[单项选择]The（） is fitted in pair one is the main valve, the other the auxiliary or standby.
A. main stem stop valve
B. auxiliary steam stop valve
C. feed check or control valve
D. blow down valve

[单项选择]The（）is fitted in the main steam supply line and is usually of the non-return type.
A. main steam stop valve
B. auxiliary steam stop valve
C. feed check or control valve
D. blow down valve

[单项选择]When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.
A. just
B. nearly
C. merely
D. already

[单项选择]Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）
A. Over speed
B. fire improperly
C. lose oil pressure
D. overheatrapidly

[单项选择]The external circumference of a pair of main bearing shells is slightly （） that of the bore of the housing which receives them Whats the meaning of “that” in the sentence above？
A. less than
B. lighter than
C. larger than
D. smaller than

[单项选择]If a single cylinder relief valve on a main propulsion diesel engine begins to lift, but it is not possible to secure the engine, which of the following actions should be taken?（）
A. Increase the cooling water flow to the engine
B. Secure or reduce fuel to that cylinder
C. Screw down on the pressure adjusting spring to decrease to decrease popping pressure
D. Readjust the injection timing

[单项选择]The（） is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.
A. main stem stop valve
B. auxiliary steam stop valve
C. feed check or control valve
D. blow down valve

[单项选择]A built-up exhaust valve is one in which （）.
A. the stem and heads are made of different material
B. low-alloy steel is used throughout
C. a replaceable valve disk is welded to the head
D. the self-centering action comes from motion of the valve stem in the guide

[单项选择]A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.
A. damage from crane operations
B. being used for wash down purposes
C. accidental diversion of flow to wrong location
D. freezing

[单项选择]Each cylinder has one starting valve which is usually opened by air pressure and closed by （）
A. nuts and bolts
B. new joints
C. spring force
D. sealing rings

[单项选择]One function of the thermal expansion valve is to（）
A. act as a pilot from the solenoid valve
B. regulate the amount of refrigerant flow to the coil
C. regulate the water flow
D. turn the compressor off and on

[单项选择]He said that he had turned the main engine one complete revolution with the （）.
A. turning gear
B. steering gear
C. spur gear
D. chain gear

[单项选择]Your company has a main office and one branch office. The main office has a print server named Printer1.The branch office has a print server named Printer2. Printer1 manages 15 printers and Printer2 manages seven printers.You add Printer2 to the Print Management console on Printer1.You need to send an automatic notification when a printer is not available. What should you do？（）
A. Configure an e-mail notification for the Printers With Jobs printer filter.
B. Configure an e-mail notification for the Printers Not Ready printer filter.
C. Enable the Show informational notifications for local printers option on both print servers.
D. Enable the Show informational notifications for network printers option on both print servers.

[单项选择]One of the main differences between the various types of screw pumps is in the （）.
A. stuffing box diameter
B. direction of rotation of the screws
C. pitch of the screws
D. type of driving gears

[单项选择]One of the main purposes of refractories in a boiler furnace is to（）
A. help preheat the air for the furnaces
B. help preheat the feedwater
C. protect economizer from excessive heat
D. prevent excessive furnace heat losses

[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time

[单项选择]One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.
A. maintain radial alignment between the pump impeller and casing
B. absorb all impeller shaft end thrust
C. prevent water leakage to the atmosphere
D. prevent wear of the pump casing and/or impeller

[单项选择]Fuel oil is thought to be one of the main factors （） the operation and maintenance of an engine.
A. have nothing to do with
B. having nothing to do with
C. have much to do with
D. having much to do with