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Q1. | When an electromagnetic wave travelling in one medium strikes upon a second medium (having a different conductivity) the wave will be |

A. | totally transmitted [Wrong Answer] |

B. | totally reflected [Wrong Answer] |

C. | neither transmitted nor reflected [Wrong Answer] |

D. | partially transmitted and partially reflected [Correct Answer] |

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

⇒ The problem of logic race occurs in

SOP functions

POS functions

Hybrid function

SOP and POS functions

⇒ The range of value "

*a*" for which system will be stable. If impulse response of DT system is =

*a*

*∪[*

^{n}*n*]

*a*> 1

*a*< 1

1 <

*a*< ∞

-1 <

*a*< 1

⇒ Current through a charging capacitor exhibits

an exponential growth function

an exponential decay function

a step decay function

a linear decay function

⇒ A PIN diode can be used

as a shunt mounted switch

as a series mounted switch

both as series or shunt mounted switch

non of the above

⇒ A microprocessor can understand instruction written in

machine language only

mnemonics operation codes only

high language only

both machine language and mnemonics operation codes

⇒ The modulation index is, if

*f*= 500 Hz, Δ

_{m}*f*= 2.25 kHz

2.25

4.5

9

18

⇒ In phase modulation, the phase deviation is

proportional to the amplitude of the signal and varies with frequency

remains constant while amplitude and frequency of signal varies

proportional to the amplitude of the signal and independent of the frequency

none of the above

⇒ Earth's curvature affects the effective height of antenna.

TRUE

FALSE

⇒ The current through the coil of an electromagnet is doubled. The magnetic field around the coil

is halved

is doubled

becomes four times

remains the same

⇒

Match the following:

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

A. | LED | 1. | Heavy Doping |

B. | Avalanche Photodiode | 2. | Coherent Radiation |

C. | Tunnel diode | 3. | Spontaneous Emission |

D. | LASER | 4. | Current gain |

A-2, B-4, C-3

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

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

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

⇒ Companding is used

to overcome quantising noise in PCM

in PWM receivers to reduce impulse noise

to protect small signals in PCM from quantising noise

none of the above

⇒ Which of these commutation methods uses an external pulse for commutation?

Class A

Class C

Class E

Class F

⇒ Cross-over distortion behaviour is a characteristic of

class A output stage

class B output stage

class AB output stage

common base output stage

⇒ A network contains only independent current source and resistors. If the values of all resistors are doubled, the value of the node voltage

will become half

will remain unchange

will become one third

cannot be determined unless the circuit configuration and the values of the resistors are known

⇒ The amplitude of a random signal uniformly distributed between - 5 V and 5 V. If the positive values of the signal are uniformly quantized with a step size of 0.05 V, and the negative values are uniformly quantized with a step size of 0.10 V, the resulting signal to quantization noise is approximately

46 dB

43.8 dB

42 dB

40 dB

⇒ The sampling frequency in CD is 10 kHz.

TRUE

FALSE

⇒

Match the following:

List I (Diode Rectifier) | List II (Efficiency is R_{f}/R_{L} = 0.25) | ||
---|---|---|---|

A. | Half wave | 1. | 0.54 |

B. | Bridge Rectifier | 2. | 0.65 |

C. | Full wave using tapped centre transformer | 3. | 0.325 |

A-1, B-2, C-3

A-2, B-1, C-3

A-3, B-2, C-1

A-3, B-1, C-2

⇒ Which of the following are useful in comparing the noise performance of receivers?

- Input noise voltage
- Noise figure
- Noise resistance
- Noise temperature

1, 2 and 3

1, 3 and 4

2, 3, 4

1, 2, 4

⇒ A 2 bit BCD D/A converter is a weighted resistor type with E

_{R}= 1V, R = 1 MΩ and R

*= 10KΩ then Resolution in percent and volt is __________ .*

_{f}1%, 1 mv

10%, 10 mv

10%, 1 mv

1%, 10 mv

⇒ -8 is equal to signed binary number

10001000

1000

10000000

11000000

⇒ A periodic voltage has following values for equal time intervals changing suddenly from one value to next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, - 5, - 10

42.2 V

19.098 V

38.2 V

none of these

⇒ Find equivalent capacitance if each capacitance is

5/12 F

12/5 F

6/5 F

5/6 F

⇒ A vertical wire of 1 meter length carries a current of 1 A at 10 MHz. The total radiated power is nearly

0.13 W

0.88W

7.3 W

73 W

⇒ In the decimal number 27, the digital 2 represents

2

20

0.2

200

⇒ When a CE transistor is cut off

voltage across collector reduces to zero

voltage across collector is maximum

maximum collector current flows

maximum voltage appears across the load resistance

⇒ The system of the given fi

is unstable for all values of K

is stable for all values of K

can be stable for some values of K

data is insufficient to determine stability

⇒ Which of the following theorems can be conveniently used to find power consumed in 10 Ω resistor in fig

Thevenin theorem

Maximum power transfer theorem

Millman's theorem

Superposition theorem

⇒ In the integer expression

`- A * B div C + D`

which operation is done first in Pascal-

*

div

+

⇒

Match the following:

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

A. | Fourier transform of a Gaussian function | 1. | Gaussian function |

B. | Convolution of a rectangular pulse with itself | 2. | Rectangular pulse |

C. | Current through inductor for step input voltage | 3. | Triangular pulse |

4. | Ramp function | ||

5. | Zero |

A-1, B-2, C-3

A-2, B-4, C-5

A-1, B-3, C-4

A-2, B-3, C-5

⇒ Double integration of unit step function leads to

an impulse

a parabola

a ramp

a doublet