MOTOR 18 Y 17

Air receivers installed in starting air systems are to be __________.

• cylindrical in shape with service connections located at the top and bottom

• opened and made available for inspection during biannual inspections

• provided with automatic drain traps for the removal of moisture

• so installed as to make the drain connections effective under extreme conditions of trim

To successfully reduce an excessively high diesel engine exhaust gas temperature, you should __________.

• reduce the engine driven fuel pump outlet pressure

• retard the fuel injector timing to reduce power

• increase the fuel rack setting

• reduce the load on the engine

High exhaust back pressure will result in an increase in __________.

• turbocharger efficiency

• engine power output

• carbon deposits on fuel injectors

• cylinder scavenging

The governor for an emergency diesel generator is shown in  the illustration. When a large change in load results in a change in engine speed, which of the parts listed will be the FIRST governor component to react to the change in load?

• Piece #8

• Piece #9

• Piece #13

• Piece #21

A loop or cross scavenged engine utilizes the motion of its pistons and a turbocharger to provide scavenging air. Which of the listed mechanical designs prevents the air under the pistons from being pumped back through the scavenge ports during the piston power stroke?

• Masked intake ports

• Length of the piston skirt

• Positive pressure from the blower

• Lower liner seals

Which of the following statements concerning a closed type fuel injection nozzle is true?

• The hole type of a closed nozzle is self-cleaning.

• Multi-hole type nozzles are only suitable for use in engines with pre-combustion chambers.

• Most closed nozzles open by fuel oil pressure acting on the differential area of the needle valve.

• The pintle type nozzles are most susceptible to carbon deposits building up in and around the orifice.

The fuel injection pumps on a diesel engine are controlled  by a linkage system attached to the __________.

• camshaft

• crankshaft

• governor

• flywheel

What type of fitting is to be used on diesel engine fuel injection line piping?

• Mild steel

• Hardened steel

• Extra heavy

• Double extra heavy

Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits, may cause __________.

• low compression pressure

• increased piston wear

• increased cylinder lube oil consumption

• poor contact between compression rings and liner

If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is __________.

• a broken shaft on the freshwater pump

• excessive fouling of the heat exchanger

• an incorrect thermostatic element operating range

• lube oil in the cooling water