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Q1. | In Schering bridge, the potential of detector above earth potential is about |

A. | a few volts [Correct Answer] |

B. | 10 kV [Wrong Answer] |

C. | 1000 V [Wrong Answer] |

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

View Answer
Explanation:-
Answer : ADiscuss 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 Varactor diode has

a fixed capacitance

a fixed inductance

a voltage variable capacitance

a current variable inductance

⇒ If an amplifier with gain of - 1000 and feedback factor β = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be

0.1

0.05

0.002

0.0001

⇒ Atomic and molecular resonance is observed in many substances

at microwave frequencies

at low frequencies

at frequencies used in AM broadcast

at both (b) and (c)

⇒ L [

*f*(

*t*- a)] = F(

*j*ω)

*e*

^{-jωa}

TRUE

FALSE

⇒ 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

⇒ In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

class C amplifiers

linear devices

non-linear devices

harmonic devices

⇒ If the target area is small compared to wavelength of radar the situation is called

resonance region

Rayleigh region

optical region

binomial region

⇒ A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is

10 watt

1 watt

0.1 watt

0.01 watt

⇒ A single phase half wave converter is feeding a resistive load. Output dc power is P

_{dc}and total power delivered to load is P

_{ac}then

P

_{dc}= P

_{ac}for all values of firing angles

P

_{dc}= P

_{ac}if firing angle is less than 180°

P

_{dc}< P

_{ac}for all values of firing angles

P

_{dc}< P

_{ac}if firing angle is less than 180°

⇒

Match the following:

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

A. | Evanescent wave | 1. | Pattern multiplication |

B. | Skip distance | 2. | Mismatched transmission line |

C. | Return loss | 3. | Propagation in lossy medium |

D. | Antenna array | 4. | Short wave propagation |

5. | Propagation below cut-off |

A-5, B-2, C-4, D-3

A-2, B-4, C-1, D-5

A-5, B-4, C-2, D-1

A-1, B-3, C-4, D-5

⇒ Microprocessor 386SX is a 16/32 bit microprocessor. It has

16 bit registers and 32 bit data bus

16 bit registers and 16 bit data bus

32 bit registers and 32 bit data bus

32 bit register and 16 bit data bus

⇒ The coefficients F

_{n}in the exponential form of Fourier series are

independent of frequency

functions of frequency

even function of frequency

odd functions of frequency

⇒ If the bandwidth is increased by 2, the γ

_{FM}γ

_{AM}(where γ is the ratio of SNR of output to SNR at input, FM is frequency modulation and AM is amplitude modulation) is increased by a factor of

2

3

4

6

⇒ Conductivity σ, mobility μ and Hall coefficient K

_{H}are related as

μ = σK

_{H}

σ = μK

_{H}

K

_{H}= μσ

K

_{H}=(μσ)

^{1.1}

⇒ When the ac input signal is very large the instantaneous operating point CE amplifier moves all the way between

ac saturation and ac cut off points

ac operating and ac cut off points

ac saturation and ac operating points

none of the above

⇒ The ratio of diffusion constant for hole D

_{P}to the mobility for holes is proportional to

T

^{2}

T

1/T

T

^{3}

⇒ A dynamometer wattmeter is suitable for both dc and ac.

TRUE

FALSE

⇒ 2's complement representation of a 16 bit number (one sign bit and 15 magnitude bit) is FFFF. Its magnitude in decimal representation is

0

1

32676

65, 535

⇒ For a superconductor, magnetisation M in a field H is

extremely small

- H

- I

zero

⇒ Energy = voltage x charge.

TRUE

FALSE

⇒ The number of

*p*-

*n*junctions in a semiconductor diode are

0

1

2

1 or 2

⇒ For a transistor amplifier with self biasing network, the following components are used. R

_{1}= 4 kΩ, R

_{2}= 4 kΩ, R

_{C}= 1 kΩ. The approximate value of the stability factor 'S' will be

4

3

2

1.5

⇒ The fetching, decoding and executing of an instruction is broken down into several time intervals. Each of these intervals, involving one or more clock periods, is called a

instruction cycle

machine cycle

process cycle

none of the above

⇒ In the given figure shows a 10dB directional coupler. If power input at port 1 is 100 mW, power output at port

10 mW

15 mW

20 mW

25 mW

⇒ A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single tone frequency of 1 kHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unchanged, the bandwidth of the PM signal is

21 kHz

22 kHz

42 kHz

44 kHz

⇒ PAM stands for

Pulse Analogue Modulation

Phase Analogue Modulation

Pulse Amplitude Modulation

Phase Amplitude Modulation

⇒ A band elimination constant

*k*filter has series resonant circuit in series arms.

TRUE

FALSE

⇒ To obtain very high input and O/P impedance in a feedback amplifier, the type of feedback utilized

voltage series

current series

voltage shunt

current shunt

⇒

**Assertion (A):** In a differential amplifier the current through common emitter resistor is called tail current

**Reason (R):** CMRR of an op-amp indicates how a differential signal amplified

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ Which of the following produces upper and lower side frequencies?

Microphone

Demodulator in a superheterodyne receiver

Modulator in a. radio transmitter

Oscillator in a receiver