

10

^{6}A

10 μA

⇒ Neutralization is used in RF amplifiers to

stop oscillation

increase bandwidth

improve selectivity

all of the above

⇒ Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.

TRUE

FALSE

⇒ For an N-point FFT algorithm with N = 2

^{m}which one of the following statements is TRUE?

It is not possible to construct a signal flow graph with both input and output in normal order

The number of butterflies in the

*m*

^{th}stage is N/m

In-place computation requires storage of only 2N node data

Computation of a butterfly requires only one complex multiplication

⇒ In a second order system, peak overshoot is independent of

damping factor

natural frequency

both damping factor and natural frequency

neither damping factor nor natural frequency

⇒ In a bridge inverter

an output transformer is essential

an output transformer is not essential

an output transformer cannot be connected

an output transformer, if used, can improve the efficiency of the circuit

⇒ Consider the following rules in Fortran

- A signed or unsigned real variable name or a real constant is a real expression.
- Two real expressions connected by an arithmetic operator is a real expression.
- A real variable or constant exponential by an integer constant or integer variable is not valid

All

1 and 2 only

1 and 3 only

2 and 3 only

⇒ For a BJT, under the saturation region.

I

_{C}= βI

_{B}

I

_{C}> βI

_{B}

I

_{C}is independent of other parameter

I

_{C}< βI

_{B}

⇒ The shape of torque-speed curve of a two phase servo- motor mostly depends on

ratio of rotor reactance to rotor resistance

ratio of stator reactance to rotor resistance

ratio of rotor reactance to rotor resistance and also the ratio of stator reactance to stator resistance

magnitude of stator voltages

⇒

**Assertion (A):** A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation is in parameters of active device and other components.

**Reason (R):** A large negative feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to feedback factor.

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

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ A '

*n*' bit sequence generator employing SR flip-flop has maximum length of the sequence as :

2

^{n}*n*

2

*- 1*

^{n}2

^{n}^{-1}

⇒ 8255 A is a

programmable peripheral interface

I/O device

memory chip

none of the above

⇒ If the diameter of a wire is doubled, its current carrying capacity becomes

one-fourth

half

twice

four times

⇒ A microprocessor can understand instruction written in

machine language only

mnemonics operation codes only

high language only

both machine language and mnemonics operation codes

⇒ An ohmmeter is a

moving coil instrument

moving iron instrument

dynamometer instrument

induction instrument

⇒ In figure the current through resist

is always equal to 130 mA

may vary between 130 mA and 10 mA

may vary between 65 mA and 10 mA

is always equal to 65 mA

⇒ A voltage multiplier circuit, using diodes and capacitors is suitable for

high voltage high current device

high voltage low current device

low voltage low current device

low voltage high current device

⇒ The maximum forward current in case of signal diode is in the range of

1 A to 10 A

0.1 A to 1 A

few milli amperes

few nano amperes

⇒

**Assertion (A):** There are no convergence issues with the discrete-time Fourier series in general.

**Reason (R):** A discrete-time signal is always obtained by sampling a continuous-time signal.

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

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

A is true but R is false

A is false but R is true

⇒ For the DAC in the given figure V

_{O10 V5 V4 V8 V}

⇒ When a substance is repelled by a magnetic field it is known as

ferromagnetic

antiferromagnetic

diamagnetic

paramagnetic

⇒ Radiation efficiency of an antenna is defined as the ratio of

Total power radiated by an antenna to the net power accepted by the antenna from the connected transmitter

The frequency at which minimum power is radiated to the frequency at which maximum power is radiated

Total power accepted from the transmitter to total power generated by the transmitter

Power in main lobe to that in the side lobe

⇒ The ratio of diffusion constant for hole D

_{P}to the mobility for holes is proportional to

T

^{2}

T

1/T

T

^{3}

⇒ The effective modulation index is:

0.91287

0.8306

1

none of these

⇒ In level clocking the output can change

on rising edge of clock cycle

on falling edge of clock cycle

during entire half cycle of the clock

none of the above

⇒ A system is stable if ROC

include the unit circle

exclude the unit circle

lies on Circle

entire plane