4th Class Boiler Test 2
- 1.In a recovery boiler:
- A.
Waste heat is recovered from the baking operation
- B.
Black liquor is burned to eliminate lignin
- C.
Smelt is burnt to produce black liquor
- D.
Lime is recovered for re-use
- 2.The economizer in the steam cycle of an electricity generating plant is located between the:
- A.
Radiant and convection superheaters
- B.
Boiler drum and superheater
- C.
Feedwater pump and the boiler drum
- D.
Superheater and the turbine.
- 3.The purpose of the absorber in a natural gas plant is to:
- A.
Remove condensates from the gas
- B.
Absorb all the hydro-carbons from the gas
- C.
Scrub the gas from amine
- D.
Remove hydrogen sulphide and carbon dioxide from the gas
- 4.During an internal boiler inspection an engineer should check:
- A.
That there is a proper air flow through the furnace.
- B.
That all external parts of drums and equipment are positioned properly.
- C.
For scale deposits, corrosion, erosion, cracks, leaks or other defects.
- D.
That the moveable grates and ash system are functioning properly.
- 5.Raising or lowering of heavy objects using ropes and cables is known as:
- A.
Lifting
- B.
Rigging
- C.
Hoisting
- D.
Elevating
- 6.Natural ropes are made of:
- A.
Nylon
- B.
Polyethylene
- C.
Dacron
- D.
Manila
- 7.Prior to commencing boiler cleaning operations it is necessary to: 1. test the boiler water 2. close steam and water valves 3. tag all valves to indicate shut down 4. complete the boiler-room log book 5. check out the burners.
- A.
1 and 3
- B.
2 and 3
- C.
3 and 5
- D.
1 and 5
- 8.The boiler boiling out procedure:
- A.
Should be done at operating pressure
- B.
Should be done before the dry out procedure
- C.
Should be done at one-half the operating pressure
- D.
Should be done once a year
- 9.The purpose of boiling out a boiler is:
- A.
To test the material of the boiler
- B.
To find the boiling point of the water in the boiler
- C.
To remove any grease and oil from the heating surface
- D.
To check if there are any leaks
- 10.The best type of filter for the removal of fine dust, smoke and fumes is the:
- A.
Viscous impingement filter
- B.
Dry filter
- C.
Bag type filter
- D.
Electrostatic filter
- 11.A Runaround air conditioning heat recovery system consists of two finned tube heat exchangers, the preconditioning coil and the recovery coil. Where is the preconditioning coil of this system usually located?
- A.
On the suction side of the pump
- B.
On the discharge side of the 3-way mixing valve
- C.
In the duct work handling the ventilation into the process
- D.
At the end of the charging unit
- 12.Three common sensing elements used on humidistat are the: 1. Human hair element 3. Wood element 2. hygroscopic element 4. Metal element.
- A.
1, 2 and 3
- B.
1, 2 and 4
- C.
1, 3 and 4
- D.
2, 3 and 4
- 13.The three types of compressors most frequently used in refrigeration systems are:
- A.
1, 2 and 3
- B.
1, 3 and 4
- C.
2, 3 and 4
- D.
1, 2 and 4
- 14.The expansion valve in a refrigeration system is:
- A.
Between the condenser and the receiver
- B.
Between the evaporator and the compressor
- C.
Between the receiver and the evaporator
- D.
Between the compressor and the condenser
- 15.Safety valves on a refrigeration system:
- A.
Should be fitted on the receiver
- B.
Should be tested by hand lever regularly
- C.
Should be equipped with a leather seat
- D.
Should discharge to sewer
- 16.In the vapour compression type of refrigeration system, the liquid refrigerant is changed to a gas in the:
- A.
Condenser
- B.
Evaporator
- C.
Receiver
- D.
Compressor
- 17.In some installations in order to guarantee a supply of clear hot water and prolong the life of a hot water heater the:
- A.
Temperature differential of the temperature control is increased,
- B.
Temperature differential of the temperature control is decreased,
- C.
Operating temperature is raised,
- D.
Inner shell of the heater is lined with cement,
- 18.One advantage of the electric probe type of low water fuel cut-off is:
- A.
It contains no moving parts or the possibility of mechanical failure is eliminated,
- B.
They operate at a higher water level than the float type,
- C.
That the probes give an indication of the dissolved solids in the boiler water,
- D.
It gives a quicker response to the feedwater regulator,
- 19.Two element feedwater control:
- A.
Measures water level and steam flow
- B.
Measures water flow and steam flow
- C.
Measures water level and steam level
- D.
Measures oil flow and steam flow
- 20.Steam is prevented from leaking out around the valve stem of a packless radiator valve with the use of:
- A.
A seat
- B.
A diaphragm
- C.
A spring
- D.
An outside screw
- 21.The purpose of fins on a convector tube is to:
- A.
Strengthen the tube
- B.
Prevent rupture
- C.
Increase heat transfer
- D.
Accumulate warm air
- 22.The purpose of a cushion tank is to:
- A.
Store heat while the boiler is firing
- B.
Allow for the expansion of water in the system
- C.
Prevent the system from overflowing
- D.
To prevent the water in the system from freezing
- 23.The blow down valve of a steam heating boiler must:
- A.
Be installed in series with the safety valve,
- B.
Be installed in the steam space,
- C.
Regulate the feedwater,
- D.
Be installed at the lowest point of the boiler,
- 24.Your boiler is operated with automatic water feeders. If the boiler suddenly requires an increase in water treatment, what should you look for?
- A.
See if the chemical pump has stopped
- B.
Check for a loss of water
- C.
Check to see if the chemical supplier has sent the wrong chemicals
- D.
Nothing. Simply increase the pump stroke to put more chemicals into the
- 25.A hot water boiler is protected from over pressure by means of:
- A.
A safety pop valve
- B.
A safety relief valve
- C.
An expansion valve
- D.
An air release valve
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