5th Class Power Engineering Questions And Answers All correct

5th Class Power Engineering Questions And Answers All correct


._____________ are installed in branch ducts near their takeoff point on the plenum and are used to
adjust the warm airflow to the various areas so that equal comfort conditions can be obtained
throughout the building. - ANSWER-Dampers



.A _________ valve, also called an automatic fill valve, is needed to keep a hot water heating system
with a closed expansion tank automatically filled and under proper pressure. - ANSWER-Pressure
reducing



.A 2-pole or double pole switch has ______ terminals for connection to the wires. - ANSWER-Four



.A boiler in which steam is made at a present not greater than 103 kilopascals, is properly termed a: -
ANSWER-Heating plant



.A boiler item which should be checked monthly is: - ANSWER-The flame detection system



.A centrifugal pump that has high suction lift and a resulting negative casing pressure will likely have: -
ANSWER-A lantern ring or seal cage in the stuffing box



.A Class ___ lever has the fulcrum between the effort and the load. - ANSWER-one



.A class "B" type of fire involves combustion in: - ANSWER-Flammable or combustible liquids



.A class "C" type of fire involves combustion in: - ANSWER-Live electrical equipment



.A common type of water heater that incorporates an automatic gas-fired storage heater and features a
single tank used for both heating and storing the water is the: - ANSWER-Direct hot water heater



.A complete check of the boiler heating system should be carried out: - ANSWER-At the end of the
heating season

,.A Confined Space is defined as: - ANSWER-Any enclosed or partially enclosed space having restricted
access and egress and which due to its nature may form a trap or become a life threatening
environment



.A decimal fraction is a fraction which has 10 or a power of 10 as a: - ANSWER-Denominator



.A disadvantage of condensing boilers is that: - ANSWER-The boilers are more expensive than customary
boilers



.A disadvantage of the metal sheath electric infrared heating element is its: - ANSWER-Wind resistance



.A disadvantage of the quartz bulb electric infrared heating element is its: - ANSWER-Impact resistance



.A facilities fire pump is required in order to: - ANSWER-Meet the requirements of the fire protection
system



.A fin coil consists of one or more rows of parallel tubes fitted with fins to _____________exchange. -
ANSWER-Increase the rate of heat



.A fire detector is sensing device usually mounted against the ceiling which responds when: - ANSWER-
The temperature in the area reaches a set level



.A force can be defined as: - ANSWER-A push or pull exerted on an object



.A forced warm-air furnace consists of all but which of the components listed?

a. Dehumidifier

b. Combustion equipment

c. Blower or fan

d. Heat exchanger

e. Filter - ANSWER-a. dehumidifier

,.A heat exchanger is used in a compression refrigerating system to transfer heat to the: - ANSWER-Hot
vapour being drawn from the evaporator



.A heating boiler must have a permanently attached marker indicating: - ANSWER-Lowest permissible
water level



.A hot water heating system also known as a ________ heating system is similar in many respects to a
steam heating system. - ANSWER-Hydronic



.A larger residence, located in an area with colder winters would require a more complex system to
maintain satisfactory conditions on a year-round basis including all except:

a. Humidification

b. Filtration

c. Cooling

d. Ventilation

e. Heating - ANSWER-c. Cooling



.A larger residence, located in an area with hot summers would require a more complex system to
maintain satisfactory conditions on a year-round basis including all except:

a. Heating

b. Ventilation

c. Filtration

d. Dehumidification

e. Cooling - ANSWER-a. Heating



.A leaking steam trap will allow steam to blow from the radiator into the: - ANSWER-Return lines



.A low percentage (15%) of the energy delivered by the electricity is absorbed as heat in the boiler.

true or false - ANSWER-False

, .A luminaire is the: - ANSWER-Complete lighting unit



.A machined and slightly tapered piece of pipe found in cast-iron sectional heating boilers is referred to
as a: - ANSWER-Push nipple



.A major source of injury to the public is: - ANSWER-Slippery floor conditions



.A modular cast-iron heating boiler - ANSWER-Consists of a number of horizontal sectional cast-iron
boilers



.A more suitable design of thrust bearing has the bearing surfaces in the form of pads, in which -
ANSWER-The pads are free to tilt



.A percentage can be changed to a fraction by: - ANSWER-dividing by 100



.A pipe siphon is used on a boiler to: - ANSWER-Maintain a water seal between the steam and the
Bourdon tube



.A poor quality lubricant can cause premature bearing failure due to: - ANSWER-Hard pieces of lubricant
being pressed into the bearing surfaces producing flaking and pitting



.A positive displacement compressor draws in a charge of free air: - ANSWER-Traps it, reduces its
volume and then discharges it



.A pressure gauge can most accurately be calibrated by using: - ANSWER-A dead weight tester



.A pressure-actuated refrigeration control cannot be used in conjunction with a/an _________
expansion valve - ANSWER-Automatic



.A programming control on a natural draft gas fired boiler operates in the following sequence. -
ANSWER-The operating control initiates a startup