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Q1. | The frequency of oscillations obtained from a reflex klystron depends mainly on |

A. | resonant frequency of cavity [Correct Answer] |

B. | repeller voltage [Wrong Answer] |

C. | voltage of focussing electrode [Wrong Answer] |

D. | characteristics of cathode [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 :**

⇒ If

*f*

_{1}and

*f*

_{2}and half-power frequency and

*f*

_{0}be resonant frequency, the selectivity of R-L-C series circuit is given by

(

*f*

_{2}-

*f*

_{1})/2

*f*

_{0}

(

*f*

_{2}-

*f*

_{1})/

*f*

_{0}

(

*f*

_{2}-

*f*

_{0})/(

*f*

_{1}-

*f*

_{0})

(

*f*

_{2}-

*f*

_{1})/(

*f*

_{1}-

*f*

_{0})

⇒ Number of fundamental cut-sets of any graph will be

same as the number of twigs

same as the number of tree branches

same as the number of nodes

equal to one

⇒ Consider the following statements as regards advantages of CCD sensors as camera pick up tube

- High sensitivity
- Good spectral response
- Image lag absent

1, 2, 3

1, and 2 only

1 and 3 only

2 and 3 only

⇒ If we manage to __________ our natural resources, we would leave a better planet for our children.

uphold

restrain

Cherish

conserve

⇒ Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver?

Variable tuning inductor

Ganged tuning inductor

Variable capacitor

Variable preset

⇒ The colour of an object is decided by

the reflected colour

the wavelength transmitted through it

reflected colour for opaque object and wavelength transmitted through it for transparent objects

none of the above

⇒ Some of MOS families are PMOS, CMOS, the family dominating the LSI field, where low power consumption is necessary is

NMOS

CMOS

PMOS

both NMOS, CMOS

⇒ A stationary process has

all statistical properties independent of time

all statistical properties dependent of time

zero variance

ensemble average equal to time average

⇒ The sensitivity curve of a standard receiver is represente

curve A

curve B

curve C

curve D

⇒ In a circular waveguide with radius

*r*, the dominant mode is

TM

_{01}

TE

_{01}

TM

_{11}

TE

_{11}

⇒ Whenever a JFET operates above pinch-off voltage

depletion regions become smaller

drain current increase steeply

drain current starts decreasing

drain current remains nearly constant

⇒ The constant M loci on G(

*s*) plane are a family of circles.

TRUE

FALSE

⇒ Read the following statement

- Multi-processing operation permits highly efficient parallel processing at several levels.
- Multi processing involves use of several processing units jointly on a common program and severally on different programs.
- In multi-processing the assignment of facilities to tasks, loading of programs and monitoring of I/O activity is taken care of by operating system.

All

1 and 2 only

1 and 3 only

2 and 3 only

⇒ 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

⇒ It is desired to evaluate the expression

`F = B * COS (Y) + C * SQR (COS (Y) + A * COS (Y) * COS (Y) * COS (Y)`

`F = B * COS (Y) + C * SQR [COS (Y)] + A * COS (Y) * SQR [COS (Y)]`

`F = B * COS (Y) + C * COS(Y) * COS (Y) + A * COS (Y) * COS (Y) * COS (Y)`

` X = COS(Y)`

⇒ Computer virus is a piece of rough software of unknown origin that

copies itself like a breeding germ

spreads from one machine to another

eats away processing power

all of the above

⇒ In the given figure, A = B = 1 and C = D = 0. Then

1

0

either 1 or 0

indeterminate

⇒ A single phase full wave regulator feeds a resistive load. The firing angle of thyristors is 90°. The input power factor is

1

0.707 lagging

0.5 lagging

0.2 lagging

⇒ The electric breakdown strength is affected by

shape of the waveform of applied voltage

steepness of the wavefront of the applied voltage

composition of the material

all of the above

⇒ The output *y*(*t*) of a continuous-time system *S* for the input *x*(*t*) is given

S is linear and time-invariant

S is linear and time-varying

S is non-linear and time-invariant

S is non-linear and time-varying

⇒ Consider the z-transform X(*z*) = 5*z*^{2} + 4*z*^{-1} + 3; 0 < |*z*| < ∞ The inverse transform *x*[*n*] is

5δ[*n* + 2] + 3δ[*n*] + 4δ[*n* - 1]

5δ[*n* - 2] + 3δ[*n*] + 4δ[*n* + 1]

5*u*[*n* + 2] + 3*u*[*n*] + 4*u*[*n* - 1]

5*u*[*n* - 2] + 3*u*[*n*] + 4*u*[*n* + 1]

⇒ Hay's bridge is suitable for inductances having low L/R ratio.

TRUE

FALSE

⇒ The use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load

current is high

current is low

voltage is high

voltage is low

⇒ RF amplifiers are used in radio receivers for

better sensitivity

improved signal-to-noise ratio

better coupling of receiver to the antenna

all of the above

⇒ Some features of RF stage in good radio receivers is - It increases sensitivity by providing amplification to RF signal
- It eliminates image frequency interference
- It increases selectivity
- It reduces noise level

Which of the above are true?

1, 2 and 3 only

1, 2 and 4 only

2, 3, 4 only

1, 2, 3, 4

⇒ Which one of the following is correct?

Coding reduces the noise in the signal

Coding deliberately introduces redundancy into messages

Coding increases the information rate

Coding increases the channel bandwidth

⇒ Parallel wire transmission line is an example of

lumped network

distributed

depend upon I/P signal strength

power I/P

⇒ A λ/8 section of transmission line is determined of load impedance of (2 - *j* 5) Ω. If characteristic impedance of line is 10 Ω. Then input impedance of line is

10 Ω

(6.9 + *j* 7.24) Ω

(1.75 + *j* 3.098) Ω

(2 - *j* 5) Ω

⇒ The useful magnetic flux obtainable from any closed surface is

unity

constant

both (a) and (b)

none of the above

⇒ In active filter circuits, inductances are avoided mainly because they

are always associated with some resistance

are bulky and unsuitable for miniaturisation

are non-linear in nature

saturate quickly

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