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Q1. | Which of the wave remains unaffected whether it is a day or night? |

A. | Sky wave [Wrong Answer] |

B. | Ground wave [Correct Answer] |

C. | Tropospheric wave [Wrong Answer] |

D. | Space wave [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒ While AM has __________ frequencies, FM has __________ number of sidebands.

2, 3

3, 3

3, 5

3, infinite

⇒ A NOR gate is a combination of

OR gate and AND gate

AND gate and NOT gate

OR gate and NOT gate

two NOT gates

⇒ Which device can detect the presence of both forward and backward waves in a waveguide?

Filter

Detector

Directional coupler

Magic T

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

ferrite-core

semiconductor RAM

semiconductor ROM

magnetic disc

⇒ High speed counter

ring counter

ripple counter

synchronous counter

asynchronous counter

⇒ The hexadecimal number given below represent decimal numbers which are multiples of DC, C8, BE, 46, IE

2

6

7

10

⇒ In using mesh current method it is necessary that at least one mesh current links every element.

TRUE

FALSE

⇒ ECL can be used to high frequencies in the order of

500 kHz

1 MHz

100 MHz

500 MHz

⇒ When a wave reaches the open circuited end of a line

all the forward energy is reflected by the open circuit

all the forward energy is absorbed by the open circuit

a small portion of energy is radiated into atmosphere and the remaining energy is reflected

either (a) or (b)

⇒

**Assertion (A):** In an op-amp the gain bandwidth product equals *f*_{finity}

**Reason (R):** The change in open loop gain of an amplifier has almost no effect on closed loop gain

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

⇒ A rectangular waveguide having TE

_{10}mode as dominant mode is having a cut off frequency of 18 GHz for the TE

_{30}mode. The inner broad wall dimension of the rectangular waveguide is

5/3 cm

5 cm

5/2 cm

10 cm

⇒ The gate width of a monostable multivibrator is given by

T = 1.1 RC

T = 0.693 RC

0.963 RC

T = 0.369 RC

⇒ Most of the transistor data sheets specify the power rating for an ambient temperature of

10°C

25°C

50°C

75°C

⇒ Which one of the following statement is correct?

Satellite spacing is not affected by the bandwidth of the transmitting earth station

Beamwidth is independent of antenna size and frequency band used

The width of a beam in space is inversely proportional to the width of the transmitting antenna

Use of high-frequency bands permits less number of satellites to share the orbit

⇒ A sheet of bakelite is inserted between the plates of an air capacitor. The capacitance will

increase

decrease

remain the same

may increase or decrease

⇒ In 2's complement form, - 2 is

1011

1110

1100

1010

⇒ In a ratio detector

the linearity is worse than in a phase discriminator

the output is twice that obtainable from a similar phase discriminator

stabilization against signal strength variations is provided

the circuit is the same as in a discriminator, except that the diodes are reversed

⇒

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

⇒ Octal 16 is equal to decimal

13

14

15

16

⇒ A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with e

*= 15. The reflection coefficient for normal incidence is*

_{r}0.6 ∠0°

1 ∠0°

0.6 ∠180°

1.2 ∠180°

⇒ A (75 -

*j*50) Ω load is connected to a coaxial line of Z

_{0}= 75 Ω at 10 GHz. The best method of matching consists of using

a capacitance at some specific distance from load

a short circuited stub at some specific distance from load

an inductance at load

a short circuited stub at load

⇒ Tesla is a unit of

flux

field strength

flux density

MMF

⇒ The sensitivity of electromagnetic digital flow meter can be increased by increasing

circumferential width of rotor teeth

radial depth of rotor teeth

thickness of rotor teeth

number of teeth

⇒ In TE and TM modes of rectangular waveguides having propagation in

*z*direction

E

_{z}and H

_{z}are both zero

In TE mode E

_{z}is zero and in TM mode H

_{z}is zero

In TE mode H

_{z}is zero and in TM mode E

_{z}is zero

In both TE and TM modes both E

_{z}and H

_{z}are non-zero

⇒ Which of the following is an indirect way of generating FM?

Armstrong modulator

Varactor diode modulator

Reactance FET modulator

Reactance bipolar transistor

⇒ A parallel resonant circuit can be used

as a high impedance

to reject a small band of frequencies

both (a) and (b)

to amplify certain frequencies

⇒ For a rectangular waveguide (

*a*x

*b*,

*a*>

*b*) to support only the TE

_{10}mode at wavelength which one of the following pairs of in equalities is to be satisfied?

*b*< λ < 2

*b*; λ > 2

*a*

*b*< λ < 2

*b*; λ < 2

*a*

*a*< λ < 2

*b*; λ < 2

*a*

*a*< λ < 2

*b*; λ > 2

*a*

⇒ The diameter and thickness of CD are

6 cm and 1.2 mm

6 cm and 0.6 mm

12 cm and 0.6 mm

12 cm and 1.2 mm

⇒ A universal shift register can shift left or right.

TRUE

FALSE

⇒ If

*q*is charge on an electron, R is radius of electron orbit and ω is angular velocity of electron rotation, the magnetic dipole moment of electron in orbit is

0.5

*q*ωR

0.5

*q*

^{2}ω

^{2}R

^{2}

0.5

*q*ωR

^{2}

0.5

*q*ω

^{2}R