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Q1. | If the minimum range of a radar is to be doubled, the peak power has to be increased by a factor of |

A. | 2 [Wrong Answer] |

B. | 4 [Wrong Answer] |

C. | 8 [Wrong Answer] |

D. | 16 [Correct Answer] |

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Explanation:-
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⇒ Volt is equivalent to

joule/coulomb

joule/watt

joule/ampere

joule/volt

⇒ If B

_{max}is the maximum flux density, eddy current loss is proportional to

B

_{max}

B

^{1.6}

_{max}

B

^{2}

_{max}

B

^{3}

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⇒ Millman's theorem is the best to find

equivalent voltage or current source

equivalent voltage source

equivalent voltage and resistance of a circuit

none of the above

⇒ The voltage applied to an R-L circuit at

*t*= 0 when switch is closed is 100 cos (100

*t*+ 30°). The circuit resistance is 80 Ω and inductance is 0.6 H (in which initial current is zero). What is the maximum amplitude of current flowing through the circuit?

0.0416666666666667

0.0833333333333333

0.208333333333333

0.416666666666667

⇒ A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is

1 kHz

2 kHz

4 kHz

8 kHz

⇒ Consider the following statements as regards BPSK and QPSK:

- In BPSK we deal individually with each bit of duration T
_{b} - In QPSK we lump two bits to form a symbol
- In both BPSK and QPSK signal changes occur at bit rate
- In QPSK the symbol can have any one of four possible values

1, 2, 3, 4

1, 2, 3

1, 2, 4

2, 3, 4

⇒ An FM signal is modulated by an 8 kHz sine wave and has maximum and minimum frequencies of 100.05 MHz and 99.95 MHz respectively. Its deviation frequency is

100 kHz

100 MHz

500 kHz

108 kHz

⇒ For the circuit, let us assume that R = 1 Ω, L = 10

^{-3}H, and V(t) = 10 cos (1000

*t*+ 30°)V and the differential equation for I(

*t*) is give

7.07 cos (1000

*t*+ 15°) A

70.7 cos (1000

*t*- 30°) A

7.07 cos (1000

*t*- 15°) A

7.07 cos (1000

*t*+ 15°) A

⇒ Consider the following statements about diamagnetic material and diamagnetism.

- The materials have negative magnetic susceptibility.
- At very low temperature diamagnetic materials.

1 only

2 only

Both 1 and 2

neither 1 nor 2

⇒ Which of the following is not a valid arithmetic statement in C?

*x*=

*x*+ 1

*x*=

*y*

^{*}

*z*

*x*

^{*}

*y*=

*z*

*z*=

*y*/

*x*

⇒ In RAM, all the information can be obtained at the output with

minimum time delay

unequal time delay

nearly identical time delay

maximum time delay

⇒ The current through common emitter resistor of a differential amplifier is called

differential current

emitter current

ground current

tail current

⇒ In all pure metals, temperature coefficient of resistance is positive.

TRUE

FALSE

⇒ (62)

_{10}in binary system is

110000

111100

111110

111111

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

A

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1 << A

_{v}→ ∞

A

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A

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⇒ In a loss-free R-L-C circuit the transient current is

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square wave

sinusoidal

non-oscillating

⇒ The slope of log magnitude curve changes by - 40 dB/decade at a certain frequency and the error between asymptote and actual curve is positive. This means that

a double pole is present

a pair of complex conjugate poles is present

either (a) or (b)

neither (a) nor (b)

⇒ In broadcast television, the number of lines per frame is chosen to be odd number to

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improve resolution

reduce peak power requirement

make interlacing easier

⇒ In admittance parameter set, the dependent variables are the currents at the two ports.

TRUE

FALSE

⇒ As frequency is increased, the skin effect

increases

decreases

remains the same

either (b) or (c)

⇒ The circuit given below

counter

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two-bit series-to-parallel converter

analog-to digital converter

⇒ For F

_{2}layer the critical frequency is about

500 MHz

100 MHz

25 MHz

10 MHz

⇒ The core of a solenoid is made of material of relative permeability μ

_{r}. A small cavity area

*d*A and length

*dl*is cut in the core. If it is desired that flux density in the cavity should be equal to B

_{0}

the fields inside and outside the cavity must be equal

the field inside the cavity must be made stronger than field outside the cavity

the field inside the cavity must be made weaker than the field outside the cavity

none of the above

⇒ Out of the following memory types, one that is volatile is

ferrite-core

semiconductor RAM

semiconductor ROM

magnetic disc

⇒ Which is correct for a transfer function?

The poles and zero must be complex

If the poles and zeros are complex or imaginary, they must be conjugate

If the poles and zeros are complex they must be simple

If a zero is imaginary, it must be simple

⇒ 9's complement of 56

_{10}is

43

_{10}

84

_{10}

65

_{10}

53

_{10}

⇒ Consider the following statements in connection with CMOS inverter in figure where both the MOSFET are of enhancement type and both have a threshold voltage of

Only statement 1 is true

Only statement 2 is true

Both the statement are true

Both the statements are false

⇒ The power required to produce a gain of 10 dB over 4 W of original power is __________ watt.

80

40

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⇒ System satellites orbit the Earth once in

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1 hours

6 hours

⇒ In the given figure the reflected voltage wave after first reflectio

18 V

-18 V

30 V

-30 V