10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CRES exam has 135 questions and runs 3 hours.
These 10 free CRES questions are organized by exam domain, so you can see how each part of the Certified Refrigeration Energy Specialist blueprint is tested. Reveal the answer and explanation under each question.
An ammonia refrigeration system operator notices that a pressure reading and temperature indication do not agree with the expected refrigerant condition. Which action is the best first step before making operating adjustments?
Correct answer: B - Verify the accuracy and calibration of the instruments being used
During a Process Safety Management review, which activity most directly supports identifying hazards before an incident occurs?
Correct answer: A - Performing a hazard analysis of refrigeration processes and equipment
A facility manager wants to compare refrigeration energy performance between months with different production levels. Which metric is most appropriate?
Correct answer: B - Energy use normalized against a relevant production or load measure
A refrigeration plant uses 500 kW of electrical power while producing 1,000 tons of refrigeration. What is the approximate kW/ton value?
Correct answer: A - 0.5 kW/ton
An operator observes unusually high compressor discharge temperature, elevated head pressure, and reduced condenser performance. Which condition is most likely?
Correct answer: B - Noncondensable gases or poor condenser heat rejection
A technician calibrates a pressure transmitter used by the control system. What is the primary reason for performing this calibration?
Correct answer: A - To ensure control decisions are based on accurate measurements
A facility is experiencing excessive refrigeration load during a product cooling cycle. Which evaluation should be performed first?
Correct answer: A - Determine the sources and magnitude of the refrigeration load
A defrost schedule is causing unnecessary energy use because evaporators are being defrosted more often than required. Which improvement best addresses the issue?
Correct answer: A - Optimize defrost timing based on operating conditions and need
A refrigeration system screen shows operating data indicating a compressor is running outside expected conditions. What skill is being tested when selecting the appropriate corrective action?
Correct answer: A - Interpreting operating data and applying refrigeration principles
A facility discovers compressed air leaks throughout the plant. Why can correcting these leaks improve energy efficiency?
Correct answer: A - Compressed air systems can require significant energy to operate
The CRES exam also covers these domains. Drill them in the full free practice test:
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