Power Engineering - 4B11 UPDATED ACTUAL Questions and
CORRECT Answers
Question: ________ have largely replaced the cast-iron radiator in modern installations. a. unit heaters b.
open heaters c. convectors d. space heaters e. radiator traps
Correct Answer: c. convectors
Question: When air is forced through a heating coil, where the fan and coil are within the same unit, the
unit is known as
Correct Answer: a. a diverter b. a unit heater c. a convertor d. an injector e. an air vent: b. a unit heater
Question: The amount of air passing through the unit ventilator can be controlled by
Correct Answer: a. traps b. three-speed switches c. automatic valves d. air vents e. supply ducts: b.
three-speed switches
Question: In all systems, the horizontal steam supply pipes between boiler and heating units are called the
Correct Answer: a. Mains b. Banks c. Branches d. Risers e. Downcomers: a. Mains
Question: Modern radiators are usually made of
Correct Answer: a. Brass b. Cast iron c. Copper d. Steel e. Stainless steel: d. Steel
Question: In a _________ system, the mains are located above the heating units. a. wet b. upfeed c. return
feed d. dry e. downfeed
Correct Answer: e. downfeed
Question: Air can be removed from steam heating systems by
Correct Answer: a. an air separator b. a dip tube c. a steam trap d. air vents e. an air header: d. air vents
Question: Which of the following is not a piece of heating equipment? a. steam b. fin coil c. radiator d.
convector e. unit heater
Correct Answer: a. steam
Question: Which of the following would you NOT find in a steam heating system? a. Convectors b.
Cushion tanks c. Air vents d. Return traps e. Condensate tanks
Correct Answer: b. Cushion tanks
Question: In all steam heating systems the horizontal steam supply pipes between boiler and heating units
are called the
Correct Answer: a. return lines b. distributing lines c. risers d. mains e. branches: d. mains
Question: In a variable vacuum system, the rate of steam supply can be adjusted by
Correct Answer: a. check valve b. gate valve c. automatic modulating control valve d. ball valve e. steam
trap: c. automatic modulating control valve
Question: Finned convectors should be kept free of
Correct Answer: a. steam b. dust c. Air currents d. corrosion e. all of the answers: b. dust
Question: Push nipples are
,Correct Answer: a. devices used to connect radiator sections together b. greasing devices for furnace fans
c. used to connect pipes together in a heating system d. a connection used for pressure gauges e. air release
devices on radiators: a. devices used to connect radiator sections together
Question: An air vent is partially filled with volatile liquid so that
Correct Answer: a. When relatively cool air surrounds the cylinder, it causes the needle valve to close b.
Then operating mechanism will be protected from live steam c. When relatively cool air surrounds the
cylinder, it causes the needle valve to open d. The air will flow in one direction only e. When hot steam
surrounds cylinder, it causes the needle valve to open.: c. When relatively cool air surrounds the cylinder, it
causes the needle valve to open
Question: The cause of any cold section in a steam heating system may be
Correct Answer: a. a defective steam trap b. a defective air valve c. a broken valve spindle d. a closed
valve e. all of the answers: e. all of the answers
Question: Radiators can be classified as
Correct Answer: a. window, duct, or floor b. wall-hung legless, floor, and window c. legless, ductless, and
floor d. ceiling, floor, window, and legless e. floor, window, or ceiling: b. wall-hung legless, floor, and
window
Question: Push nipples
Correct Answer: a. Are used to connect pipes together in a heating system b. Connect radiator sections
together c. seal tighter than unions d. Are tapered in the middle e. Have decreasing cross-sectional areas
from one end to the other: b. Connect radiator sections together
Question: The main source of trouble in convectors are
Correct Answer: a. air traps b. connecting rods c. all of the answers d. valves and traps e. air vents: d.
valves and traps
Question: If the water level falls below the gauge glass during operation of a steam heating boiler, the
operator should
Correct Answer: a. tell supervisor b. add more water immediately c. blow down the boiler d. shut the
boiler down e. operate the safety valve: d. shut the boiler down
Question: Unit ventilators are
Correct Answer: a. Ceiling suspended unit heaters b. Floor radiators c. Baseboard type heaters d. Cabinet
type heaters e. Ceiling mounted unit heaters: d. Cabinet type heaters
Question: The device which allows condensate to drain from a steam heater but stops the steam from
escaping is called a
Correct Answer: a. radiator b. radiator trap c. air vent d. convector e. air separator: b. radiator trap
Question: Causes of insufficient steam supply to the heating units can be attributed to a. improper pitch b.
