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Q1. | Cassegrain feed is used with a parabolic reflection to |

A. | reduce the size of the main reflector [Wrong Answer] |

B. | increase the gain of the system [Wrong Answer] |

C. | increase the beamwidth of the system [Wrong Answer] |

D. | allow the feed to be placed at a convenient point [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ The minimum gate current which can turn on SCR is called :

trigger current

holding current

junction current

breakover current

⇒ The dimensions of force are

MLT

^{-2}

ML

^{-1}T

^{-2}

MLT

^{-1}

ML

^{2}T

^{-2}

⇒ Consider the following statements about loop antenna

- It is suitable for direction finding application
- It is a single turn or multiturn coil carrying RF current
- The loop is surrounded by a magnetic field everywhere perpendicular to the loop

1 and 2 only

1 only

1, 2, 3

2 and 3 only

⇒ In a certain inverter circuit each thyristor carries 26.67 A for 60°, 13.33 A for 120° and zero A for 180° of the cycle. The rms current of thyristor is

20 A

13.33 A

6.67 A

3.33 A

⇒ Indium, aluminium, arsenic are all

*p*type impurities.

TRUE

FALSE

⇒ It is desired to couple a coaxial line to a two parallel wire line. It is best to use

quarter wave transformer

balun

slotted line

directional coupler

⇒ LET JCOKE = 11 and LPEPSI = 19. Consider the statement

16

9

14

⇒ In a dynamometer 3 phase power factor meter, the planes of the two moving coils are at

60°

0°

120°

90°

⇒ An instruction using immediate addressing mode in 8085 is

2 bytes long

3 bytes long

2 or 3 bytes long

1 or 2 or 3 bytes long

⇒ In a half bridge inverter each thyristor is gated at a frequency

*f*. The output frequency is

2

*f*

*f*

0.5

*f*

0.25

*f*

⇒ A two branch parallel tuned circuit has 100 Ω resistance and 0.1 H inductance in one branch and 10

^{-6}F capacitor in the other. At resonance frequency, the dynamic resistance is

10 Ω

100 Ω

1000 Ω

10000 Ω

⇒ How many and what are the machine cycles needed for execution of MOV D, C?

1, Fetch

2, Fetch and Memory Read

2, Memory Read and Memory write

2, Fetch 4 Bus idle

⇒ Which of the following directives in 8085 causes one byte to be reserved in the memory?

D S

D B

D W

E Q U

⇒ In a crystal

the frequencies of series and parallel resonance are equal

the frequency of series resonance is more than frequency of parallel resonance

the frequency of parallel resonance is more than frequency of series resonance

None of the above

⇒ In which of the following logical group instructions of 8085 is the addressing mode 'immediate'?

`ANA `*r*

`ANA M`

`ANI data`

`XRA `*r*

⇒ What does the B register contain after the first MOV B, A has been executed?

40 H

60 H

80 H

80 D

⇒ A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. The frequencies present in the output will be

998 kHz and 1002 kHz

998 kHz, 999.2 kHz, 1000.8 kHz, 1002.0 kHz

998 kHz, 999.2 kHz, 999.7 kHz, 1000.3 kHz, 1000.8 kHz and 1000.2 kHz

none of the above

⇒ In a half bridge inverter, the freewheeling diodes are needed

even when load is resistive

only when load is inductive

only when load is inductive or capacitive

for all types of loads

⇒ The polar plot of P (

*j*ω) = 45° as ω varies from -∞ to ∞ is

a straight line parallel to

*x*-axis

a straight line parallel to

*y*-axis

a line passing through origin and inclined at 45°

a line in first quadrant passing through origin and inclined at 45° to positive

*x*-axis

⇒ Which camera tube has gamma of almost unity?

Vidicon

Plumbicon

New vicon

Saticon

⇒ In a minimum function

the degree of numerator is higher than that of denominator

the degree of numerator is lower than that of denominator

the degree of numerator and denominator are equal

the denominator is a constant

⇒ The coupling capacitor mainly affects

bandwidth

lower cut-off frequency

higher cut-off frequency

both lower as well as higher cut-off frequency

⇒ Volt is equivalent to

joule/coulomb

joule/watt

joule/ampere

joule/volt

⇒ The reflection coefficient on a line is 0.2 ∠45°. The SWR is

0.8

1.1

1.2

1.5

⇒ A signal is

*x*+

*f*(

*t*) where

*x*is constant and

*f*(

*t*) is a power signal with zero mean value. The power of the signal is

*x*

^{2}

*x*

^{2}+

*f*

^{2}(

*t*)

more than

*x*

^{2}+

*f*

^{2}(

*t*)

less than

*x*

^{2}+

*f*

^{2}(

*t*)

⇒ A memoryless source emits

*n*symbols each with a probability

*p*. The entropy of the source as a function of

*n*

increases as log

*n*

decreases as log (1/

*n*)

increases as

*n*

increases as

*n*log

*n*

⇒ For a MOS capacitor fabricated on a P-type semiconductor, strong inversion occurs when

surface potential is equal to Fermi potential

surface Potential is greater than Fermi potential

surface potential is -

*ve*and equal to Fermi potential in magnitude

surface potential is +

*ve*and equal to twice the Fermi potential

⇒ In paramagnetic materials

permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible

permanent magnetic dipole do not exist

permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong

permanent magnetic dipole moment may or may not exist

⇒ For the discrete time system of the given fig

*y*= 0.5

_{k}*u*-

_{k - 2}*u*- 0.25

_{k}*y*- 1

_{k}*y*= 0.5

_{k}*u*

_{k}_{ - 1}-

*u*- 0.25

_{k}*y*- 1

_{k}*y*= 0.5

_{k}*u*

_{k}- u_{k}_{ - 1}- 0.25

*y*- 1

_{k}*y*= 0.5

_{k}*u*

_{k}_{ - 1}-

*u*

_{k}_{ - 1}- 0.25

*y*- 1

_{k}⇒ The input voltage for starting oscillations in an oscillator is caused by

negative feedback

positive feedback

noise voltage in resistors

a special generator