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Q1. | The fourier transform of a voltage signal x(t) is X(f). The unit of X(f) is __________ . |

A. | volts [Wrong Answer] |

B. | volt^{2} [Wrong Answer] |

C. | volt/sec [Wrong Answer] |

D. | volt-sec [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ An amplifier with resistive -

*ve*feedback has two left poles in its open loop transfer function. The amplifier

will always be unstable at high frequencies

will be stable for all frequencies

may be unstable, depending on the feedback factor

will oscillate at low frequencies

⇒ Armstrong modulator generates

AM signals

FM signals

PM signals

both (b) and (c)

⇒ If a number of even functions are added, the resultant sum is

even function

odd funtion

either even or odd function

mixture of odd amd even functions

⇒ For a high pass filter, β = p in attenuation band.

TRUE

FALSE

⇒ Dish antennas are

loop

helical

parabolic

conical

⇒ The ASCII code is

5-bit code

7-bit code

9-bit code

11-bit code

⇒ Hay bridge is suitable for measuring inductance of which one of the following inductors?

Having Q value less than 10

Having Q value greater than 10

Having any value of Q

Having phase angle of reactance very large

⇒ In a 5 x 7 dot matrix, format, to store 64 alphanumeric characters we require

1120 bits

2240 bits

33 bits

64 bits

⇒ For a Gaussian process, auto-correlation sequence also implies that

statistical independence

statistical dependence

ergodic process

all

⇒ In cell communication

carrier frequency change

carrier frequency constant

depend upon location

depend upon geographical area

⇒ Barkhausen criterion is 1 + A

_{v}β = 0.

TRUE

FALSE

⇒ The logic represented by the abbreviation ECL is

Emitter Coupled Logic

Electron Carrier Logic

Encoding Clock Logic

Electrostatic Channel Logic

⇒ In 8085 microprocessor, the interrupt enable flip-flop is reset by

DI instruction only

system RESET only

interrupt acknowledgment only

all of the above

⇒ A half adder can be used only for adding

1 s

2 s

4 s

8 s

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | h_{ie} | 1. | 49 |

B. | h_{re} | 2. | 25 x 10^{-6}siemens |

C. | h_{fe} | 3. | 2.4 x 10^{-4} |

D. | h_{oe} | 4. | 1000 ohms |

A-1, B-2, C-3, D-4

A-4, B-3, C-2, D-1

A-3, B-4, C-1, D-2

A-4, B-3, C-1, D-2

⇒ In direct addressing mode of 8085

All instructions are 3 bytes long

All instructions are 3 bytes long except IN instruction which is 2 bytes long

All instructions are 3 bytes long except IN and OUT instructions which are 2 bytes long

All instructions are 2 bytes long

⇒ Hall coefficient is reciprocal of charge density.

TRUE

FALSE

⇒ Which of the following is not between F

_{2}layer and D layer?

E layer

F

_{1}layer

G region

All of the above

⇒ The combination of registers in 8085 is B-C, D-E, H-L only.

TRUE

FALSE

⇒ For the minterm designation Y = ∑ m (1, 3, 5, 7) the complete expression is

Y = A BC + A B C

Y = A B C + A B C + ABC + A BC

Y = A B C + A B C + ABC + A BC

Y = A B C + ABC + A BC + A BC

⇒ When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant. The modulation system is

FM

AM

phase modulation

none of the above

⇒ A sine wave with slew rate distortion looks like

step wave

square wave

triangular wave

cosine wave

⇒ In terms of ABCD parameters, the image parameter Z

_{11}is equal to

AC/BD

BD/AC

AB/CD

AD/BC

⇒ The current due to thermionic emission is given by Richardson Dushman equation.

TRUE

FALSE

⇒

**Assertion (A):** A rectifier with inductor filter is more efficient for high load current.

**Reason (R):** In rectifier with inductor filter we can use a larger choke to reduce ripple, larger choke will have higher dc resistance which will result in lower dc output voltage for higher load current.

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

⇒ A Darlington emitter follower circuit is some times used in the output stage of a TTL gate in order to

increase its I

_{QL}

reduce its I

_{0H}

increase its speed of operation

reduce power dissipation

⇒ Which of the following are useful in comparing the noise performance of receivers?

- Input noise voltage
- Noise figure
- Noise resistance
- Noise temperature

1, 2 and 3

1, 3 and 4

2, 3, 4

1, 2, 4

⇒ In what condition does BJT act like an open switch

cut off

saturation

active

both (b) and (c)

⇒ A voltage

*v*= 100 sin ω

*t*+ 10 sin 5 ω

*t*is applied to a pure capacitor having capacitance of 1 μF. If ω = 314 rad/sec, the current through the capacitor is

0.0314 cos 314

*t*+ 0.0157 cos 1570

*t*

0.0314 sin 314

*t*+ 0.0157 sin 1570

*t*

0.0314 cos 314

*t*+ 0.0314 cos 1570

*t*

0.0157 cos 314

*t*+ 0.0157 cos 1570

*t*

⇒ The signal m(

*t*) = 10 cos 100 p

*t*is sampled at the rate of F

_{s}= 75 H

_{z, }then determine signal after sampling.

4 cos 100 p

*t*+ 8 sin 200 p

*t*

4 cos 100 p

*t*+ 8 sin 200 p

*t*+ cos 75 p

*t*

4 cos 25 p

*t*+ 8 sin 50 p

*t*+ cos 75 p

*t*

none