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Q1. | Radar is essentially an echo ranging system |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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

⇒ Some features of advanced mobile phone service are

- To provide telephone communication to a large number of telephone users within the area of a metropolitan only
- To use minimum amount of frequency spectrum
- To permit hand held as well as vehicle operation of telephone

1 and 2 only

1, 2, 3

1 and 3 only

2 and 3 only

⇒ If B, H and M denote flux density, field intensity and magnetisation, B = μ

_{0}(H + M).

TRUE

FALSE

⇒ The conductivity of germanium increases by about 6 percent per degree increase in temperature.

TRUE

FALSE

⇒ Inputs A and B of the given figure are applied to a NAND gate. The output is

from 0 to 6

from 0 to 2

from 0 to 1 and 2 to 3

from 1 to 2 and 3 to 4

⇒ The resistance of series field winding is a low resistance.

TRUE

FALSE

⇒ The eigen values of a skew symmetric matrix are

always zero

always pure imaginary

either zero or pure imaginary

always real

⇒ Number of cards read per minute by a card reader may be of the order of

20

1

10000

300

⇒ The resistance of a metallic wire would

increase as the operating frequency increase

decrease as the operating frequency increase

remain unaffected on increasing the operating frequency

first increase then decrease

⇒

Match the following:

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

A. | Anderson Bridge | 1. | Low resistance |

B. | Kelvin Bridge | 2. | Medium resistance |

C. | Schering Bridge | 3. | Inductance |

D. | Wheatstone Bridge | 4. | Capacitance |

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

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

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

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

⇒ Which one of the following is also called 'rat race'?

E plane tee

H plane tee

Magic tee

Hybrid ring

⇒ Accurate amplitude measurements can be made more easily than accurate phase shift measurements.

TRUE

FALSE

⇒ In the given circuit, the switch is open for a long time. At time

*t*= 0, the switch is closed. What are the initial and final values of voltages across the induc

0 V and 0 V

0 V and 80 V

80 V and 0 V

80 V and 80 V

⇒ Consider the following statements regarding electro-dynamometer type indicating instrum

1 and 2 are corect

3 and 4 are correct

1 and 3 are correct

1, 2, 3, 4 are correct

⇒ In the given figure the E and H lines in a coaxial c

The radial lines are E lines and circular lines are H lines

Radial lines are H lines and circular lines are E lines

The directions of E and H lines are wrong

Radial lines may be E and H lines depending an direction of current

⇒ What binary number does second row represent?

1111001

1010101

10101010

11101010

⇒ In 8085, F register has 8 bits.

TRUE

FALSE

⇒ A source generates three symbols with probabilities 0.25, 0.25, 0.50 at a rate of 3000 symbols per second. Assuming independent generation of symbols, the most efficient source encoder would have average bit rate is as

6000 bits/sec

4500 bits/sec

3000 bits/sec

1500 bits/sec

⇒ Which of the following is high frequency transmission line?

An impedance transformer

Frequency compensator

Flying resistor

None of the above

⇒ In radar PRF depends on maximum range.

TRUE

FALSE

⇒ Divergence of curl A is

∇ . (∇ x A) = 1

∇ . (∇ x A) = 0

∇ . (∇ x A) = ∇

∇ . (∇ x A) = - ∞

⇒ The circuit in figure, the switched on at

*t*= 0. After a long time the current through 5 Ω resistanc

0.0416666666666667

0.166666666666667

0.416666666666667

0

⇒ E-mail can be used to send text, graphics, and video.

TRUE

FALSE

⇒ In LED the radiation is in

visible region

infrared region

both (a) and (b)

neither (a) nor (b)

⇒ As compared to dimensions of most feeds, the skin depth at microwave frequencies is

of the same magnitude

much larger

much smaller

either (b) or (c)

⇒ At a frequency less than the resonant frequency

series circuit is inductive and parallel circuit is capacitive

series circuit is capacitive and parallel circuit is inductive

both circuits are capacitive

both circuits are inductive

⇒ In the human eye, an image persists for a time of about

1 second

0.1 second

0.05 second

0.02 second

⇒ Consider the following sets of values of E, R and C for the circuit in the given fig

1 and 4

1 and 2

3 and 4

2 and 3

⇒ A P-N junction diode dynamic conductance is directly proportional to

the applied voltage

the temperature

its current

thermal voltage

⇒ At resonance, the parallel circuit constituted by an iron-cored coil and a capacitor behaves

open circuit

short circuit

pure resistor of value R

pure resistor of value much higher than R

⇒ The sum of positive real function is positive real.

TRUE

FALSE