Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, ______ to a maximum as the piston approaches top or bottom dead center and then ______ back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.
- A.accelerates / decelerates
- B.accelerates / accelerates
- C.decelerates / decelerates
- D.decelerates / accelerates
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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