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Q1. | QAM stands for |

A. | Quasi-Amplitude Modulation [Wrong Answer] |

B. | Quadrature Angle Modulation [Wrong Answer] |

C. | Quadrature Amplitude Modulation [Correct Answer] |

D. | None of the above [Wrong Answer] |

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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 :**

⇒ A system has 12 poles or 2 zeros. Its high frequency asymptote in its magnitude plot has slope of

-200 dB/decade

-240 dB/decade

-280 dB/decade

-320 dB/decade

⇒ Three identical coils each having self inductance L are connected in series so that the fluxes of all the three are in the same direction. If mutual inductance between each pair of coils is M, the total inductance of the arrangement is

3 L + 9 M

1.5 L + 3 M

3 L + 3 M

3 L + 6 M

⇒ Maxwell's divergence equation for the magnetic field is given as

∇ . B = 0

∇

^{2}. B = 0

∇ . B = constant

∇

^{2}. B = constant

⇒ Harmonic distortion analyser

measures amplitude of each harmonic

measures rms value of fundamental frequency component

measures rms value of all harmonics except fundamental frequency

displays rms value of each harmonic on screen of CRO

⇒ The product of which of the following gives the figure of merit of a logic family?

Gain and bandwidth

Propagation delay time and power dissipation

Fan-out and propagation delay time

Noise margin and power dissipation

⇒ An ideal op-amp requires

zero input offset voltage

low input offset voltage

high input offset voltage

infinite input offset voltage

⇒ The carrier frequency will be if L = 50 µH and C = 1 nF.

512

612 kHz

712 kHz

812 kHz

⇒ The range of a cordless telephone is about

1000 m

500 m

100 m

10 m

⇒ The recently-introduces CD-ROM PC by Head Start Technologies Co. of New York enables users to view or play __________ .

vast amounts of text

graphics

music

all of the above

⇒ In magnetic film memory, the memory element consits of

plated wires

superconductive material

nickel iron alloy

doped aluminium

⇒ The resonance frequency is

ω

_{r}=

*a*

ω

_{r}=

*b*

ω

_{r}=

*k*

ω

_{r}=

*ba*

⇒ A coil of resistance R and inductance L is connected in series with 5 μF capacitor. The source frequency is equal to resonance frequency and circuit current is 0.5 A. Another 5 F capacitor is connected in parallel with the above capacitor. The circuit current will be

0.5 A

more than 0.5 A

less than 0.5 A

0.5 A or less

⇒ If sampling is done at the rate of 10 kHz. The bandwidth required is

35 kHz

70 kHz

10 kHz

1280 kHz

⇒ The colour of an object is decided by

the reflected colour

the wavelength transmitted through it

reflected colour for opaque object and wavelength transmitted through it for transparent objects

none of the above

⇒ Choose the correct statement

The reflection coefficient (r) of a transmission line is greater than 1

r varies from 0 to ∞

r is less than or equal to 1

r varies from - ∞ to + ∞

⇒ Computers use RC circuit for edge triggering.

TRUE

FALSE

⇒ The pole of a reactive function

lie on

*j*ω axis only

lie on negative real axis only

may lie anywhere on

*s*plane

lie on

*j*ω axis or on negative real axis

⇒ The

*z*transform of sequence

*x*[

*n*] = {2, 4, 3, 2}

2

*z*

^{-1}+ 4

*z*

^{-2}+ 3 + 2

*z*

^{+1}

2

*z*

^{-1}+ 3 + 4

*z*

^{+1}+ + 2

*z*

^{+2}

2

*z*

^{+1}+ 3

*z*

^{-1}+ 4

*z*

^{-2}+ 2

*z*

^{-3}

3 + 2

*z*

^{-1}+ 4

*z*

^{-2}+ 2

*z*

^{-1}

⇒ Which of the following counters can be used to divide the clock frequency of a microprocessor by 5?

3 bit counter

5 bit counter

mod 3 counter

mod 5 counter

⇒ In a tuned class C power amplifier the quiescent value of collector to emitter voltage is equal to (V

_{CC}denotes collector battery voltage)

V

_{CC}

0.5 V

_{CC}

0.25 V

_{CC}

either (b) or (c)

⇒ A step voltage E is applied to an R-L series circuit. At

*t*= 0, the current in the circuit is

E/R

E/L

infinity

zero

⇒ Wheatstone bridge is suitable for low resistances.

TRUE

FALSE

⇒ A potential of 7 V is applied to a silicon diode. A resistance of 1 K ohm is also in series with the diode. The current is

7 mA

6.3 mA

0.7 mA

0

⇒ A silicon sample A is doped with 10

^{18}Atoms/cm

^{3}of Boron. Another sample B of identical dimensions is doped with 10

^{18}atoms/cm

^{3}of phosphorus. The ratio of electron to hole mobility is 3. The ratio of conductivity of the sample A to B is

3

42738

42769

42796

⇒ When diodes are connected in series to increase voltage rating the peak inverse voltage per junction

should not exceed half the breakdown voltage

should not exceed the breakdown voltage

should not exceed one third the breakdown voltage

may be equal to or less than breakdown voltage

⇒ Which of the following couplings may cause unwanted clamping?

Resistive

Inductive

Capacitive

Both (a) or (b)

⇒ A higher value of Standing Wave Ratio indicates

least mismatch between line and load

greater mismatch between load and line

number of nodes is equal to the number of antinodes

none of the above

⇒ The resistance values of a PIN diode under positive bias and negative bias respectively are about

a few ohms and a kilo ohms

about 100 ohms and 1000 ohms

about 0.1 ohm and 100 ohms

about 1000 ohms and 10000 ohms

⇒ Boolean algebra obeys

commutative law

associative law

distributive law

commutative, associative and distributive law

⇒ A three terminal monolithic IC regulator can be used as

an a adjustable output voltage regulator alone

an adjustable output voltage regulator & a current regulator

a current regulator & a power switch

a current regulator alone