Comp 5 Flashcards
1
Q
- How much capacity of starting air should be available for a direct-reversible engine as compared to a uni-directional engine?
A. Greater or lesser capacity of starting air does not matter
B. The same capacity of starting air.
C. Greater capacity of starting air.
D. Lesser capacity of starting air.
A
C. Greater capacity of starting air.
2
Q
- To improve th efficiency of gas turbine plant, what component is mounted in the exhaust system that uses part ot its heat content to be used before it is blown out into the funnel?
A. Nozzle
B. Heat exchager
C. Exhaust draft fan
D. Exhaust diffusor
A
B. Heat exchager
3
Q
- Circulation in a water-tube boiler is caused by the difference in the:
A. Angle of inclination of the tubes
B. Heights of the boiler drum
C. Densities of the circulating water
D. Area and length of the water-tubes
A
C. Densities of the circulating water
4
Q
- What component in a boiler assist in achieving higher thermal efficiency wherein feed water being pumped into the boiler is heated by utelizing fuel gases,hence, less energy is required to raise steam?
A. Superheater
B. Feed water heater
C. Attemperator
D. Economizer
A
D. Economizer
5
Q
- What phenomenon produces variations in the level of the liquid surface in the steam drum whenever boiler load or changes in steam demand occurs?
A. Pressure Rise and Drop phenomenon
B. Level Rise and Fall phenomenon
C. Shrink and Swell phenomenon
D. Combustion On-Off phenomenon
A
C. Shrink and Swell phenomenon
6
Q
- Perfaining to saltwater lubricated stern tube stuffing boxes, which of the following is usually observed when the ship is expected to be port for an extended period?
A. The packing is adjusted for greater cooling or replaced.
B. The drain connection is left opened.
C. The stuffing box is continually flushed.
D. The stuffing box gland is tightened.
A
D. The stuffing box gland is tightened.
7
Q
- What causes carbon deposits on the boiler burner throat ring?
A. A faulty ignition electrode
B. The burner On-Off short-cycling
C. A dirty atomizer sprayer plate
D. Too much excess combustion air
A
C. A dirty atomizer sprayer plate
8
Q
- The term “2-element control” applied to boilers refer to the number of process variables (PVs) that are measured to effect control of the boiler feedwater control valve. One of these measured PVs is the liquid level in the boiler drum. What is the 2nd PV element applied?
A. Feed water flow rate
B. Fuel/air ratio
C. Main steam outlet flow rate
D. Steam pressure in the boiler drum
A
A. Feed water flow rate
9
Q
- What is the effective means of measuring the total dissolved solids in boiler water?
A. Not possible to test solids in boiler water
B. pH test
C. Alkalinity test
D. Conductivity test
A
D. Conductivity test
10
Q
- What component in a boiler assist in achieving higher thermal efficiency wherein air being ducted to the boiler furnace is heated by fuel gases which result to a higer furnace temperature and potential for raising steam?
A. Air heater
B. Forced draft fan
C. Attemperator
D. Air damper
A
A. Air heater
11
Q
- The marine gas turbine has three major parts. Two of which ate the gas turbine and air compressor. What is the other one?
A. Evaporator
B. Combustion chamber
C. Air ejector
D. Condenser
A
B. Combustion chamber
12
Q
- Why should boiler sootblowers normally only operated in the correct sequence?
A. To ensure soot is cleared progressively from the bottom tubes to the top and toward the boiler uptakes
B. To minimize loss of steam pressure
C. So that the operator does not forget which soot blowers have been used
D. To avoid excess stress in the boiler
A
A. To ensure soot is cleared progressively from the bottom tubes to the top and toward the boiler uptakes
13
Q
- What is termed as the complete oxidation of fuel, with the exact theoritical amount of oxygen required?
A. Complete combustion
B. Perfect fuel gas
C. Perfect combustion
D. Oxidation state
A
C. Perfect combustion
14
Q
- What is steam, whose temperature is equal to the boiling point corresponding to the pressure?
A. Superheated steam
B. De-superheated steam
C. Saturated steam
D. Dry steam
A
C. Saturated steam
15
Q
- How is an impulse velocity-compunded turbine applied in reducing the very high speed of rotation?
A. The increased rows of fixed blades serve to redirect the steam to the next moving blades where the velocity of steam is reduced.
B. All pressure drop occurs in the nozzles where the pressure in the turbine remains high.
C. since the rows of blades are connected to the same shaft, there will be loss of output as speed of rotation.
D. There are added number of nozzles and only part of the pressure drop occurs in each stage, hence steam velocities will not ne so high.
A
A. The increased rows of fixed blades serve to redirect the steam to the next moving blades where the velocity of steam is reduced.
