DC THIRD CLASS STATIONARY BOILERS 323
EXAM 2026 COMPREHENSIVE PRACTICE TEST
COLLECTION
◉ The expansion tank on a closed loop system should be located?
Answer: On the suction side of the pump
◉ What is the primary purpose of a crank case heater on a
reciprocating chiller? Answer: To prevent refrigeration migration
◉ What is meant by the percent of (skip, step, and slip) in a pump?
Answer: Percentage of flow compared minimum speed and full
speed
e. The difference in theoretical capacity compared to the actual
capacity
◉ Which of the following types pump can be started with the
discharge value closed? Answer: Centrifugal
◉ The vertical distance from the center line of the pump up to top
level of the supply tank is called? Answer: Static suction head
,◉ 59. Answer: Where in a system is a foot valve value installed and
what is its purpose?
◉ In a multi-zone air handling unit, the zone thermostat controls the
zone temperature by? Answer: Dampers that control the air flow
from the hot & cold deck
◉ What is meant by a pump becoming steam bound? Answer: When
the static pressure at the suction of the pump falls below the vapor
pressure corresponding to its temperature.
◉ 62.Which of the following is a positive displacement pump?
Answer: Reciprocating
◉ The heart of a refrigeration system is the _______? Answer:
Compressor
◉ Refrigerant flow into the evaporator is controlled by ___________?
Answer: A metering device
◉ What does the whistle on the top of the water column indicating?
Answer: High and low water condition
, ◉ 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? Answer: 4 = 4:1 2nd
choice
◉ The part of the refrigeration system that absorbs heat into the
system is controlled by the ______? Answer: Evaporator
◉ A replacement refrigerant for R-12 medium and high temperature
refrigeration application is _____? Answer: 134 A
◉ The color for an R-134 a refrigerant cylinder is _______? Answer:
Light Blue
◉ The color for an R-410 a refrigerant cylinder is _______? Answer:
Rose
◉ Which of the following is a hanged joint between two or more
_____ furnace and may be located in the center of the furnace, with
_______ than 18-inches an apart? Answer: Adamson ring page
BOG
◉ Which of the following statement is true concerning fire tube and
water tube boilers? Answer: A water tube boiler's biggest advantage
EXAM 2026 COMPREHENSIVE PRACTICE TEST
COLLECTION
◉ The expansion tank on a closed loop system should be located?
Answer: On the suction side of the pump
◉ What is the primary purpose of a crank case heater on a
reciprocating chiller? Answer: To prevent refrigeration migration
◉ What is meant by the percent of (skip, step, and slip) in a pump?
Answer: Percentage of flow compared minimum speed and full
speed
e. The difference in theoretical capacity compared to the actual
capacity
◉ Which of the following types pump can be started with the
discharge value closed? Answer: Centrifugal
◉ The vertical distance from the center line of the pump up to top
level of the supply tank is called? Answer: Static suction head
,◉ 59. Answer: Where in a system is a foot valve value installed and
what is its purpose?
◉ In a multi-zone air handling unit, the zone thermostat controls the
zone temperature by? Answer: Dampers that control the air flow
from the hot & cold deck
◉ What is meant by a pump becoming steam bound? Answer: When
the static pressure at the suction of the pump falls below the vapor
pressure corresponding to its temperature.
◉ 62.Which of the following is a positive displacement pump?
Answer: Reciprocating
◉ The heart of a refrigeration system is the _______? Answer:
Compressor
◉ Refrigerant flow into the evaporator is controlled by ___________?
Answer: A metering device
◉ What does the whistle on the top of the water column indicating?
Answer: High and low water condition
, ◉ 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? Answer: 4 = 4:1 2nd
choice
◉ The part of the refrigeration system that absorbs heat into the
system is controlled by the ______? Answer: Evaporator
◉ A replacement refrigerant for R-12 medium and high temperature
refrigeration application is _____? Answer: 134 A
◉ The color for an R-134 a refrigerant cylinder is _______? Answer:
Light Blue
◉ The color for an R-410 a refrigerant cylinder is _______? Answer:
Rose
◉ Which of the following is a hanged joint between two or more
_____ furnace and may be located in the center of the furnace, with
_______ than 18-inches an apart? Answer: Adamson ring page
BOG
◉ Which of the following statement is true concerning fire tube and
water tube boilers? Answer: A water tube boiler's biggest advantage
