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Z51 REVIEW TEST QUESTIONS AND ANSWERS
(VERIFIED AND WELL-ELABORATED ANSWERS)
LATEST UPDATE 2025/2026
1. What is the minimum requirement of an engineer needs to log readings.: -
Once per shift
2. When entering phase 2 firemen service what statement is correct: The elevator operator is
the only person that can control the elevator
3. You are the only engineer on duty with the machine running a vice president tells you to shovel
snow what should you do: Do not leave the building
4. What is the responsibility of AB29 certificate of fitness holder: Inspect the battery system
5. An engineer observes a gauge to read saturation pressure of refrigerant if chilled water
circulated as the cooling medium this reading best be used to estimate the: Temperature of the
chilled water being pumped to the spaces being cooled
6. Regardless of the ASHRAE refrigeration classification in use in the event of a refrigerant escape
the engineer should be aware of: asphyxiation
7. When is a chemical fire extinguisher and system needed: Where water is not sufficient
8. What type of refrigerants found inside the machines gages: - Same type as the refrigerant inside
the machine
9. Fireproof decorations in buildings are used for -: - They don't catch fire in an emergency
10. Water regulating valves are used for: Maintain condenser pressure To a pre determined level
11. How long does it take to warm up a steam turbine: 15 minutes
12. Why is a pressure relief out better than a fusible plugs: Minimize refrigerant loss
Z51 REVIEW TEST QUESTIONS AND ANSWERS
(VERIFIED AND WELL-ELABORATED ANSWERS)
LATEST UPDATE 2025/2026
1. What is the minimum requirement of an engineer needs to log readings.: -
Once per shift
2. When entering phase 2 firemen service what statement is correct: The elevator operator is
the only person that can control the elevator
3. You are the only engineer on duty with the machine running a vice president tells you to shovel
snow what should you do: Do not leave the building
4. What is the responsibility of AB29 certificate of fitness holder: Inspect the battery system
5. An engineer observes a gauge to read saturation pressure of refrigerant if chilled water
circulated as the cooling medium this reading best be used to estimate the: Temperature of the
chilled water being pumped to the spaces being cooled
6. Regardless of the ASHRAE refrigeration classification in use in the event of a refrigerant escape
the engineer should be aware of: asphyxiation
7. When is a chemical fire extinguisher and system needed: Where water is not sufficient
8. What type of refrigerants found inside the machines gages: - Same type as the refrigerant inside
the machine
9. Fireproof decorations in buildings are used for -: - They don't catch fire in an emergency
10. Water regulating valves are used for: Maintain condenser pressure To a pre determined level
11. How long does it take to warm up a steam turbine: 15 minutes
12. Why is a pressure relief out better than a fusible plugs: Minimize refrigerant loss
