RadioComm

(8661) Installed radio equipment is protected from damage due to jolts and vibration by

• a. shock mounts.

• b. spring and/or viscous damper mounted racks.

• c. rubber or foam cushioning material between circuit chassis and case.

(8673) Static dischargers help eliminate radio interference by dissipating static electricity into the atmosphere at

• a.   low current levels.

• b. high voltage level.

• c. high current levels.

(8668) An emergency locator transmitter (ELT) battery must be capable of furnishing power for signal transmission for at least

• a. 36 hours

• b. 48 hours.

• c. 72 hours.

(8667) When must the emergency locator transmitter (ELT) battery be replaced (other than reading the replacement date)?

• a. When the transmitter has been in use for more than one cumulative hour.

• b. Must be replaced annually or if the five G switch has been activated.

• c. When the transmitter has been tested more than ten times.

(8666) When installing coaxial cable, it should be secured firmly along its entire length

• a. at 1-foot intervals.

• b. wherever the cable sags.

• c. at 2-foot intervals.

(8662) (1) Use solder to attach bonding jumpers on radio equipment.

(2) Radio equipment is bonded to the aircraft in order to provide a low- impedance ground and to minimize radio interference from static electrical charges.

Regarding the above statements,

• a. only No. 1 is true.

• b. both No. 1 and No. 2 are true.

• c. only No. 2 is true.

(8682) Doublers are used when antennas are installed to

• a. eliminate antenna vibration.

• b. prevent oil canning of the skin.

• c. reinstate the structural strength of the aircraft skin.

(8691) When bending coaxial cable, the bend radius should be at least

• a.   10 times the diameter of the cable.

• b. 15 times the diameter of the cable

• a.   20 times the diameter of the cable.

(8676) VHF radio signals are commonly used in:

• a. ATC communications.

• b. VOR navigation.

• both VOR navigation and ATC communications

(8675) An aircraft antenna installation must be grounded

• a. to the airframe

• b. to the engine.

• c. to the radio rack.