Motor 07

Generating tubes in waste heat boilers are finned to __________.

• reduce gas flow turbulence

• prevent exhaust gas corrosion

• increase the rate of combustion

• increase the rate of heat transfer

Which of the following is necessary for all waste heat boiler installations, regardless of design or manufacturer?

• A means to control of evaporation

• An independent means to prevent feedwater contamination

• Installation of a powered circulating booster pump

• Installation of a superheater

When accumulated carbon at the air inlet ports of a two-stroke/cycle diesel engine is being removed, you should take care to avoid carbon __________.

• entering the cylinder

• particles becoming lodged under the intake valves

• entering the water jacket

• particles entering lube oil

A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water __________.

• around the engine

• around the cooler

• to the expansion tank

• overboard

Failure of the feed pump to deliver feedwater to an auxiliary boiler could be caused by __________.

• a low pump suction lift

• abnormally low water temperature

• grounded probes in the water level control

• a high pump suction head

Which letter represents the exhaust gas exit point for the diesel engine shown in the illustration?

• "K"

• "J"

• "N"

• "V"

In which of the following areas of a crosshead engine is a permanently connected fire extinguishing system required?

• Exhaust manifolds in excess of eight inches in diameter.

• Crankcases having a gross volume in excess of 21 cubic feet.

• Turbocharger inlet piping in excess of twelve inches in diameter.

• Scavenging spaces in open connection to the cylinders.

The diesel engine component labeled "Z", shown in the illustration is called the __________.

• inlet valve bridge

• EGT monitor

• exhaust valve bridge

• scavenging air inlet

The diesel engine component labeled "1", shown in the illustration is called a/an __________.

• inlet valve spring

• external thread

• conical speed/surge prevention device

• exhaust valve spring

The port-and-helix metering pumps, used in diesel fuel injection systems, are usually designed to produce a constant beginning and a variable ending of fuel injection. These pumps are usually __________.

• timed for port opening

• timed for port closing

• controlled by cam stroke

• controlled by plunger stroke