Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | Virtual height of an ionospheric layer is always greater than its actual height. |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒

Match the following:

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

A. | Sky wave | 1. | parasitic elements |

B. | Antenna feed | 2. | delta match |

C. | Reflector | 3. | long-wire antenna |

D. | Rhombic antenna | 4. | ionosphere |

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

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

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

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

⇒ Steady state conditions are considered to be achieved in

*R-L*circuits at the end of __________ time constant.

one

two

four

five

⇒ In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 25 MHz will be

24.09 MHz

24.54 MHz

25.45 MHz

25.91 MHz

⇒ The function of interface circuit is

to match output conditions of driver with input conditions of load device

to match output conditions of load device with input conditions of driver

both (a) and (b)

neither (a) nor (b)

⇒ An 8 bit binary number is to be entered into an 8 bit serial shift register. The number of clock pulses required is

1

2

4

8

⇒ Spot the odd one out

aluminium

silver

porcelain

copper

⇒ Thyristors are suitable for dc circuit breakers but not for ac circuit breakers.

TRUE

FALSE

⇒ If the mantissa has a sign bit of 0 and the exponent is changed from a negative number to a more positive number the result is

a positive number and closer to zero

a positive number and away from zero

a negative number

a negative number and closer to zero

⇒ Eddy currents are essential for the deflecting torque of an induction wattmeter.

TRUE

FALSE

⇒ In the given figure,

(A + B)C + DE

AB + C(D + E)

(A + B)C + D + E

none of the above

⇒ When a vector has positive divergence, it indicates that the vector quantity has at that point and if the divergence is negative, it indicates __________ .

source, sink

sink, source

positive value, negative value

negative value, positive value

⇒ The system of linear equations 4x + 2y = 1 , 2x + y = 6 has

a unique solution

no solution

an infinite number of solutions

exactly two distinct solutions

⇒ Which one of the following theorem can be conveniently used to calculate the power consumed by the 10 Ω resistor in the network shown in the above fig

Thevenin's theorem

Maximum power transfer theorem

Millman's theorem

Superposition theorem

⇒ Which of the following is the least important consideration while selecting a logic technology?

Power dissipation

Noise immunity

Number of pins

Cost

⇒ The current distribution along a travelling wave antenna can be written in the form

*f*(

*z*) =

*f*

_{0}e

^{-jβz}

*f*(

*z*) =

*f*

_{0}sin β

_{z}

*f*(

*z*) =

*f*

_{0}

*f*(

*z*) =

*f*

_{0}cos (ω

*t*- β

_{z})

⇒ One of the advantages of base modulation over collector modulation in a class C transistor amplifier is

higher efficiency

more linear operation

more power output per transistor

lesser requirement of modulating power

⇒ The open loop gain of an amplifier is 200. If negative feedback with β = 0.2 is used, the closed loop gain will be

200

40.12

4.878

2.2

⇒ In the circuit of figure the current through 5 Ω resistance at

*t*= 0

^{+0.1666666666666672.5 A3.1 A0}

⇒ In 8085

P flag is set when the result has even parity

P flag is set when the result has odd parity

P flag is reset when the result has odd parity

P flag is reset when the result has even parity

⇒ A real number consists of

integer part

integer part and fraction part

integer part, fraction part along with positive or negative sign

none of the above

⇒ Inverters find applications in

HVDC transmission

UPS

variable speed ac drives

all of the above

⇒ For a wave propagating in air filled rectangular waveguide.

guide wavelength is never less than free space wavelength.

wave impedance is never less than the free space impedance

TEM mode is possible if the dimension of the waveguide are properly chosen.

propagation constant is a real quantity.

⇒ In a transistor push pull amplifier

there is no dc present in the output

there are no even harmonics in the output

both (a) and (b)

neither (a) nor (b)

⇒ If short-circuited and open circuited impedances are 5 ohms and 20 ohms, then characteristic impedance is

1 ohms

10 ohms

25 ohms

100 ohms

⇒ Which of the following Boolean Expression correctly represents the relation between P, Q, R and M

_{1M1 = (P OR Q) XOR RM1 = (P AND Q) XOR RM1 = (P NOR Q) XOR RM1 = (P XOR Q) XOR R}

⇒ DC servomotors are, generally

permanent magnet dc motors

shunt field motors

separately excited dc motors

none of the above

⇒ The input impedance for folded dipole antenna (two half dipole) is

73

*n*

^{2}

377

*n*

^{2}

73

*n*

377

*n*

⇒ If figure, I = 2A if R = 20 Ω. When R = 10 Ω current I

0.0416666666666667

0.0833333333333333

2.5 A

0.125

⇒ When duct propagation exists

the line of sight and diffraction. Zone concepts are payable

the line of sight and diffraction zone concepts are not applicable

line of sight concept is applicable but diffraction zone concept is applicable

diffraction zone concept is not applicable but line of sight concept is not applicable

⇒ Which of the following circuit can operate class AB for audio power output?

Push pull

Cascade

Pull down

Darlington pair