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Q1. | In a receiver, which of the following device has IF input but RF output? |

A. | Demodulator [Correct Answer] |

B. | Loudspeaker [Wrong Answer] |

C. | Audio amplifier [Wrong Answer] |

D. | Frequency changer [Wrong Answer] |

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

⇒ In a series regulated power supply circuit the voltage gain of pass transistor satisfies the condition

A

_{v}→ ∞

1 << A

_{v}→ ∞

A

_{v}≈ 1

A

_{v}<< 1

⇒ In figure, I

_{D}= 4 mA. Then V

_{S20 V16 V6 V0.6 V}

⇒ Dielectric strength of which of the following material has the highest dielectric strength?

Porcelain

Soft rubber

Glass

Joule effect

⇒ In an RC impedance function

the highest critical frequency is a pole

the highest critical frequency is a zero

the highest critical frequency is a pole or zero

the highest critical frequency is a pole at

*s*= 0

⇒ In the circuit, V

_{s}= 10 cos ω

*t*, power drawn by the 4Ω resistor is 8 watt. The power facto

1

0.5

0.85

0

⇒ When two 16-input multiplexers drive a 2-input MUX, what is the result?

2-input MUX

4-input MUX

16-input MUX

32 input MUX

⇒ In low pass filter of figure R

_{0}= 1 Ω and cut off frequency is 1 rad/sec. The values of L and C

1 H and 2 F

1 H and 1 F

2 H and 1 F

1 H and 2 F

⇒ To find the current in a 20 Ω resistance connected in a circuit, Norton's theorem is used. I

_{N}= 7.5 A. The current though 20 Ω resistance.

is 7.5 A

is less than 7.5 A

may be 7.5 A or less

may be 7.5 A or more or less

⇒ In the circuit shown, the device connected to Y5 can have address in the r

2000 - 20FF

2D00 - 2DFF

2E00 - 2EFF

FD00 - FDFF

⇒ In FM, as bandwidth increases

distortion increases

distortion decreases

distortion remains unaffected

all

⇒ If

*u*is input,

*y*is output and

*a*,

*b*are constants, the system

*y*=

*au*+

*b*

is linear

is nonlinear

may be linear or nonlinear dependig on values of

*a*and

*b*

may be linear or nonlinear depending on value of

*u*

⇒ An 8 level encoding scheme is used in a PCM system of 10

*k*H

*z*channel BW. The channel capacity is

80

*kbps*

60

*kbps*

30

*kbps*

18

*kbps*

⇒ The power rating of radio transmitters is around

100 mW

10 W

10 kW

10 MW

⇒ Given a power supply filter circuit, what measurements must be made of determine percentage regulation

current through and voltage across the capacitor

d.c. load voltage and r.m.s. load voltage

current through load and voltage across load resistance

number of turns and gauge of secondary winding of transformer

⇒ If two networks are connected in series of individual Z parameter as Z

_{a}and Z

_{b}then equivalent Z is

[Z] = [Z

_{a}] + [Z

_{b}]

[Z] = [Z

_{a}] [Z

_{b}]

[Z] = [Z

_{a}]/[Z

_{b}]

[Z] = [Z

_{a}] - [Z

_{b}]

⇒ A piece of copper and another piece of Germanium are cooled from 30°C to 80 K. The resistance of

copper decreases and germanium increases

both decreases

both increases

copper increases and germanium decreases

⇒ A Hartley oscillator is used for

very low frequencies

radio frequencies

micro wave frequencies

audio frequency

⇒ The electron and hole concentration in a intrinsic semiconductor are

*n*

_{i}and P

_{i}respectively when doped with a P type material, these change to

*n*and P, respectively. Then

*n*+ P =

*n*

_{i}+ P

_{i}

*n*+

*n*

_{i}= P + P

_{i}

*n*P

_{i}=

*n*

_{i}P

*n*

_{P}=

*n*

_{i}P

_{i}

⇒ A full adder is to be implemented using half adders and OR gates. A 4 bit parallel adder without any initial carry requires

8 half adders and 4 OR gates

8 half adders and 3 OR gates

7 half adders and 3 OR gates

7 half adders and 4 OR gates

⇒ In a RL circuit, the angle, θ by which the current lags the voltage is

0 > θ > - 90°

90°

0°

0 < θ < 90°

⇒ Noise can be measured by

D.C. voltmeter

A.C. voltmeter

either of the above

none of the above

⇒ Consider the following statements as regards DPSK and DEPSK

- DPSK demodulator requires a device which operates at carrier frequency and provides a delay of bit time T
_{b} - In DPSK, synchronous demodulation recovers the signal
*b*(*t*) and the decoding of*b*(*t*) to generate*d*(*t*) is done at base band - In both DPSK and DEPSK errors always occur in pairs

1 and 3

1 and 2

2 and 3

1, 2 and 3

⇒ A clipper

adds a dc component to the input signal

removes signal voltages above or below a specified value

both (a) and (b)

either (a) or (b)

⇒ A perfect conductor is a perfect absorber of electromagnetic waves.

TRUE

FALSE

⇒ For the network shown below, the Thevenin voltage and R

_{TH}is equal to _______

0 V, 58.82 Ω

0 V, 96.774 Ω

0 V, 3 KΩ

None of these

⇒ When modulation index of an AM wave is increased from 0.5 to 1, the transmitted power

remains the same

increases by 25%

increases by 33.3%

increases by 50%

⇒ The contents of the program counter after the call operation wil

(30F0)

_{H}

(40F0)

_{H}

(50F0)

_{H}

(60F0)

_{H}

⇒ A collector collects

electrons from the base in case of N-P-N transistor

electrons from the emitter in case P-N-P transistor

holes from the base in case of N-P-N transistor

holes from the base in case of P-N-P transistor

⇒ The series element for a prototype high pass filter is

resistive

inductive

capacitive

combination of L and C

⇒ Roughly the time required for microwave cooking as compared to conventional cooking is

about twice

about half

about 10 times

about one-tenth