clogging of connections and valve c. all of the answers d. none of the answers e. defective radiator valve
Correct Answer: c. all of the answers
Question: Another name for a unit ventilator is a
Correct Answer: a. uninvent b. convector c. exhauster d. radiator e. register: a. uninvent
, Question: Who can balance a heat system
Correct Answer: a. knowledgeable person with proper tools b. chief engineer c. operator d. shift
supervisor e. non of the answers: a. knowledgeable person with proper tools
Question: When starting up a steam heating boiler it should be filled to
Correct Answer: a. of a gage glass b. of a gauge glass c. the lowest visible part of the gauge glass d. of a
gauge glass e. the maximum level: b. of a gauge glass
Question: In the case of radiators and convectors, the main sources of trouble are the
Correct Answer: a. valves and traps b. connecting rods c. push nipples d. air traps e. air vents: a. valves
and traps
Question: A radiator trap is a device that is used to
Correct Answer: a. allow only water to leave the radiator b. allow only steam to leave the radiator c.
depressurize a radiator d. vent steam from the radiator e. allow only air to leave the radiator: a. allow only
water to leave the radiator
Question: Hand operated pet cocks on heating systems used for expelling air have been superseded by
Correct Answer: a. check valves b. diverters c. steam traps d. automatic air vents e. pipe siphons: d.
automatic air vents
Question: Hand operated pet cocks for expelling air from heating systems have been superseded by
Correct Answer: a. Automatic air vents b. Check valves c. Pipe siphons d. Diverters e. Steam traps: a.
Automatic air vents
Question: In fin coil type heaters, individual room temperature is controlled by
Correct Answer: a. switches b. supply ducts c. automatic valves d. air relays e. dampers: e. dampers
Question: Unit heaters differ from convectors in that they use _______ to increase heat transfer. a. blowers
b. copper tubes c. natural circulation d. brass tubes e. metal fins
Correct Answer: a. blowers
Question: Excessive makeup water to the condensate return tank can be caused by
Correct Answer: a. automatic makeup valve sticking open b. the feedwater being too cold c. oversized
piping d. too low a firing rate e. manual makeup valve closed: a. automatic makeup valve sticking open
Question: Another name for the one pipe steam system heating system is
Correct Answer: a. pressure system b. divided-pipe system c. vacuum system d. air vent system e. vapor
system: d. air vent system
Question: Unit ventilators
Correct Answer: a. use a mixture of inside and outside air b. use natural draft c. use only outside air for
heating d. have no damper e. use only inside air for heating: a. use a mixture of inside and outside air
Question: In a gravity return system the boiler should be placed
Correct Answer: a. well below the lowest radiator b. in a central location c. on an elevated platform d. at
the same level as the radiators e. well above the highest radiator: a. well below the lowest radiator
Question: Slow or insufficient heat throughout a building heated by steam can be caused by
CORRECT Answers
Question: ________ have largely replaced the cast-iron radiator in modern installations. a. unit heaters b.
open heaters c. convectors d. space heaters e. radiator traps
Correct Answer: c. convectors
Question: When air is forced through a heating coil, where the fan and coil are within the same unit, the
unit is known as
Correct Answer: a. a diverter b. a unit heater c. a convertor d. an injector e. an air vent: b. a unit heater
Question: The amount of air passing through the unit ventilator can be controlled by
Correct Answer: a. traps b. three-speed switches c. automatic valves d. air vents e. supply ducts: b.
three-speed switches
Question: In all systems, the horizontal steam supply pipes between boiler and heating units are called the
Correct Answer: a. Mains b. Banks c. Branches d. Risers e. Downcomers: a. Mains
Question: Modern radiators are usually made of
Correct Answer: a. Brass b. Cast iron c. Copper d. Steel e. Stainless steel: d. Steel
Question: In a _________ system, the mains are located above the heating units. a. wet b. upfeed c. return
feed d. dry e. downfeed
Correct Answer: e. downfeed
Question: Air can be removed from steam heating systems by
Correct Answer: a. an air separator b. a dip tube c. a steam trap d. air vents e. an air header: d. air vents
Question: Which of the following is not a piece of heating equipment? a. steam b. fin coil c. radiator d.
convector e. unit heater
Correct Answer: a. steam
Question: Which of the following would you NOT find in a steam heating system? a. Convectors b.
Cushion tanks c. Air vents d. Return traps e. Condensate tanks
Correct Answer: b. Cushion tanks
Question: In all steam heating systems the horizontal steam supply pipes between boiler and heating units
are called the
Correct Answer: a. return lines b. distributing lines c. risers d. mains e. branches: d. mains
Question: In a variable vacuum system, the rate of steam supply can be adjusted by
Correct Answer: a. check valve b. gate valve c. automatic modulating control valve d. ball valve e. steam
trap: c. automatic modulating control valve
Question: Finned convectors should be kept free of
Correct Answer: a. steam b. dust c. Air currents d. corrosion e. all of the answers: b. dust
Question: Push nipples are
,Correct Answer: a. devices used to connect radiator sections together b. greasing devices for furnace fans
c. used to connect pipes together in a heating system d. a connection used for pressure gauges e. air release
devices on radiators: a. devices used to connect radiator sections together
Question: An air vent is partially filled with volatile liquid so that
Correct Answer: a. When relatively cool air surrounds the cylinder, it causes the needle valve to close b.
