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.
These 10 free FHPT-T questions are organized by exam domain, so you can see how each part of the Fume Hood Performance Testing Technician (FHPT-T) blueprint is tested. Reveal the answer and explanation under each question.
While examining an unlabeled hood, a technician lowers the vertical sash. Measured duct exhaust stays nearly constant, but face velocity rises only modestly. Room air increasingly enters an unpowered opening above the sash. These observations identify which airflow arrangement?
Correct answer: A - A bypass passage admitting room air outside the sash opening.
Repeated smoke observations at a fixed sash opening show upper-edge escape only when a heating mantle is energized. Measured exhaust flow, supply-air settings, equipment locations, and door positions remain unchanged. Switching off the mantle eliminates the escape. Which mechanism most directly accounts for this pattern?
Correct answer: A - Thermal buoyancy changes the airflow within the hood.
An SF6 ejector system was calibrated six hours ago. Before the next ANSI/ASHRAE 110-1995 test, its damaged critical-orifice plate is replaced with another plate of the same nominal bore. The pressure gauge again reads 30 psig. Which action is required specifically because the orifice plate was changed?
Correct answer: D - Recalibrate the assembled delivery system for a 4.0 L/min release.
A test requires room background to be established below 0.004 ppm. The available tracer detector has a validated detection limit of 0.01 ppm, although its display shows three decimal places. After warm-up, it repeatedly displays 0.000 ppm. What do these readings establish?
Correct answer: D - Compliance with the background requirement remains undetermined.
An as-used evaluation is intended to document a research group's normal hood configuration. The laboratory has authorized testing with the apparatus operating, and the ejector fits without rearrangement. Before the first run, the laboratory manager offers to clear the equipment and restore the baffles to their factory settings. Which preparation preserves the purpose of the evaluation?
Correct answer: C - Retain the working arrangement and document the equipment and baffle positions.
An auxiliary-air hood is specified to operate with its auxiliary supply on. At that setting, a valid tracer test gives a control level of 0.08 ppm. A separate diagnostic run with the supply off gives 0.02 ppm. The owner requires a control level no greater than 0.05 ppm, but the report declares compliance using the supply-off result. What is the essential correction?
Correct answer: D - Report noncompliance in the required supply-on condition; identify the supply-off run separately.
A hood's measured mean face velocity is 98 fpm, within the project's specified 90-110 fpm range. During the ANSI/ASHRAE 110-1995 local visualization challenge, a thin stream of smoke repeatedly crosses the sash plane into the room near the left side post. The smoke source is correctly positioned and produces no strong jet. Which conclusion belongs in the test report?
Correct answer: B - The hood fails the local visualization test and receives no rating.
A VAV response trace is synchronized to sash-motion onset at 0 seconds. The sash reaches the top at 2 seconds. Velocity first enters the required 90-110 fpm band at 3 seconds, drops to 86 fpm at 4 seconds, and remains between 96 and 103 fpm from 7 seconds onward. Using ANSI/ASHRAE 110-1995 and an owner-specified maximum response time of 5 seconds, how should the response be recorded?
Correct answer: A - 7 seconds; the response-time requirement is not met.
Commissioning of an unoccupied laboratory includes an ANSI/ASHRAE 110-1995 as-installed test at the specified sash opening and 4.0 L/min SF6 release. The left, center, and right five-minute positional averages are 0.02, 0.08, and 0.02 ppm. The highest instantaneous reading is 0.18 ppm. All validity checks are satisfactory, and the owner requires an AI control level no greater than 0.05 ppm. Select the correct static rating and disposition.
Correct answer: C - AI 0.08; the owner's control-level requirement is not met.
A setup check for the left position of an ANSI/ASHRAE 110-1995 bench-hood tracer test finds the ejector centerline 12 in from the inside left wall and the front of its body 6 in behind the hood face. The sampling probe touches the manikin's face 26 in above the work surface, but lies in the sash plane. Which single adjustment corrects the setup?
Correct answer: B - Move the manikin and probe 3 in toward the room.
The full bank has 1,020 more FHPT-T questions with explanations.
Continue in the free practice test →
View plans