1) In magnetron the force of the magnetic field Report

Backward (radial) velocity of the electron

Radial velocity of the electron

Forward (radial) velocity of electron

2) As the electron approaches anode, its velocity continues to Report

Remain same & drifting

Increase & is radial

Slows down & drifting

3) Oscillations are capable of starting in device Report

Having high impedance

Increase & radial

Slow down & drifting

4) Self consistent oscillations can exit only if the Report

Difference between all the poles or cavity reasonators are equal to π/4

difference between the adjoining poles is nπ/4 (where n is an constant)

difference between the adjoining poles is nπ/4 (where n is an integer)

5) The secret of oscillation in magnetron Report

All cavities are turned to its frequency

Each cavity acts in the same way as a short circuited quarter wave transmission line

But as open circuit quarter wave transmission line

6) Each gap between the resonators corresponds to Report

Maximum voltage points

In the resulting standing wave pattern

Both (i) and (ii)

7) Tangential component of RF electro field is due to Report

Presence of axial magnetic field

Presence of DC anode voltage

Oscillations in the magnetron

8) Back heating caused by electron 'b' is an loss of Report

5 % of energy

10 % of energy

1 % of energy

9) Cavity magnetron is also called Report

Traveling-wave magnetron

Back-ward wave magnetron

both (i) and (ii)

10) Mode jumping takes place in Report

Magnetron

Klystron

Traveling wave tube

11) To prevent mode jumping, employ Report

Turning of frequency

Stapping

Lowering the output impedance

12) Frequency pushing is caused by Report

change in anode voltage

Due to alternation of orbital velocity of electron clouds

both (i) & (ii)

13) Megnetron can also be Report

Impedance tuned

Voltage tuned

Both (i) & (ii)

14) Frequency variation due to change in load is called Report

Frequency pulling

Frequency Pushing

Both (i) & (ii)

15) Most common type of magnetron available Report

Co-axial magnetron

Frequency agile magnetron

All the above

16) Duty cycle of magnetron Report

1.0 percent

1.05 percent

0.1 percent

17) Maximum power available Report

UHF - 10 MW, 2 MW-x band. 10 KW - 100 GHZ

1000W VHF. 1 MW. 100 GHZ. 3 MW. x band

2 MW. S band 30 MW. VHF 10 KW 100 GHZ

18) The 180� - phase difference between adjacent pole is maintained by operating magnetron in Report

π/4 mode

π A/2 mode

π mode

19) The force of the magnetic field on electron in magnetron will depend on: Report

Forward velocity of the electron

Resultant velocity of electron

Forward (Radial) velocity of electron

20) The magnetic field require to return electrons to the cathode after they have just grazed the anode is called Report

Saturated field

Optimum field

Cut off field

EASA Questions Radio Nav. Set 5

Set 1

Set 2

Set 3

Set 4

Set 5

Set 6

Set 7