1
Q
- In a gas turbine, where does the cobtinuous combustion of atomized fuel oil takes place, in the same way as in an oil burner of a steam boiler?
A. Turbine
B. Combustion chamber
C. Fuel intake pipe
D. Burner
A
B. Combustion chamber
2
Q
- Which statement is true regarding 4-stroke cycle engine?
A. There is one power stroke in a cylinder for every 1 revolution of the crankshaft.
B. There are 2 revolutions of the camshaft for every cycle.
C. There are 2 revolutions of the crankshaft for every cycle.
D. The exhaust valve in the cylinder opens every 2 revolutions of the camshaft.
A
C. There are 2 revolutions of the crankshaft for every cycle.
3
Q
- What is the designated gas turbine type for use on ship’ propulsion?
A. Tubofan
B. Turbojet
C. Turboprop
D. Turboshaft
A
D. Turboshaft
4
Q
- A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPM. What is the speed reduction ratio?
A. 33.0 to 1
B. 3.33 to 1
C. 0.30 to 1
D. 3.0 to 1
A
D. 3.0 to 1
5
Q
- In a boiler where the drum water level is automatically controlled, which of the following conditions listed below could cause erratic variations in the water level?
A. High total dissolved solid content and foaming in the drum
B. Inability to maintain or correct high feedwater temparature
C. Low pH boiler water value
D. Uncontrolled fluctuating deaerator water level
A
A. High total dissolved solid content and foaming in the drum
6
Q
- What type of thermodynamic gas turbine built up of a gas generator to power the compressor and a gas power turbine connected to the ship’s propulsion?
A. Split-version gas turbine
B. Compressor-powered gas turbine
C. Single-shaft gas turbine
D. Combine-shaft gas turbine
A
A. Split-version gas turbine
7
Q
- A portion of the cargo of an LNG carrier boils off during each voyage. How is the cargo boil off normally handled?
A. Vented to the atmosphere
B. Mixed with nitrogen and circulated through the primary barrier
C. Compressed, condensed and returned to the cargo tanks
D. Burned in the boilers
A
D. Burned in the boilers
8
Q
- From the statement given below, choose the one which is accurate in relation to the operation of water-tube boiler and fire-tube boiler.
A. A fire-tube boiler has a much better capability to work at a higher steam
pressure.
B. A water-tube boiler can tolerate a short period of time without any water when the boiler is operating.
C. A fire-tube boiler does not require a non-return valve in the feed water line.
D. Water-tube boilers are more effecient and generally contain less water than fire-tube boiler. They are prone to major damage when run dry during operation.
A
D. Water-tube boilers are more effecient and generally contain less water than fire-tube boiler. They are prone to major damage when run dry during operation.
9
Q
- A diesel engine is operating under normal load with low firing pressures and high exhaust temperatures. What is the most probable cause of this condition?
A. The fuel rack being too far in.
B. The fuel rack being too far out.
C. A restricted exhaust manifold.
D. A missing air intake filter.
A
C. A restricted exhaust manifold.
10
Q
- To improve the efficiency of a gas turbine installation, what component is mounted in its exhaust system that enables part of its heats content to be used before it is blown out into the atmosphere?
A. Exhaust draft fan.
B. Exhaust distributor.
C. Nozzle
D. Heat exchanger.
A
D. Heat exchanger.
11
Q
- The high rotational speed of the gas turbine is not the best speed of ship’s propeller, which is most efficient at around 100 RPM. What is the remedy for this?
A. Coupling of a reduction gear box.
B. Installing a clutch mechanism.
C. Installing another lower output gas turbine geared to the shaft.
D. Installing a speed gorvernor at the power turbine.
A
A. Coupling of a reduction gear box.
12
Q
- The linear motion of a diesel engine piston is converted into the rotary motion, required to drive gears, propeller shaft and generators by the_______?
A. Crankshaft
B. Camshaft
C. Explosive range
D. Journal bearings
A
A. Crankshaft
