Power Engineering - 4B9, 4B10 Practice Questions With
Complete Solutions
Dampers in air handling systems
a. may only be manual and modulating
b. may be modulating, manual, or two position
c. may only be two position
d. may only be modulating
e. may only be manual and two position
b. may be modulating, manual, or two position
Air louvers
a. are suited for two position damper operation
b. are often used for mixing boxes
c. are always used for fire and smoke dampers
d. are used in fresh air intake openings to minimize the amount
of water and snow entering the air handling system
e. are used as relief dampers
d. are used in fresh air intake openings to minimize the amount
of water and snow entering the air handling system
Supply air duct leakage loss calculations include
a. 5% leakage loss when all the supply air duct is outside the
conditioned space
b. 10% leakage loss when some of the supply air duct is outside
,the conditioned space and some inside
c. 10% leakage loss when all the supply air duct is outside the
conditioned space
d. losses from bare supply air ducts within the conditioned space
e. 20% leakage loss when all the supply air duct is outside the
conditioned space
c. 10% leakage loss when all the supply air duct is outside the
conditioned space
A ventilation V system leading from a fume hood in a chemistry
lab would have which duct material used for its ductwork?
a. Fiberglas
b. Cement asbestos
c. Aluminum sheet metal
d. Black steel sheet metal
e. Galvanized steel sheet metal
b. Cement asbestos
Duct liners
a. reduce fire hazard
b. increase the pressure
c. reduce the noise level of air flowing in the duct system
d. eliminate corrosion
e. increase erosion to the duct
c. reduce the noise level of air flowing in the duct system
,The main function of an air conditioning duct system is
a. to transmit supply and return air between the air handling
apparatus and the space to be conditioned
b. to only transmit supply air from the air handling apparatus
c. to only transmit air to the refrigeration compressor
d. to only transmit return air from the space to be conditioned
e. to transmit air from the refrigeration compressor to the
condenser
a. to transmit supply and return air between the air handling
apparatus and the space to be conditioned
The purpose of dampers in an air handling system is
a. to control the flow of air
b. to regulate refrigeration compressor speed
c. to control the flow of water in a hot water heating system
d. to control the flow of water in a water cooling system
e. to regulate the fire in heating boilers
a. to control the flow of air
A slope of 1 in 7 is used for the purpose of _________.
a. sizing duct elbows
b. change in metal thickness
c. installing duct support
d. allowing condensation inside the duct to drain
e. gradual change in duct size
e. gradual change in duct size
, Ducts passing through a nonconditioned space must be insulated
to prevent _________.
a. keep the noise down in the nonconditioned space
b. heat loss
c. excessive heat loss or gain and condensation
d. formation of cold air pockets
e. heat gain
c. excessive heat loss or gain and condensation
Ducts of large dimensions must be diagonally creased to
a. provide stiffness
b. allow gradual duct size change
c. decrease duct weight
d. decrease air friction in the duct work
e. increase air velocity
a. provide stiffness
Fibreglass ducts are used
a. in high pressure systems
b. to handle air with high moisture levels or oil and grease
c. where high strength is required
d. in some low pressure systems
e. where its heavy weight is not a problem
d. in some low pressure systems
Complete Solutions
Dampers in air handling systems
a. may only be manual and modulating
b. may be modulating, manual, or two position
c. may only be two position
d. may only be modulating
e. may only be manual and two position
b. may be modulating, manual, or two position
Air louvers
a. are suited for two position damper operation
b. are often used for mixing boxes
c. are always used for fire and smoke dampers
d. are used in fresh air intake openings to minimize the amount
of water and snow entering the air handling system
e. are used as relief dampers
d. are used in fresh air intake openings to minimize the amount
of water and snow entering the air handling system
Supply air duct leakage loss calculations include
a. 5% leakage loss when all the supply air duct is outside the
conditioned space
b. 10% leakage loss when some of the supply air duct is outside
,the conditioned space and some inside
c. 10% leakage loss when all the supply air duct is outside the
conditioned space
d. losses from bare supply air ducts within the conditioned space
e. 20% leakage loss when all the supply air duct is outside the
conditioned space
c. 10% leakage loss when all the supply air duct is outside the
conditioned space
A ventilation V system leading from a fume hood in a chemistry
lab would have which duct material used for its ductwork?
a. Fiberglas
b. Cement asbestos
c. Aluminum sheet metal
d. Black steel sheet metal
e. Galvanized steel sheet metal
b. Cement asbestos
Duct liners
a. reduce fire hazard
b. increase the pressure
c. reduce the noise level of air flowing in the duct system
d. eliminate corrosion
e. increase erosion to the duct
c. reduce the noise level of air flowing in the duct system
,The main function of an air conditioning duct system is
a. to transmit supply and return air between the air handling
apparatus and the space to be conditioned
b. to only transmit supply air from the air handling apparatus
c. to only transmit air to the refrigeration compressor
d. to only transmit return air from the space to be conditioned
e. to transmit air from the refrigeration compressor to the
condenser
a. to transmit supply and return air between the air handling
apparatus and the space to be conditioned
The purpose of dampers in an air handling system is
a. to control the flow of air
b. to regulate refrigeration compressor speed
c. to control the flow of water in a hot water heating system
d. to control the flow of water in a water cooling system
e. to regulate the fire in heating boilers
a. to control the flow of air
A slope of 1 in 7 is used for the purpose of _________.
a. sizing duct elbows
b. change in metal thickness
c. installing duct support
d. allowing condensation inside the duct to drain
e. gradual change in duct size
e. gradual change in duct size
, Ducts passing through a nonconditioned space must be insulated
to prevent _________.
a. keep the noise down in the nonconditioned space
b. heat loss
c. excessive heat loss or gain and condensation
d. formation of cold air pockets
e. heat gain
c. excessive heat loss or gain and condensation
Ducts of large dimensions must be diagonally creased to
a. provide stiffness
b. allow gradual duct size change
c. decrease duct weight
d. decrease air friction in the duct work
e. increase air velocity
a. provide stiffness
Fibreglass ducts are used
a. in high pressure systems
b. to handle air with high moisture levels or oil and grease
c. where high strength is required
d. in some low pressure systems
e. where its heavy weight is not a problem
d. in some low pressure systems
