Paper 3 Rn June 2014

Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) RN JUNE 2014 1. Inspect junction boxes of Radio systems for _____ of cover and sides, internal shorts due to distortion of the box, absence of stray metallic objects etc. a.

Oil caning

b. Oil scaning c.

Improper geometry where wires enters the box.

d. Fuel caning 2. Terminal Strips which provide connection of radio and electronic systems to the aircraft electrical system, are to be inspected for: a.

Loose connections

b. Loose connection with grease accumulation c.

Metallic objects which may have fallen across the terminal strip

d. All of the above 3. Radio equipment should be bonded to the aircraft in order to provide provide a.

High impedance ground

b. Low leakage current c.

Low impedance ground

d. Increase radio interference from static electricity charges

4. When the jumper is used for radio noise preventiononly a resistance of ___ ohm is satisfactory: a.

0.01 ohm

b. 0.001 ohm c.

1.0 ohm

d. 1 to 2 ohms

5. Bonding jumper – jumper – 0.0003 0.0003 ohms 6. Precipitation static is caused by: 7. Solvents should not be used on radome because: 8. Error , caused by metal in the fuselage wings and results in azimuth reading inaccuracies, 9. After installation of the loop, check the direction of radio bearing every___ degrees. 10. MTCS a.

Static dischargers are installed on aircraft to bleed off precipitation static after the potential reaches the corona threshold.

b. Before corona threshold. c.

They are installed only at the extremities of the aircraft.

d. Only null field type of static dischargers are installed on aircrafts.

11. MTCS WRT protective devices used during radio installation

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Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) a.

Incorporate a trip free resettable type CB.

b. Select CB or fuses that will provide adequate protection aginst overloading c.

Connect all the leads in such a manner that the master switch of the aircraft will interrupt the circuit when the master switch is o pened.

d. All of the above.

12. MTCS WRT bonding of radio equipment: a.

Use recommended solder to attach bonding jumpers.

b. Use of clamps and screws to be avoided while attaching bonding jumpers. c.

Use brass or bronze jumpers on steel parts.

d. Use cadmium plated copper jumpers on steel parts.

13. In addition to impedance matching, isolation between VOR Navigation Navigation receivers while keeping the insertion losses at a mi nimum is done by a device called a.

Multiplexer

b. Diplexer c.

Coaxial Tee connector

d. Crimp type contact.

14. Optimum performance of a radio system is dependent upon: a.

Coaxial cable connector assembly

b. Transmission line. c.

Typical dipole antenna assembly.

d. Coaxial cable centre lead tinning.

15. Optimum ADF performance is achieved when a.

‘L’ rather than ‘T type of antenna is used.

b. The T type of antenna has noise cancelling effect. c.

The ‘L’ type produces a definite station passage indication.

d. The ‘T’ type of antenna has the directional characteristics.

16. Thermal runway in transistor occurs when: 17. Purpose of coupling capacitor in a transistor is: 18. Over modulation occurs when: 19. Radio receiver amplifies all the signal frequency very well , it has : a.

Blocking

b. Fidelity c.

Sensitivity


Aviation World (www.dgcaquestionpapers.blogsp (www.dgcaquestionpapers.blogspot.com) ot.com) d. Selectivity. 20. PTT 21. Mosfet is sometimes call ___ JFET 22. SCR can exercise control over ___ of A.C. supply a.

Positive

b. Negative c.

Both Positive & Negative

d. Positive or Negative

23. Duality principle in Boolean expression 24. Fly By Wire 25. Star— Star—Star connection 26. M Array— Array—0.3 27. BJT operates in cut off region: 28. Major part of electrons in an intrinsic i ntrinsic semiconductor is due to : to : 29. No reply: P1< P2— P2—9DB 30. EGPWS: which mode gives wind shear warning 31. Global Nav System 32. Doppler Navigation

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Paper 3 Rn June 2014

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