3272-6 Har/Mat (6.12)

What is the danger if a silver coated connector comes into contact with glycol de icing fluid. Fire hazard. Corrosion. Wet arc tracking.

When silver coated connectors are used in unpressurised parts of the aircraft. wet track arcing can occur. separation of the coating can occur. corrosion can occur.

The conductor in Tersil cable is. stainless steel. nickel plated copper. tinned copper.

A cable is marked NYVIN 22. The 22 represents the. current/weight ratio. cross sectional area. current rating.

Copper is an inferior conductor to aluminium when comparing. weight for weight. CSA with CSA. load for load.

Silver plated copper wire has a maximum working temp of. 250 °C. 300 °C. 200 °C.

For an electrical cable to be fireproof it must be able to stand 1100 °C for. 20 mins. 10 mins. 15 mins.

Oxide on exposed silver plated wires is. non corrosive. a conductor. an insulator.

On a rear insert plug the tool is used to. insert the pins from the front and extracted from the rear. insert the pins from the rear and extract from the front. insert the pins from the rear and extract from the rear.

Nickel coated cables temperature range is. 200 to 250 °C. 150 to 200 °C. 100 to 150 °C.

Aluminium wiring when flexed will. have a higher resistance. have no effect. work harden and embrittle.

A foot operated hydraulic swaging tools is checked for fluid level. vertically. horizontally. only when operating pressure is reached.

On a hydraulic swaging tool, the swage is formed when. the bypass valve closes and ram is neutrally loaded. the bypass valve opens and ram is neutrally loaded. swage pressure is reached on the gauge.

Interference in ribbon cables can be prevented by. the use of a common earth return between signal wires in the cable. grounding alternate wires so that signal wires are never adjacent. using alternate return wires so that the cable differences cancel each other out.

H.T. leads are. multi-strand, single-core, screened. single-strand, single-core, screened. multi-strand, multi-core, screened.

If the cross sectional area of a cable is increased, what will happen to the voltage drop?. Decrease. Increase. Stay the same.

The cross sectional area of a copper crimp barrel is. larger than an aluminium one. smaller than an aluminium one. same as an aluminium one.

Electrical cable on aircraft is mainly made from copper because. it offers low resistance to current flow. it more malleable. it does not oxidise.

When crimping, what chapter in the ATA system should you refer to?. 20. 24. 12.

Interconnect cables. employ thinner insulation than airframe types. are used for equipment wire in the unified system. are the cable through the MEC to the engine.

The first step for the coaxial cable to attach to the end fitting is. use a tooling hold between the assembly and cable. the outer covering is cut back to expose the braided outer conductors. back-off the insulator and connect with conductor.

A fire resistant cable must maintain adequate insulation in a fire for. 10 minutes. 5 minutes. 30 minutes.

When silver coated connectors are used in unpressurised parts of the aircraft. wet track arcing can occur. red plague can occur. separation of the coating can occur.

Knuckling is a problem on earlier aircraft cables due to. hot stamping of cables. too much flux. wires being pulled through too hard.

Which of the following types of electrical wire is likely to be used for connection of thermo- couples around the jet-pipe of a turbine engine?. Nyvin. Tersil. Fepsil.

The main reason why crimped joints are preferable to soldered joints is. the quality of crimped joints will be constant. no flux is needed. there is no heat required.

Crimping terminals are colour coded. The colour indicates. the type of crimping tool to be used only. the wire size to be used with that crimp only. both the crimping tool and the size of the wire to be used.

A 14 SWG electrical cable when compared to a 18 SWG cable can carry. less current. the same current. more current.

Co-axial cables are used. as they are able to handle high current. as the fields due to current flow in the inner and outer cancel each other out. as they are protected from electromagnetic interference.

Direct removal connector pins are fitted from the rear. are fitted from the front but removed from the rear. and removed from the rear. and removed from the front.

When installing coaxial cable, it should be secured along its entire length. at 2-foot intervals. at 1-foot intervals. wherever the cable sags.

Which of the following factors must be taken into account when determining the wire size to use for an aircraft installation?. Allowable power loss, permissible voltage drop, current carrying capability of the conductor, type of load (continuous or intermittent). Mechanical strength, allowable power loss, resistance of current return path through the aircraft structure, permissible voltage drop. Allowable power loss, resistance of current return path through the aircraft structure, current carrying capability of the conductor, type of load (continuous or intermittent).

How should splices be arranged if several are to be located in an electrical wire bundle?. Enclosed in a conduit. Grouped together to facilitate inspection. Staggered along the length of the cable.

When approved, splices may be used to repair manufactured harnesses of installed wiring. The maximum number of splices permitted between any two connectors is. two. one. three.

The most common method of attaching a pin or socket to an individual wire in an MS electrical connector is by. crimping. soldering. crimping and soldering.

The pin section of an AN/MS connector is normally installed on. the power supply side of the circuit. either side of a circuit (makes no difference). the ground side of the circuit.

The primary considerations when selecting electric cable size are. the voltage and amperage of the load it must carry. the system voltage and cable length. current-carrying capacity and allowable voltage drop.

How does the routing of coaxial cables differ from the routing of electrical wires?. Coaxial cables are routed at right angles to stringers and ribs. Coaxial cables are routed as directly as possible. Coaxial cables are routed parallel with stringers and ribs.

The socket section of an AN/MS connector is normally installed on. the power supply side of the circuit. the ground side of the circuit. either side of a circuit (makes no difference).

In the American Wire Gauge (AWG) system of numbers used to designate electrical wire sizes, the number assigned to a size is related to its. cross sectional area. combined resistance and current-carrying capacity. current-carrying capacity.

Where electrical cables pass through holes in bulkheads, formers, ribs, firewalls etc., the wires should be protected from chafing by. wrapping with electrical tape. wrapping with plastic. using a suitable grommet.

When carbon is fully dissolved in iron and therefore uniformly distributed in solid solution, the metallurgical structure is called. Ferrite. Austenite. Pearlite.

When carbon is full dissolved iron and therefore uniformly distributed in solid solution, the metallurgical structure is called. Martensite. Austenite. Pearlite.

When one carbon atom chemically combines with 3 iron atoms, the result is called. Martensite. Pearlite. Cementite or Iron Carbide.

Cementite laminated with ferrite in alternate layers produces. Ferrite/Iron. Pearlite. Martensite.

Pearlite combines the properties of. martensite and iron carbide. cementite and Martensite. ferrite and cementite.

The amount of carbon necessary to produce a totally pearlitic structure is. 1.0%. 0.83%. 1.83%.

The properties of ferritic metal are that it is both. strong without being brittle. strong but too hard and brittle. soft and weak.

The properties of cementite metal are that it is both. soft and weak. strong but too hard and brittle. strong without being brittle.

The properties of pearlitic metal are that it is both. soft and weak. strong without being brittle. strong but too and hard and brittle.

When heating a straight carbon steel, there is a hesitation (slight pause) in the temperature rise before it increases a further 200oC. This hesitation is known as the. Lower Critical Point. Upper Critical Point. Eutectic Point.

Referring to a iron/carbon phase diagram, when talking about U.C.P and L.C.P, the point where the two meet is known as the. eutectic point. hesitation point. point of no return.