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Q1. | The power density spectrum of noise voltage of resistor R can be expressed as |

A. | 2 kTR [Correct Answer] |

B. | 1 kTR [Wrong Answer] |

C. | 0.5 kTR [Wrong Answer] |

D. | 0.25 kTR [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 :**

⇒

**Assertion (A):** A video monitor does not need RF tuner and IF amplifier

**Reason (R):** The picture tube in TV is basically a CRT.

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

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

A is correct but R is wrong

A is wrong but R is correct

⇒ In most of instruments, the controlling torque is provided by

fluid fraction

spring

eddy current

either (a) or (c)

⇒ The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m

^{2}) and

*d*T/

*dx*(°C per metre) is

Q = K(

*d*T/

*dx*)

Q = - K(

*d*T/

*dx*)

K = Q(

*d*T/

*dx*)

*d*T/

*dx*= - QK

⇒ If the variance σ

_{x}

^{2}of

*d*(

*n*) =

*x*(

*n*) -

*x*(

*n*- 1) is one-tenth the variance σ

_{x}

^{2}of a stationary zero mean discrete time signal

*x*(

*n*), then the normalized autocorrelation function R

_{xx}(

*x*)/σ

_{x}

^{2}at

*k*= 1 is

0.95

0.9

0.1

0.05

⇒ When performing numerical calculations in floating point arithmetic

- Error may occur due to finite representation of numbers.
- Error may occur due to rounding.
- Error may occur due to finite representation of inherently infinite process.

All

1 and 2 only

1 and 3 only

2 and 3 only

⇒ Which of the following is multiband HF receiving antenna?

Square loop

Log-periodic

Conical horn

Folded dipole

⇒ Boolean algebra obeys

commutative law

associative law

distributive law

commutative, associative and distributive law

⇒ The amplifier used in miller voltage sweep should have a gain of

-∞

1

+∞

-1

⇒ In figure readings of the two voltmeters shoul

100 V on each meter

200 V on each meter

150 V on V

_{1}and 50 V on V

_{2}

50 V on V

_{1}and 150 V on V

_{2}

⇒ Both OR and AND gates can have only two inputs.

TRUE

FALSE

⇒ For the high-pass circuit to act as a differentiator, the time constant must be

small

very small in comparison to the time period of the input signal

very high in comparison to the time period of the input signal (that is low pass circuit)

moderate value

⇒ If X = 1 in the logic equation [X + Z { Y + (Z + X Y)}] { X + Z (X + Y)} = 1, then

Y = Z

Y = Z

Z = 1

Z = 0

⇒ A fully charged mobile phone with a 12 V battery is good for a 20 minute talktime. Assume that, during the talk time, the battery delivers a constant current of 2 A and its voltage drops linearly from 12 V to 10 V as shown in the figure. How much energy does the battery deliver during this talk t

220 J

12 kJ

13.2 kJ

14.4 kJ

⇒ The materials which become polarized on the application of mechanical stress are called piezoelectric.

TRUE

FALSE

⇒ In a microprocessor system the stack is used for

starting the program return address whenever a subroutine jump instruction is execute

transmitting and receiving input and output data

starting all important CPU register contents whenever an interrupt is to be serviced

storing program instructions for interrupt service routine

⇒ For the same length of arrays, half power beam-width of binomial array

is equal to that of uniform arrays

is less than that of uniform array

is more than that of uniform array

is negligible as compared to that of uniform array

⇒ Which of the following represents a stable system?

- Impulse response decreases exponentially.
- Area within the impulse response in finite.
- Eigen values of the system are positive and real.
- Roots of the characteristic equation of the system are real and positive.

1 and 4

1 and 3

2, 3 and 4

1, 2

⇒ The signals in 8086 are in maximum mode when

MN / MX pin is tied to V

_{cc }

MN / MX Pin is grounded

MN / Mx pin is left open

none of the above

⇒ In all base driver amplifiers

ac collector voltage is 180° out of phase with ac base voltage

ac emitter voltage is 180° out of phase with ac base voltage

ac collector voltage is in phase with ac base voltage

none of the above

⇒ The given characteristic polynomial

*s*

^{4}+

*s*

^{3}+ 2

*s*

^{2}+ 2

*s*+ 3 = 0 has

zero root in RHS of

*s*-plane

one root in RHS of

*s*-plane

two roots in RHS of

*s*-plane

three roots in RHS of

*s*-plane

⇒ The total field produced by an antenna array system at a distance from it is

sum of the field produced by the individual antennas of the array system

directional gain of antenna

linear antenna gain

vector sum of the field produced by the individual antennas of the array system

⇒ The low pass filter characteristic shown in figure realiza

TRUE

FALSE

⇒ In case of antenna the lower value of Q indicates

higher bandwidth

lower bandwidth

higher distortion

lower distortion

⇒ In order to receive a vertical polarized wave, the conductor of the dipole should be mounted

horizontally

vertically

at an angle of 45°

at an angle of 90°

⇒ What is an advantage of an electronic voltmeter over a non-electronic voltmeter?

Low power consumption

Low input impedance

The ability to measure wide ranges of voltages and resistance

Large portability

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

ampere

ampere/metre

volt

volt/metre

⇒ If the mantissa of a digital computer is 37 bit long then the accuracy of the digital computer will be of

37 decimal places

23 decimal places

11 decimal places

accuracy is independent of the length to mantissa

⇒ In FM, the frequency deviation is

always constant

directly proportional to modulating frequency

inversely proportional to modulating frequency

proportional to amplitude of modulating signal

⇒ The

*z*-transform of a particular signal is gi

casual and stable

non-casual and stable

non-casual and unstable

casual and unstable

⇒ When a ferromagnetic substance is magnetised, small changes in dimensions occur. Such a phenomenon is known as

magnetic hystresis

magnetic expansion

magneto striction

magneto calorisation