Which of the diesel engine compo

相关试题

The number of cycles per second occurring in AC voltage is known as the _____.
- A.phase angle
- B.frequency
- C.wave form.
- D.half mode
点击查看答案
When the ship, its main propulsion device equipped with clutch, arrived at the port and finished with the engine, the correct operation should be .
- A.disengaging the clutch firstly, then stopping the main engine
- B.stopping the main engine firstly, then disengaging the clutch
- C.stopping the cooling water pump firstly, then stopping the main engine
- D.stopping the main engine and disengaging the clutch at the same time
点击查看答案
In using reduction gears to obtain efficient propeller speeds, _____.
- A.they must be located at the after end of the engine
- B.they can only be used with one engine at a time
- C.they eliminate the need for controllable pitch propellers
- D.they are connected to the engine with a flexible coupling
点击查看答案
The feed water to the boiler will comprise _____.
- A.condensate
- B.a small amount of make-up feed
- C.A and B
- D.None of the above
点击查看答案
Why is it important for fuel oil tanks not to be topped off at the inner bottom level when loading on a cold day?
- A.Increased viscosity of the product needs higher loading pressure, which increases the chances of a spill
- B.Air pockets may cause the fuel to bubble out of the ullage hole
- C.The temperature rise of the fuel will cause an overflow
- D.Fueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened
点击查看答案
Which of the following terms would best describe the temperature at which a liquid boils at a given pressure? .
- A.Degree of saturation
- B.Saturation temperature
- C.Superheated temperature
- D.Degree of superheat
点击查看答案
Which one of the following is not generally recognized as one constitute of bilge water? .
- A.Oil leaking from tanks inside engine room
- B.Engine room cleaning water
- C.Water leaking from the separator sludge tank
- D.Sewage
点击查看答案
When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear, the _____.
- A.ram relief valves bypass oil to stop rudder movement
- B.six-way valve shifts to the neutral flow position
- C.steering pump electric motor is de - energized by the transfer switch
- D.follow-up gear takes the hydraulic pump off stroke
点击查看答案
If some surveys refer to statutory survey and ship classification survey but occur temporarily, we call them ____.
- A.periodic survey
- B.statutory survey
- C.additional survey
- D.annual survey
点击查看答案
If a centrifugal pump vibrates and is noisy when operating, the cause could be _____.
- A.worn gland sealing shaft
- B.worn wearing rings
- C.a bent shaft
- D.reversed pump coupling
点击查看答案

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?