DC 3rd Class Test | 3rd class stationary steam
engineer license prep | Stationary Engineer |
Station engineer exam | DC 1st Class Boiler |
Updated Version
An air handler unit that has hot & cold air ducts connected to (molding boxes?)
located in each building space is called a __________air handler unit? ---------
CORRECT ANSWER-----------------dual duct
An air handler unit supplies a constant supply air temperature of 55 degree F to
building spaces and includes a coil called _____air handler unit? ---------CORRECT
ANSWER-----------------terminal reheat
An air handler unit that provides heating, cooling, ventilation, and air conditioning
to more than one building or area and has its cooling & heating Coil in separate
side-by side ducts is called a _______air handling unit? ---------CORRECT ANSWER--
---------------multi-zone
In a dual duct air handling system space thermostatic controls building
temperature by? ---------CORRECT ANSWER-----------------Moving the air from the
hot & cold duct in a molding box serving the space.
,A boiler is rated at (86,250 lbs, 88,250 lbs, 96,250 lbs) of steam per hour. What is
the equivalent boiler horsepower? ---------CORRECT ANSWER-----------------2500 HP
= 86,.5 = 2500 lbs
What is the area of a steam engine cylinder reading 10 x 24, when the piston is
only travelling at 2/3 of the way? ---------CORRECT ANSWER-----------------160. (10 x
24 x 2/3 ) =160
What is the total force acting on a 4 inches diameter safety value disc with a
boiler pressure of 12 psi? ---------CORRECT ANSWER-----------------150.79 TF= P x A
The expansion tank on a closed loop system should be located? ---------CORRECT
ANSWER-----------------Suction side of the pump
What is the primary purpose of a crank case heater on a reciprocating chiller? -----
----CORRECT ANSWER-----------------To prevent refrigeration migration
What is meant by the percent of (skip, step, and slip) in a pump? ---------CORRECT
ANSWER-----------------The difference in theoretical capacity compared to the
actual capacity
,Which of the following type of pumps can be started with the discharge value
closed? ---------CORRECT ANSWER-----------------Centrifugal
The vertical distance from the center line of the pump up to the top level of the
supply tank is called? ---------CORRECT ANSWER-----------------Static suction head
Where in a system is a foot valve value installed and what is its purpose? ---------
CORRECT ANSWER-----------------A type of check value located below the normal
level of the tank attached to the end of the suction line of the pump, used to keep
suction line full to facilitate starting.
In a multi-zone air handling unit, the zone thermostat controls the zone
temperature by? ---------CORRECT ANSWER-----------------Dampers that control the
air flow from the hot & cold deck
What is meant by a pump becoming steam bound? ---------CORRECT ANSWER------
-----------When the static pressure at the suction of the pump falls below the vapor
pressure corresponding to its temperature.
Which of the following is a positive displacement pump? ---------CORRECT
ANSWER-----------------reciprocating
, What does the whistle on the top of the water column indicating? ---------
CORRECT ANSWER-----------------High and low water condition
The heart of a refrigeration system is the _______? ---------CORRECT ANSWER------
-----------compressor
Refrigerant flow into the evaporator is controlled by ___________? ---------
CORRECT ANSWER-----------------Metering device
A reciprocating compressor operating with refrigerant R-410 head pressure of 476
psi and a suction pressure of 118 psi. What is the compressor's compression
ratio? ---------CORRECT ANSWER-----------------3.7 476+14.+14.7 = 3.760
The part of the refrigeration system that absorbs heat into the system is
controlled by the ______? ---------CORRECT ANSWER-----------------evaporator
A replacement refrigerant for R-12 medium and high temperature refrigeration
application is _____? ---------CORRECT ANSWER-----------------134 A
engineer license prep | Stationary Engineer |
Station engineer exam | DC 1st Class Boiler |
Updated Version
An air handler unit that has hot & cold air ducts connected to (molding boxes?)
located in each building space is called a __________air handler unit? ---------
CORRECT ANSWER-----------------dual duct
An air handler unit supplies a constant supply air temperature of 55 degree F to
building spaces and includes a coil called _____air handler unit? ---------CORRECT
ANSWER-----------------terminal reheat
An air handler unit that provides heating, cooling, ventilation, and air conditioning
to more than one building or area and has its cooling & heating Coil in separate
side-by side ducts is called a _______air handling unit? ---------CORRECT ANSWER--
---------------multi-zone
In a dual duct air handling system space thermostatic controls building
temperature by? ---------CORRECT ANSWER-----------------Moving the air from the
hot & cold duct in a molding box serving the space.
,A boiler is rated at (86,250 lbs, 88,250 lbs, 96,250 lbs) of steam per hour. What is
the equivalent boiler horsepower? ---------CORRECT ANSWER-----------------2500 HP
= 86,.5 = 2500 lbs
What is the area of a steam engine cylinder reading 10 x 24, when the piston is
only travelling at 2/3 of the way? ---------CORRECT ANSWER-----------------160. (10 x
24 x 2/3 ) =160
What is the total force acting on a 4 inches diameter safety value disc with a
boiler pressure of 12 psi? ---------CORRECT ANSWER-----------------150.79 TF= P x A
The expansion tank on a closed loop system should be located? ---------CORRECT
ANSWER-----------------Suction side of the pump
What is the primary purpose of a crank case heater on a reciprocating chiller? -----
----CORRECT ANSWER-----------------To prevent refrigeration migration
What is meant by the percent of (skip, step, and slip) in a pump? ---------CORRECT
ANSWER-----------------The difference in theoretical capacity compared to the
actual capacity
,Which of the following type of pumps can be started with the discharge value
closed? ---------CORRECT ANSWER-----------------Centrifugal
The vertical distance from the center line of the pump up to the top level of the
supply tank is called? ---------CORRECT ANSWER-----------------Static suction head
Where in a system is a foot valve value installed and what is its purpose? ---------
CORRECT ANSWER-----------------A type of check value located below the normal
level of the tank attached to the end of the suction line of the pump, used to keep
suction line full to facilitate starting.
In a multi-zone air handling unit, the zone thermostat controls the zone
temperature by? ---------CORRECT ANSWER-----------------Dampers that control the
air flow from the hot & cold deck
What is meant by a pump becoming steam bound? ---------CORRECT ANSWER------
-----------When the static pressure at the suction of the pump falls below the vapor
pressure corresponding to its temperature.
Which of the following is a positive displacement pump? ---------CORRECT
ANSWER-----------------reciprocating
, What does the whistle on the top of the water column indicating? ---------
CORRECT ANSWER-----------------High and low water condition
The heart of a refrigeration system is the _______? ---------CORRECT ANSWER------
-----------compressor
Refrigerant flow into the evaporator is controlled by ___________? ---------
CORRECT ANSWER-----------------Metering device
A reciprocating compressor operating with refrigerant R-410 head pressure of 476
psi and a suction pressure of 118 psi. What is the compressor's compression
ratio? ---------CORRECT ANSWER-----------------3.7 476+14.+14.7 = 3.760
The part of the refrigeration system that absorbs heat into the system is
controlled by the ______? ---------CORRECT ANSWER-----------------evaporator
A replacement refrigerant for R-12 medium and high temperature refrigeration
application is _____? ---------CORRECT ANSWER-----------------134 A
