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Q1. | Refraction of electromagnetic waves occurs when they |

A. | pass through a small slot in a conducting plane [Correct Answer] |

B. | pass into a medium of different dielectric constant [Wrong Answer] |

C. | are polarized at right angles to the direction of propagation [Wrong Answer] |

D. | encounter a perfectly conduction surface [Wrong Answer] |

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

⇒ 24 telephone channels, each band limited to 3.4 kHz, are to be time division multiplexed by using PCM, calculate the bandwidth of PCM system for 128 quantization levels and an 8 KHz sampling frequency

192 kHz

2 MHz

1.299 MHz

1.54 MHz

⇒ The pole-zero plot given below corresponds

low pass filter

high pass filter

band pass filter

notch filter

⇒ If the number of information bits is m, the number of parity bits p in the Hamming code is given by equation

2

^{p}= m + p + 1

2

^{p}≥ m + p + 1

2

^{P}= m + p

2

^{p}≥ m + p

⇒ An FM signal with a deviation δ is passed through a mixer, and has its frequency reduced 5 fold. The deviation in the output of the mixer is

5/δ

Intermediate

δ/5

δ

⇒ If the average power of radar transmitters is 2 kW and the peak power of the transmitter is 1000 kW, what will be the duty cycle?

0.002

0.02

0.001

0.01

⇒ A folded dipole antenna is conveniently connected to

shielded line

two wire line

coaxial line

flat ribbon type transmission line

⇒ A '

*n*' bit sequence generator employing SR flip-flop has maximum length of the sequence as :

2

^{n}*n*

2

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^{n}2

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⇒ The scale of hot wire instrument is linear.

TRUE

FALSE

⇒ If F(

*t*) = δ(

*t*-

*a*), F(

*s*)=

0

1

*e*

^{-as}

*e*

^{as}⇒ The pre-emphasis circuit is used

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after demodulation

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⇒ In a synchro transmitter, which coil acts as primary?

Rotor

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Tertiary

⇒ A dynamometer wattmeter can be used for

dc only

ac only

dc and 50 Hz ac

dc and high frequency ac

⇒

Match the following:

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

A. | Copper | 1. | produces discrete energy level just above valence band |

B. | Rubber | 2. | produces discrete energy level just below conduction band |

C. | Antimony | 3. | large forbidden gap |

D. | Boron | 4. | valence and conduction bands overlap |

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

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

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

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

⇒ The accumulator drives the ALU.

TRUE

FALSE

⇒ For a second order instrument, the optimum range of ξ (damping ratio), which gives good frequency response over a wide range of frequencies is

0.5 to 0.6

0.6 to 0.7

0.7 to 0.8

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⇒ Which one of the following circuits is used for converting a sine wave into a square wave?

Astable multivibration

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⇒ The opposition of an inductor to current flow

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depends on the magnitude of the applied voltage

varies directly with frequency

varies inversely with frequency

⇒ A sinusoidal voltage amplitude modulates a carrier of peak value 5 kV. Each side band has an amplitude of 500 V. The modulation index is

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0.2

0.4

0.8

⇒ Most of the communication satellites are stationed to the West of their service areas in order to reduce their

eclipse period

loss of power

battery power provision

mass of station-keeping fuel

⇒ A transistor has a power rating of 8 W for a case temperature of 25°C. If derating factor is 30 mW/°C, the power rating for 55°C, case temperature is

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7.5 W

7.1 W

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⇒ In a P-N-P transistor, with normal bias, the emitter junction

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offers very high resistance

offers a low resistance

remains open

⇒ In figure, the current supplied by battery at

*t*= 0.5

*s1.1 A*

1.9 A

0

1.632 A

1.9 A

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⇒ Consider the following amplifier with negative feed

-9 x 10

9 x 10

-11 x 10

11 x 10

⇒ A buffer amplifier is

a double-tuned amplifier

a high gain D.C. amplifier

a cathode follower stage

none of the above

⇒ The maximum theoretical efficiency for class A amplifier is

0.125

0.25

0.5

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⇒ Which binary addition is incorrect?

1101.1 + 1011.1 = 11001.0

101101 + 1101101 + 1100011

0.0011 + 0.1110 + 1.0001

1100.001 + 1011.011 = 10111.100

⇒ When analysing two port networks in cascade, it is more convenient to use

T parameters

⇒ The forms of IF statements in FORTRAN 77 are called

logical IF and Block IF

logical IF, block IF and arithmetic IF

logic IF, block IF, arithmetic IF and negate IF

logical IF and arithmetic IF

⇒ ∈

TRUE

FALSE

⇒ The encapsulation of transistor is necessary for

preventing radio interference

preventing photo-emission effects

avoiding loss of free electrons

mechanical ruggedness

⇒ Consider the following amplifier with negative feed

-9 x 10

^{-3}9 x 10

^{-3}-11 x 10

^{-3}11 x 10

^{-3}⇒ A buffer amplifier is

a double-tuned amplifier

a high gain D.C. amplifier

a cathode follower stage

none of the above

⇒ The maximum theoretical efficiency for class A amplifier is

0.125

0.25

0.5

0.75

⇒ Which binary addition is incorrect?

1101.1 + 1011.1 = 11001.0

101101 + 1101101 + 1100011

0.0011 + 0.1110 + 1.0001

1100.001 + 1011.011 = 10111.100

⇒ When analysing two port networks in cascade, it is more convenient to use

*z*parameters*h*parametersT parameters

*y*parameters⇒ The forms of IF statements in FORTRAN 77 are called

logical IF and Block IF

logical IF, block IF and arithmetic IF

logic IF, block IF, arithmetic IF and negate IF

logical IF and arithmetic IF

⇒ ∈

_{r}is determined by the atomic structure of the dielectric.TRUE

FALSE

⇒ The encapsulation of transistor is necessary for

preventing radio interference

preventing photo-emission effects

avoiding loss of free electrons

mechanical ruggedness