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tsm 363 Exam 3 - Agricultural and Biosystems Engineering...

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Agricultural and Biosystems Engineering Dept. Iowa State University 11/16/06 SKW TSM 363 - Exam 3 1 - 8 !h x 11 formula sheet (both sides) Multiple Choice: 2 points each (40%) 1) To use a thermostat to control a heater, connect to common and close-on-rise common and close-on-fall c close-on-fall and close-on-rise %) d) (a) or (b) depending on what temp you are working at d) none of the above 3) An electric motor is controlled by a start-stop station through a magnetic motor starter. When the stop button is pushed, the motor stops, but re-starts when the button is released. Probable cause: a) an overload switch stuck open. b coil short-circuited. d auxiliary contacts stuck closed. d) auxiliary contacts stuck open. e) none of the above 4) Which value is closest to the level of illumination in this room now? a 30 fc 5) An oscilloscope is: @ An instrument used to make voltage changes visible over time. Page 1 of 5
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6) The active element in a humidistat is a a microswitch d a strip of nylon c) a metal diaphragm d) a fluid - filled bellows 7) How many phase sequences are possible on a 3-phase power system? a) 1 8) A 4-bit binary number has the following number of possible combinations of 0's and 9) The line-to-line voltage on a 3-phase wye system is commonly ($ ;:: 3;:
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