更多"Which of the following statements r"的相关试题:
[单项选择]Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）
A. Control the amount of lube oil burned in the combustion chamber
B. Transmit heat from the piston to the cylinder liner
C. Prevent damage to ring groove inserts by acting as a heat dam
D. Dissipate combustion chamber gas pressure by channeling it through the ring gap
[单项选择]Which of the following statements represents the reason for rolling over a diesel engine with the cylinder indicator cocks open prior?（）
A. To test the starting system
B. To remove air bubbles from the jacket water
C. To ensure that the lube oil system delivers pressure
D. To ensure foreign material (water etc) is not present in the cylinders
[单项选择]Which of the following statements represents an advantage of an electromagnetic clutch?（）
A. Large misalignments can be tolerated between the shaft and engine coupling
B. Slip is held to a minimum when reversing shaft rotation
C. Engine torsion vibrations to the driven shaft are eliminated
D. It aids in maintaining power factor
[单项选择]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
[单项选择]Which of the following statements represents the main difference between a relay and a contactor?（）
A. Contactors control current and relays control voltage
B. A relay is series connected and a contactor is parallel connected
C. Contactors can handle heavier loads than relays
D. Contactors are made from silver and relays are made from copper
[单项选择]Which of the following statements represents the correct action to take when three crew members discover a fire?（）
A. One man report the fire, and the other two men fight the fire
B. One man report the fire, one man fight the fire, and one man evacuate and secure the area
C. One man report the fire, one man fight the fire, and one man act as a safety observer
D. All three men fight the fire and report it immediately after it is extinguished
[单项选择]Which of the following represents the significance the fuel oil cetane number?（）
A. The cetane number has no affect on injection lag
B. The cetane number is an indication of the fuel’s viscosity
C. Ignition lag is reduced with fuels having a high cetane number
D. The cetane number is of little significance in the combustion
[单项选择]Which of the following statements about transmitting distress messages by radiotelephone is INCORRECT?（）
A. If no answer is received on the designated distress frequencies，repeat the distress call on any frequency available
B. Channel 16 (156.8) may be used for distress messages
C. It is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duration
D. Distress messages should first be transmitted on 2182 kHz
[单项选择]Which of the following statements concerning cargo is correct?（）
A. Cargoes are any type of goods transported by any type of ships
B. Cargoes are goods transported in bulk
C. Cargoes usually include goods transported in bulk and in containers
D. Cargoes are usually packaged in containers
[单项选择]Which of the following statements concerning frontal movements is TRUE（）.
A. The temperature rises after a cold front passes
B. The barometric pressure rises when a warm front passes
C. A cold front generally passes faster than a warm front
D. A warm front usually has more violent weather associated with it than a cold front
[单项选择]Which of the following statements concerning butterfly valves is correct?（）
A. Special tools are required for lapping or grinding
B. It is impossible to throttle flow with a butterfly valve
C. To close the valve, it is only necessary to turn the handle a quarter of a turn
D. The butterfly valve should never be used in a freshwater system
[单项选择]Which of the following statements concerning cylinder liner wear is true?（）
A. Liner wear is distributed equally between the upper and lower portions of the cylinder
B. Excessive liner wear causes wear between piston ring and groove
C. Excessive, but uniform liner wear will not cause wear between piston ring and groove
D. Liner wear is normally greatest in the middle of the cylinder
[单项选择]Which of the following statements concerning fuel atomization in a diesel engine cylinder is correct?（）
A. The greater the atomization, the greater the penetration
B. The greater the atomization, the less the penetration
C. The degree of atomization has nothing to do with the degree of penetration
D. Atomization and penetration are one and the same
[单项选择]Which of the following statements concerning energy is correct?（）
A. Energy can be created or destroyed
B. Energy may not be transformed
C. The total quantity of energy in the universe is always the same
D. None of the above
[单项选择]Which of the following represents the maximum percent of oxygen by volume required to be achieved by a ship’s inert gas system, prior to the commencement of crude oil tank washing?（）
A. 6%
B. 8%
C. 10%
D. 12%
[单项选择]Which of the following represents the emergency signal for fire aboard ship?（）
A. More than six short blasts and one long blast on the whistle
B. Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm
C. Three short blasts of the whistle supplemented by the same signal on the general alarm
D. More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm
[单项选择]Which of the following statements is TRUE regarding crane operations（）.
A. Radio communications allow the crane operator to disregard the use of hand signals
B. The crane operators and signalman must be familiar with the correct hand signals
C. The forward cranes can be operated from the bridge
D. The aft cranes can be operated from the aft steering station
