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Q1. | In colour TV receiver, varactor diode is used for |

A. | detection [Wrong Answer] |

B. | rectification [Wrong Answer] |

C. | tuning [Correct Answer] |

D. | both (a) and (b) [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ Which mode has the minimum cutoff frequency in rectangular wave guides?

TE

_{11}

TE

_{10}

TE

_{01}

TE

_{20}

⇒ The current through a 10 Ω resistance in a dc circuit having two emf sources is 3A. If this resistance is changed to 20 Ω, the new value of current will be

less than 3 A

equal or less than 3 A

equal to or less or more than 3 A

1.5 A

⇒ Two capacitors of 20 μF each are in series. The total capacitance is

5 μF

10 μF

40 μF

400 μF

⇒ In the circuit of figure diode will con

from 90 to 180° in the positive half cycle

from 30° to 180° in the positive half cycle

from 50° to 160° in the positive half cycle

from 30° to 150° in the positive half cycle

⇒ Read the following statements

- The circuitry of ripple counter is more complex than that of synchronous counter.
- The maximum frequency of operation of ripple counter depends on the modulus of the counter.
- The maximum frequency of operation of synchronous counter does not depend on the modulus of the counter.

1 only

1, 2

1, 2, 3

2, 3

⇒ A is even or B is true. Negation of above statement is

A is odd or B is false

A is odd and B is false

A is even or B is false

A is even and B is false

⇒ The peak factor is

rms value/peak value

rms value/average value

peak value/rms value

peak to peak value/rms value

⇒ For a given voltage, four heating coils will produce maximum heat when connected

all in parallel

all in series

with two parallel pairs in series

one pair in parallel with the other two in series

⇒ A 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000). Then, what will be input, if the output register shows 100111 at the end of conversion.

5.85 V

6 V

5 V

10 V

⇒ In a tape recorder

the width of air gaps of record and erase heads is almost equal

the air gap of record head is wider than the air gap of erase head

the air gap of erase head is wider than the air gap of record head

any of the two air gaps can be wider than the other

⇒ If the function

*A, B*are A = R + PQ + RS B = PQRS + PQRS + PQRSA = B

A =

*B*

no direct relation between

*A*and

*B*

insufficient data

⇒ The AM, PM, and TV broadcast frequencies are

of the same order as microwave range

much lower than microwave range

much higher than microwave range

either (a) or (c)

⇒ Secondary emission occurs in

diode

triode

tetrode

pentode

⇒ Nichrome is used for

overload line wires

heater coils

lamp filaments

all of the above

⇒ An accelerometer has a seismic mass of 0.05 kg and spring constant of 3 x 10

^{5}N/m. If maximum displacement of mass is ± 1 mm, the maximum acceleration which can be measured is

30 m/s

^{2}

60 m/s

^{2}

90 m/s

^{2}

120 m/s

^{2}

⇒ The number of protons in germanium atom is

4

16

28

32

⇒ The order of the differential equa

1

2

3

4

⇒

Match the following:

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

A. | Coastals receiver | 1. | VSB |

B. | Stereo-multiplexing | 2. | Demodulating DSB-SC |

C. | TV broad casting | 3. | FM radio broad casting |

4. | Slope overload | ||

5. | Matched filter |

A-1, B-3, C-2

A-2, B-3, C-1

A-2, B-1, C-4

A-4, B-3, C-1

⇒ The circuit I in figur

1 mA

4 mA

8 mA

10 mA

⇒ In a TV studios, flying spot scanner is a device for

mixing video and audio signals

telecasting feature films

live telecast of outdoor programs

telecast of indoor music programs

⇒ A voltage v = 5 + 50 sin ω

*t*/ + 5 sin 5 &omega

*t*is applied to a pure capacitor of capacitance 1 ωF. If

*f*/= 314 rad/sec, current is

1 + 0.0157 cos 314

*t*+ 0.00785 cos 1570

*t*

0.0157 cos 314

*t*+ 0.00785 cos 1570 t

0.0157 sin 314

*t*+ 0.00785 sin 1570

*t*

0.0157 sin (314

*t*/ + 45°) + 0.00785 sin (1570

*t*+ 45°)

⇒ Thevenin's theorem is used to find current in a branch of a network. It is now desired to find current in another branch of the network

the same Thevenin's circuit can be used

the same Thevenin's circuit with some modification can be used

it is necessary to find new Thevenin's circuit

either (b) or (c)

⇒ The logic realized by the circuit shown in fi

F = A ⊙ C

F = A ⊕ C

F = B ⊙ C

F = B ⊕ C

⇒ If two time varying signals of equal magnitude and zero phase displacement are applied to X and Y plates respectively; of CRO, the display will be

a straight line

a circle

an ellipse

a square

⇒ Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is

average of the time constants of individual coils

sum of the time constants of the individual coils

geometric mean of the time constants of individual coils

product of the time constants of the individual coils

⇒ The pure capacitor connected across an A.C. voltage consumed 20 W. This is due to

the capacitive reactance in ohms

the current flowing in the capacitor

the fused capacitor was a big one

none of the above

⇒ Two port network is said to be symmetrical if

Δ

_{h}= 1

Z

_{11}= Z

_{2}

A = Δ

all

⇒ At absolute zero temperature a semiconductor behaves like

an insulator

a super conductor

a good conductor

a variable resistor

⇒ A certain transistor has a

_{dc}of 0.98 and a collectors leakage current of 5 μA. If I

_{E}= 1 mA, the collector current will be

1.005 mA

0.985 mA

0.975 mA

0.955 mA

⇒ Registers and counters are similar in the sense that they both

count pulses

store binary information

are made from an array of flip-flops and gates integrated on a single chip

are shift registers