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Q1. | The power requirement of a RADAR used in military operations is |

A. | a few watts [Wrong Answer] |

B. | about 500 W [Wrong Answer] |

C. | about 2000 W [Wrong Answer] |

D. | a few megawatts [Correct Answer] |

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Explanation:-
Answer : DDiscuss 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 network has two sources of different frequencies. The only method of analysis which can be used to find current and voltages of different branches is the use of

Kirchoff's laws

Superposition theorem

Thevenin's theorem

Tellegen's theorem

⇒ (SI - A)

^{-1}= adj(

*s*I - A)/

*det*(

*s*I - A)

TRUE

FALSE

⇒ Given figure shows a unity feedback system. The ratio of time constants for open loop and closed loop response

0.0423611111111111

0.0840277777777778

0.126388888888889

0.0854166666666667

⇒ The capacity of a battery is expressed in terms of

current

voltage

none of these

current and voltage

⇒ The bandwidth of FM for Commercial Purpose is

88 - 108 MHz

85 - 110 MHz

90 - 110 MHz

infinite Range

⇒ In order to achieve good stabilization in potential divider method current I

_{1}through R

_{1}and R

_{2}should be

I

_{1}> 20 I

_{B}

I

_{1}> 15 I

_{B}

I

_{1}< 5 I

_{B}

I

_{1}> 10 I

_{B}

⇒ 1101

_{2}- 1001

_{2}=

1000

100

10

1

⇒ In the given figure shows a 3 bit shift register using TTL flip flops. Initially all the flip flops are set to 0 state. After 8 clock pul

A = 1, B = 1, C = 1

A = 1, B = 1, C = 0

A = 0, B = 1, C = 1

A = 0, B = 0, C = 1

⇒ A dynamometer wattmeter is connected in ac circuit. The measured power is

rms power

average power

peak power

instantaneous power

⇒ The number of stator field windings in an ac tachometer are

1

2

3

4

⇒ For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle the reflected wave will be

elliptically polarized

linearly polarized

right circularly polarized

left circularly polarized

⇒ Consider 49 cascaded amplifiers having individual rise time as 2 n sec. 3 n sec. ... 50 n sec. The input waveform rise time is 1 n sec. Then the output signal rise time is given time by (Assume output signal rise time is measured within 10 percent range of the final output signal.)

39 - 28 μsec

2.28 μsec

0.228 μsec

39.28 μsec

⇒ Parabolic and lens antenna used at

microwave frequency

medium frequency

low frequency

high frequency

⇒ A computer program is used to read N and compute N !. IF N = 6, the result will be

6

12

720

1040

⇒ In figure,

*i*(0

^{-}) and

*v*(0

^{-}) are zero. The switch is closed at

*t*= 0,

*i*(0

^{+}) and (∞)

3 A and 1.5 A

1.5 A and zero

3 A and zero

1.5 A and 3 A

⇒ The secondary lobes in binomial arrays can be reduced by

maintaining spacing between two consecutive radiating sources less than λ/2

maintaining the amplitudes in radiating sources, from outer towards the centre source, proportional to the coefficients of the successive terms of the binomial series

both (a) and (b)

none of the above

⇒ In TE

_{10 }mode the largest electric field in a rectangular wave guide, occurs

along centre line of broad wall (

*i*.

*e*.

*x*=

*a*/2)

along the broad wall (

*i*.

*e*.

*x*= 0 and

*x*=

*a*)

either (a) or (b)

neither (a) nor (b)

⇒ L[

*c*

_{1}

*f*

_{1}(

*t*) +

*c*

_{2}

*f*

_{2}(

*t*)] =

*c*

_{1}F

_{1}(

*j*ω) +

*c*

_{2}F

_{2}(

*j*ω)

*c*

_{1}F

_{1}(

*j*ω) -

*c*

_{2}F

_{2}(

*j*ω)

*c*

_{1}F

_{1}(

*j*ω) +

*c*

_{2}F

_{2}(

*j*ω) +

*c*

_{1}

*c*

_{2}

*c*

_{1}F

_{1}(

*j*ω) +

*c*

_{2}F

_{2}(

*j*ω) +

*c*

_{1}/

*c*

_{2}

⇒ Power gain of antenna equals directive gain in VHF and UHF range if and only if efficiency of the antenna is

0.25

0.5

0.75

1

⇒ The maximum range of a radar is proportional to

square root of peak transmitted pulse power

fourth root of peak transmitted pulse power

peak transmitted pulse power

none of the above

⇒ Which of the following statements is correct?

R-C is a dual pair

LC is a dual pair

Norton is a series circuit

Thevenin equivalent a parallel circuit

⇒ In an FM system, when the AF is 500 Hz and the AF voltage is 2.4 V, the deviation is 4.8 kHz. If the AF voltage is now increased to 7.2 V, the new deviation will be

4.8 kHz

9.6 kHz

14.4 kHz

28.8 kHz

⇒

Match the following:

List I (Devices) | List II (characteristic) | ||
---|---|---|---|

A. | BJT | 1. | Voltage controlled negative resistance |

B. | MOSFET | 2. | High current gain |

C. | Tunnel diode | 3. | Voltage regulation |

D. | Zener diode | 4. | High input impedance |

A-1, B-4, C-2, D-3

A-2, B-4, C-1, D-3

A-2, B-3, C-1, D-4

A-1, B-3, C-2, D-4

⇒ As per Matthiessen's rule, the total resistivity r of a conductor can be written as r = r

_{i}+

*a*T, where r

_{i}and

*a*are constants and T is absolute temperature. At very low temperatures

*a*T = 0

*a*T > r

_{i}

*a*T ∼ r

_{i}

*a*T < r

_{i}

⇒ A notch filter is sometimes used in communication receivers to

reduce receiver gain at some specific frequency

increase receiver gain at some specific frequency

made selectivity more precise

spread the bandwidth

⇒ If A = B = 1, the outputs P and Q in the given figure

P = Q = 0

P = 0, Q = 1

P = 1, Q = 0

P = Q = 1

⇒ The minimum decimal equivalent of the number 11C0 is

183

194

268

269

⇒ Three point tracking is achieved with

double conversion

padder capacitor

double spotting

variable selectivity

⇒ Consider the sequence

*x*[

*n*] = [- 4 -

*j*5 1 + J2 4]

[- 4 - J2.5 J2 4 -

*J*2.5]

[- J2.5 1 J2.5]

[- J5 J2 0]

[-

*x*1 4]

⇒ Which of the following uses a capacitor in the feedback path?

Active low pass filter

Active high pass filter

Both (a) or (b)

Neither (a) nor (b)