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. | In a directional coupler |

A. | isolation (dB) equals coupling plus directivity [Correct Answer] |

B. | coupling (dB) equals isolation plus directivity [Wrong Answer] |

C. | directivity (dB) equals isolation plus coupling [Wrong Answer] |

D. | isolation (dB) equals (coupling) (directivity) [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 :**

⇒ Two identical silicon diodes D

_{1}and D

_{2}are connected back to back shown in figure. The reverse saturation current

*I*

_{s}of each diode is 10

^{-8}amps and the breakdown voltage V

_{Br}is 50

*v*. Evaluate the voltages V

_{D1}and V

_{D2}dropped across the diodes D

_{1}and D

_{2}assuming KT/

*q*to be 25

4.983 V, 0.017 V

- 4.98 V, - 0.017 V

0.17 V, 4.983 V

- 0.017 V, - 4.98 V

⇒ In

*n*-well CMOS fabrication substrate is:

heavily doped

*n*-type

heavily doped

*p*-type

lightly doped

*n*-type

lightly doped

*p*-type

⇒ If ω

_{0}is the angular frequency of rotation of electron in the absence of magnetic field, the angular frequency ω, when a magnetic field B is acting is ω ≅ ω

_{0}+ (

*e*/2

*m*)B.

TRUE

FALSE

⇒ In figure, the voltmeter is ideal. The transformer has two identical windings with perfect coupling. The reading of voltmete

440 V

220 V

110 V

zero

⇒ A short grounded vertical antenna has a length L which is 0.05λ at frequency

*f*. If its radiation resistance at

*f*is R ohms, then its radiation resistance at a frequency 2

*f*will be

R/2Ω

RΩ

2RΩ

4RΩ

⇒ Ground wave can be used for communication upto

5 kHz

12 kHz

16 kHz

25 kHz

⇒ The threshold voltage of an n-channel enhancement mode MOSFET is 0.5 when the device is biased at a gate voltage of 3V. Pinch off would occur at a drain voltage of

1.5 V

2.5 V

3.5 V

4.5 V

⇒ An RLC series circuit is underdamped. To make it overdamped, the value of R

has to be increased

has to be decreased

has to be increased to infinity

has to be reduced to zero

⇒ A parabolic antenna produces a radiation pattern which is

circularly polarized

highly directional

omnidirectional

linearly polarized

⇒ A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10

*n*F capacitor in the second branch. At resonance frequency is

100 rad/sec

10000 rad/sec

1000 rad/sec

more than 10000 rad/sec

⇒ In which of the following frequency bands are the standard AM radio broadcast stations?

MF

HF

VHF

UHF

⇒ The maximum current and voltage ratings for a 0.5 W, 10 kW resistor are

7.07 mA and 70.7 V

70.7 mA and 70.7 V

0.707 mA and 70.7 V

7.07 mA and 70.7 x 10

^{3}V

⇒ Which of the following devices should be used for accurate measurement of a low dc voltage?

Small range moving coil voltmeter

Dc potentiometer

Small range thermocouple voltmeter

Hot wire instrument

⇒ If the drift velocity of holes under a field gradient of 100 V/m is 5m/sec. Their mobility is

0.05

0.5

50

500

⇒ A Weston frequency meter is

moving coil instrument

moving iron instrument

dynamometer instrument

induction instrument

⇒ The S (sign) flag is set when the contents of accumulator become negative during an operation.

TRUE

FALSE

⇒ For the K map of the given figure the simplified Boolean expressio

A B + A B

B

A

AB

⇒ Which of the following characteristic are necessary for a sequential circuit?

- It must have 6 gates
- It must have feedback
- Its output should depend on past value

1, 2, 3

1, 2

2, 3

1, 3

⇒ The signal cos ω

*+ 0.5 cos ω*

_{c}t*sin ω*

_{m}t*is*

_{c}tFM only

AM only

both AM & FM

neither AM nor FM

⇒ In a transistor receiver, the use of FET as the first stage amplifier is likely to

improve selectivity of the receiver

improve the effectiveness of the AGC

reduce the effect of negative peak clipping

reduce the effect of noise at all frequencies

⇒ In a clocked NAND latch, race condition occur when

R and S are high CLK is low

R and CLK are high and S is low

R, S, CLK are high

R, S, CLK are low

⇒ In fi

the collector currents of T

_{1}and T

_{2}are equal

the collector current of T

_{1}is more than that of T

_{2}

the collector current of T

_{1}is double that of T

_{2}

the collector currents of T

_{2}is more than that of T

_{1}

⇒ Some types of traps used in video IF amplifier of colour TV are

shunt traps

series traps

absorption traps

all of the above

⇒ Consider the following program for 8085

`OACH`

`53 H`

`OADH`

`54 H`

⇒ Surge current rating of an SCR is

the maximum repetitive surge current in which the SCR can withstand

the maximum non-repetitive surge current in which the SCR can withstand

the maximum repetitive or non repetitive surge current in which the SCR can withstand

the maximum surge current in which the SCR can withstand if both surge current and steady current exist together

⇒ The gate lead, in a thyristor is welded to :

*p*layer to which anode is connected

*n*layer nearest to the anode terminal

*p*layer nearest to the cathode terminal

outside

*n*layer

⇒ The number of branches of root locus plot is equal to

the number of roots of characteristic equation

double the number of roots of characteristic equation

the number of roots of characteristic equation minus one

the number of roots of characteristic equation plus one

⇒ A typical microcomputer has 65, 536 registers in its memory. It will be specified as

65.536 memory

65.536 K memory

64 K memory

8 K memory

⇒ The value of the inductance of coil in which a current increases linearly from zero to 0.1A in 0.2 second producing a voltage of 5 volts is __________ .

2.5

5

10

20

⇒ Divergence of curl A is

∇ . (∇ x A) = 1

∇ . (∇ x A) = 0

∇ . (∇ x A) = ∇

∇ . (∇ x A) = - ∞