______ is an opening for supplyi

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It is well known that good lubrication will _____ the bearings from becoming overheated.
- A.present
- B.prevent
- C.avoid
- D.provide
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Capacitance is the property of an electric circuit opposing a change in the _____.
- A.current in the circuit
- B.voltage in the circuit
- C.inductance in the circuit
- D.resistance in the circuit
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For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an _____.
- A.oil spray
- B.oil bath
- C.oil control rings
- D.drilled passage through the camshaft
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On the top of the cylinder is mounted the cylinder cover which is pressed onto _____ of the cylinder liner by means of nuts and studs.
- A.the camshaft
- B.the flange
- C.the ridge
- D.the bulge
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The water level showing in a boiler water gauge glass is usually _____ during working.
- A.higher than the actual drum water level
- B.equal to the actual drum water level
- C.increasing due to steam condensation in the glass
- D.lower than actual drum water level
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A solenoid valve used in a refrigeration system should be installed .
- A.with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valve
- B.upright, sensing temperature of the box, and upstream of the thermal expansion valve
- C.upright, sensing temperature of the box, and downstream of the thermal expansion valve
- D.upright, sensing heat of the tail coil, and upstream of the thermal expansion valve
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Which of the following statements represents the advantage of rotary pumps as compared to reciprocating pumps?
- A.The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump
- B.Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight
- C.Rotary pumps occupy only one-half the space of reciprocating pumps
- D.Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump
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Charging-air pressure increases if there is incorrect combustion and drop in the _____ of the diesel engine.
- A.machine efficiency
- B.machinery efficiency
- C.mechanical efficiency
- D.mechanics efficiency
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_____ is fully floating in both connecting rod small end and the piston skirt.
- A.The piston rod
- B.The cross head pin
- C.The gudgeon pin
- D.The crank-pin
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Which one is not the component of a typical, marine pattern self-contained unit?
- A.a centrifugal fan
- B.a direct expansion cooler
- C.a hermetic compressor
- D.a centrifugal pump
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______ is an opening for supplying seawater to condensers, pumps, etclocated in the hull below the waterline and having means for the attachment of associated piping.