Then operating mechanism will be protected from live steam c. When relatively cool air surrounds the
cylinder, it causes the needle valve to open d. The air will flow in one direction only e. When hot steam
surrounds cylinder, it causes the needle valve to open.: c. When relatively cool air surrounds the cylinder, it
causes the needle valve to open
Question: The cause of any cold section in a steam heating system may be
Correct Answer: a. a defective steam trap b. a defective air valve c. a broken valve spindle d. a closed
valve e. all of the answers: e. all of the answers
Question: Radiators can be classified as
Correct Answer: a. window, duct, or floor b. wall-hung legless, floor, and window c. legless, ductless, and
floor d. ceiling, floor, window, and legless e. floor, window, or ceiling: b. wall-hung legless, floor, and
window
Question: Push nipples
Correct Answer: a. Are used to connect pipes together in a heating system b. Connect radiator sections
together c. seal tighter than unions d. Are tapered in the middle e. Have decreasing cross-sectional areas
from one end to the other: b. Connect radiator sections together
Question: The main source of trouble in convectors are
Correct Answer: a. air traps b. connecting rods c. all of the answers d. valves and traps e. air vents: d.
valves and traps
Question: If the water level falls below the gauge glass during operation of a steam heating boiler, the
operator should
Correct Answer: a. tell supervisor b. add more water immediately c. blow down the boiler d. shut the
boiler down e. operate the safety valve: d. shut the boiler down
Question: Unit ventilators are
Correct Answer: a. Ceiling suspended unit heaters b. Floor radiators c. Baseboard type heaters d. Cabinet
type heaters e. Ceiling mounted unit heaters: d. Cabinet type heaters
Question: The device which allows condensate to drain from a steam heater but stops the steam from
escaping is called a
Correct Answer: a. radiator b. radiator trap c. air vent d. convector e. air separator: b. radiator trap
Question: Causes of insufficient steam supply to the heating units can be attributed to a. improper pitch b.
clogging of connections and valve c. all of the answers d. none of the answers e. defective radiator valve
Correct Answer: c. all of the answers
Question: Another name for a unit ventilator is a
Correct Answer: a. uninvent b. convector c. exhauster d. radiator e. register: a. uninvent
, Question: Who can balance a heat system
Correct Answer: a. knowledgeable person with proper tools b. chief engineer c. operator d. shift
supervisor e. non of the answers: a. knowledgeable person with proper tools
Question: When starting up a steam heating boiler it should be filled to
Correct Answer: a. of a gage glass b. of a gauge glass c. the lowest visible part of the gauge glass d. of a
gauge glass e. the maximum level: b. of a gauge glass
Question: In the case of radiators and convectors, the main sources of trouble are the
Correct Answer: a. valves and traps b. connecting rods c. push nipples d. air traps e. air vents: a. valves
and traps
Question: A radiator trap is a device that is used to
Correct Answer: a. allow only water to leave the radiator b. allow only steam to leave the radiator c.
depressurize a radiator d. vent steam from the radiator e. allow only air to leave the radiator: a. allow only
water to leave the radiator
Question: Hand operated pet cocks on heating systems used for expelling air have been superseded by
Correct Answer: a. check valves b. diverters c. steam traps d. automatic air vents e. pipe siphons: d.
automatic air vents
Question: Hand operated pet cocks for expelling air from heating systems have been superseded by
Correct Answer: a. Automatic air vents b. Check valves c. Pipe siphons d. Diverters e. Steam traps: a.
Automatic air vents
Question: In fin coil type heaters, individual room temperature is controlled by
Correct Answer: a. switches b. supply ducts c. automatic valves d. air relays e. dampers: e. dampers
Question: Unit heaters differ from convectors in that they use _______ to increase heat transfer. a. blowers
b. copper tubes c. natural circulation d. brass tubes e. metal fins
Correct Answer: a. blowers
Question: Excessive makeup water to the condensate return tank can be caused by
Correct Answer: a. automatic makeup valve sticking open b. the feedwater being too cold c. oversized
piping d. too low a firing rate e. manual makeup valve closed: a. automatic makeup valve sticking open
Question: Another name for the one pipe steam system heating system is
Correct Answer: a. pressure system b. divided-pipe system c. vacuum system d. air vent system e. vapor
system: d. air vent system
Question: Unit ventilators
Correct Answer: a. use a mixture of inside and outside air b. use natural draft c. use only outside air for
heating d. have no damper e. use only inside air for heating: a. use a mixture of inside and outside air
Question: In a gravity return system the boiler should be placed
Correct Answer: a. well below the lowest radiator b. in a central location c. on an elevated platform d. at
the same level as the radiators e. well above the highest radiator: a. well below the lowest radiator
Question: Slow or insufficient heat throughout a building heated by steam can be caused by
