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Q1. | The message carrying efficiency is best in |

A. | AM [Wrong Answer] |

B. | FM [Wrong Answer] |

C. | AM-SC [Correct Answer] |

D. | Phase modulation [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 :**

⇒ In the schematic representation of bipolar junction transistor, the direction of arrow shows the direction of flow of

holes

electrons

holes in

*pnp*and electrons in

*npn*

electrons in

*pnp*and holes in

*npn*

⇒ An op-amp has zero gain for common mode inputs. Then CMRR =

zero

infinite

high

low

⇒ Which of the following are synonymous?

MOSFET and IGEFT

FET and JFET

JFET and MOSFET

P-N-P and N-P-N

⇒ The figure of merit for a logic family is

gain band width product

(propagation delay time) (power dissipation)

(fan out) (power dissipation)

(noise margin) (power dissipation)

⇒ Is Schottky TTL, Schottky diode is used primary to

prevent saturation of the transistor

saturate the transistor

act as a switch

act as a controlling switch

⇒ When ac current is zero, no electrons are in motion.

TRUE

FALSE

⇒ The Hilbert transform of cos ω

_{1}

*t*+ sin ω

_{2}

*t*is

sin ω

_{1}

*t*+ cos ω

_{2}

*t*

sin ω

_{1}

*t*- cos ω

_{2}

*t*

cos ω

_{1}

*t*- cos ω

_{2}

*t*

sin ω

_{1}

*t*+ sin ω

_{2}

*t*

⇒ 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

⇒ It is desired to design a phase shift oscillator using an FET having a

*g*= 5000 μSiemen,

_{m}*r*= 40

_{d}*k*Ω and feedback circuit value of R = 10 K. Then value of C for oscillator operation at 1

*k*H

*z*and that of

*R*for A = 40 to ensure oscillator action are

_{D}6.4

*n*F, 80 K

6.5

*n*F, 10 K

6.5

*p*F, 10 K

65

*p*F, 80 K

⇒

**Assertion (A):** An electron having charge - *e* and mass *m* and lying in an electric field E is subjected to an acceleration - (*e*/*m*) E.

**Reason (R):** If there are *n* electrons/m^{3} moving with velocity *v*_{x} and each electron has a charge - *e*, the current density J = - *n* *ev*_{x}.

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

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

A is true but R is false

A is false but R is true

⇒ A string variable in Basic is

an alphabet followed by dollar sign

a digit followed by dollar sign

either (a) or (b)

neither (a) nor (b)

⇒ Telecine equipment in a TV studio consists of

projector telecine

flying spot telecine

digital CCD telecine

none of the above

⇒ In single phase half wave regulator, the average current over one full cycle

is always positive

may be positive or negative

may be negative

is always negative

⇒ The total number of leads in SCR, DIAC and TRIAC respectively are

3, 2, 3

2, 3, 3

3, 3, 2

3, 2, 4

⇒ Which of the following memories normally has highest storage capacity?

Magnetic disc

Magnetic tape

Semiconductor memory

Core memory

⇒ For the circuit shown in the figure, what is the frequency of the outpu

Twice the input clock frequency

Half the input clock frequency

Same as input clock frequency

Inverse of the propagation delay of the FF

⇒

Match the following:

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

A. | Synchro | 1. | Amplifier |

B. | Amplidyne | 2. | Actuator |

C. | Servo | 3. | Compensator |

D. | RC network | 4. | Transducer |

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

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

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

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

⇒ What happens when a paramagnetic material is heated above Curie temperature?

It becomes diamagnetic

It becomes nonmagnetic

It becomes ferromagnetic

It becomes anti-ferromagnetic

⇒ In amplitude modulation, carrier signals A cos ω

*t*has its amplitude A modulated in proportion with message bearing (low frequency) signal

*m(t)*. The magnitude of

*m(t)*is chosen to be __________ .

less than 1

less than or equal to 1

more than 1

none of these

⇒ The forbidden band in semiconductors is of the order of

6 eV

1 eV

10 eV

0.01 eV

⇒ The transfer function of a controller is given as K

_{p}+ K

_{d}.

*s*where K

_{p}and K

_{d}are constants. What type of controller is this?

Proportional

Proportional plus integral

Proportional plus derivative

Integral plus derivative

⇒ 11101

_{2}x 10001

_{2}=

111101101

111101100

11110

1100110

⇒ The scale of hot wire ammeter is

linear

non-linear

cramped

absolute linear

⇒ The primary constants of a transmission line are

R and L

R, L and C

R and C

R, L, G and C

⇒ The V MOS can handle __________ currents than a conventional MOSFET.

much lower

almost same

almost half

much larger

⇒ The switching expression corresponding

C D + B C

C ⊙ D

C ⊕ D

CD

⇒ After the death of INSAT-IB, the mainstay of the entire Indian satellite network for some time to come would be

INSTELSAT-V

INSAT-ID

INSAT-2

ARABSAT

⇒ The Nyquist plo

will start from (ω = ∞) in the first quadrant and will terminate (ω = 0) in the second quadrant

will start from (ω = ∞) in the fourth quadrant and will terminate (ω = 0) in the second quadrant

will start form (ω = ∞) in the second quadrant and will terminate (ω = 0) in the fourth quadrant

will start from (ω = ∞) in the first quadrant and will terminate (ω = 0) in the fourth quadrant

⇒ Read the following rules for scanning Boolean expressions in Pascal

- The expressions are scanned from left to right.
- The operations are scanned in the order NOT, AND, OR.
- All operators (
*i.e.,*NOT, AND and OR) are scanned together. - In one scanning all the operators of only one type are scanned.

All

1, 2 and 3 only

1, 2 and 4 only

2, 3 and 4 only

⇒ The turn on time of an SCR is 5 micro second. Its trigger pulse should have

short rise time with pulse width = 2.5 μs

long rise time with pulse width = 3 μs

short rise time with pulse width = 4 μs

long rise time with pulse width = 4 μs