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Q1. | A TV remote control works on the principle of |

A. | pulse code modulated ultra violet light [Wrong Answer] |

B. | pulse code modulated infrared light [Correct Answer] |

C. | demodulation [Wrong Answer] |

D. | either (a) or (b) [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒ Oscillator crystal is made of

silicon

germanium

diamond

quartz

⇒ The system of the given fi

has two poles and one zero in left half plane

has two poles and one zero in right half plane

has two poles in left half plane and zero in right half plane

none of the above

⇒ The range of life time carriers (electrons and holes) is

1 μ

*s*to 100 μ

*s*

1 nano sec to 1 μ

*s*

1 nano sec to hundreds of μ

*s*

none of the above

⇒ In

*n*-well CMOS fabrication substrate is:

heavily doped

*n*-type

heavily doped

*p*-type

lightly doped

*n*-type

lightly doped

*p*-type

⇒ Consider the follo

1 and 2

1 and 3

1, 2 and 3

2 and 3

⇒ The O/P char, of a FET is given in the figure. In which region is the device biased for small signal amplificat

*AB*

*BC*

*CD*

*BD*

⇒ For a Hertz dipole antenna, the Half Power Beam Width (HPBW) in the E-plane is

360°

180°

90°

45°

⇒ The addition of

*n*type impurity to intrinsic material creates allowable energy levels.

slightly below conduction band

slightly above conduction band

slightly below valence band

slightly above valence band

⇒ 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

⇒ If quadratic equation

*x*

^{2}- 1000

*x*+ 25 = 0 is solved using floating point arithmetic with 4 digit mantissa, the roots are

.1000 E 4 and .1000 E 4 respectively

.0000 E 4 and .0000 E 4 respectively

.1000 E 4 and .0000 E 4 respectively

None of the above

⇒ A 3 kV circuit uses SCR of 800 V rating. If derating is 25%, the number of SCRs in series is

4

5

6

8

⇒ The ratio of the diffusion coefficient in a semiconductor has the units

V

^{-1}

em.V

^{-1}

V.cm

^{-1}

V.

*s*

⇒ In a resistance loaded amplifier, the gain decreases at high frequencies because

decreasing reactance of the stray C

_{T}

increasing reactance of the stray C

_{T}

increasing reactance of C

_{T}

decreasing reactance of C

_{T}

⇒ A signal

*m*(

*t*) is multiplied by a sinusoidal waveform of frequency

*f*

_{c}such

0.5 M(

*f*+

*f*

_{c})

0.5 M(

*f*-

*f*

_{c})

0.5 M(

*f*+

*f*

_{c}) + 0.5 M(

*f*-

*f*

_{c})

0.5 M(

*f*-

*f*

_{c}) + 0.5 M(

*f*-

*f*

_{c})

⇒ In figure the number of tree branches and links respectively

3 and 2

1 and 3

4 and 1

1 and 4

⇒ In a Hurwitz polynomial

all coefficients are non-negative

the coefficients may be positive or negative

all coefficients are negative

all coefficients are non-negative and all zeros should be either in left half plane or simple on the imaginary axis

⇒ When satellite radio beam is aimed towards earth, it illuminates on the earth for an oval shaped area called

foot print

beam area

satellite service area

radiated area

⇒ The intrinsic resistivity of silicon at 300 K is about

1 Ω-cm

400 Ω-cm

10000 Ω-cm

230000 Ω-cm

⇒ An ac network has two sources of the same frequency. The currents in one branch when the sources act independently are 10 ∠30° A and 10 ∠60° A. When both sources act, the current in the branch should be

19.32 ∠45°

15 ∠45°

20 ∠45°

zero

⇒ The radiation pattern of a parabola antenna is

omnidirectional

a figure of directional

highly directional

none of the above

⇒ The most frequent users of long distance VLF transmission is

ship communication

radio broadcasting

TV broadcasting

telephone and telegraph

⇒ Current density has the dimensions

IL

IL

^{-2}

IL

^{-3}

I

^{2}L

^{-2}

⇒ How is inversion achieved using EX-OR gate?

Giving input signal to the two input lines of the gate tied together

Giving input to one input line and logic one to the other line

Giving input to one input line and logic one to the other line

Inversion cannot be achieved using EX-OR gate

⇒ Higher value of ripple factor indicates

poor rectification

ideal rectification

r.m.s. value to peak value

none of the above

⇒ Binary number 11001 is equivalent to decimal number

35

15

105

25

⇒ A three-section RC phase shift oscillator has R = 10K ohms and C = 0.001 μF. If the oscillator is to be made variable using the same value of R, what should be the value of capacitor to obtain a frequency if 1 kHz?

636 pF

180 pF

65 pF

30 pF

⇒ The life time of a geosynchronous communication

5

10

20

50

⇒ A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be

20 kΩ

19.9 kΩ

1.9 kΩ

20.1 kΩ

⇒ A 4 bit ripple counter starts in 0000 state. When the counter reads 0010 the number of clock pulses which have occurred is

2

18

2 or 18

2 or 18 or 34

⇒ In the given fi

0 rad/sec

2 rad/sec

3/2 rad/sec

None of these