Boma motor controls - Study guides, Class notes & Summaries

Z-51 Written Exam Questions and Complete Solutions In a steam turbine, what is the function of a Kingsbury thrust bearing? A) Maintain first stage steam pressure. B) Compensate for coupling misalignment. C) Adjust shaft torque at start up. D) Maintain axial positioning of the rotor shaft. - Answer: D) Maintain axial positioning of the rotor shaft. The ratio of actual pressure of water pressure in the atmosphere to the saturated pressure of given temperature is A) partial pressure....

Electric Motors Controls BOMA Pre-Quiz Latest Version Graded A+ How does a U.P.S. (Uninterruptible power supply) work? AC rectified to DC batteries then Inverted to AC Batteries energy capacity is measured in? Amp-hours Batteries have two rated values. Voltage and amp-hours How do you top off water in a battery cell? Distilled water when the level is below the plate. A voltage monitor relay is used for? Starting backup generators. Fuel for diesel generators is often stored ...

A 3600 RPM motor has: - ANSWER two poles If you throttled the discharge side of a centrifugal pump into closed the amps would: - ANSWER go up The common method of correcting power factor is: - ANSWER add a capacitor To convert AC to DC you would need: - ANSWER rectifier

BOMA - General Maintenance Questions and Answers Graded A+ When starting a centrifugal pump that is part of a manifold with no check valves: You should open the suction valve, start the pump and open the discharge valve slowly A valve inserted in a water line between the corporation stop and the water meter is generally called: Curb cock To check sheave wear: Measure each groove angle Variable pitch sheaves may be used in some cases to provide which of the following types of speed ...

BOMA-Instrumentation & Controls Questions and Answers Graded A+ A submaster controller resets the set point of the master controller. False Normally open refers to a controlled device that opens when no operating force is applied. True A P.E. Switch is used to change an electrical signal to a pneumatic output. False Moisture and dirt are detrimental to the operation of pneumatic control systems. True A static pressure regulator senses the pressure in the plenum the regulator contro...

How does a U.P.S. (uninterruptable power supply) work? AC rectified to DC batteries then inverted to AC Batteries energy capacity is measured in Amp-hours 6 Ways to Show Appreciation for Your Child's Teacher Batteries have two rated values: Voltage and Amp-hours How do you top off water in a battery cell? Distilled water when the level is below the plates A voltage monitor relay is used for: Starting backup generators Fuel for diesel generators is often stored in a: Day tank ______...

A _____ is used to measure electrical potential? - voltmeter A _____ is used to measure resistance? - ohmmeter A 3 way switch is essentially a? - single pole double throw switch A 4S box is the most frequently used in one of the situations shown below. Which is it? - Junction box A combination motor starter always includes? - Circuit breaker, fuse and disconnecting device A device used to measure the rotating speed of the motor is called? - tachometer A generator? - Changes mechanical pow...

BOMA - Instrumentation & Controls Questions and Answers Rated A+ What important function(s) does an air receiver perform? Dissipates heat, Dampens compressor pulsations, Act as water and oil trap On a compressed air system a safety valve would generally be installed on the: Air receiver Variable air volume system: Typically use VFDs to save energy In figure 1.3, a full call for cooling would be at what branch pressure to the damper motor? 3 psig A ratio relay would be used to. Control...

A holding contact or maintaining contact in a magnetic motor starter is normally connected in parallel with the? - ANSWER Stop push button, start push button, and starter coil The armatures of both AC and DC contactors must move freely or? - ANSWER all the contacts may weld together Which of the following devices prevent motors from drawing too much current? - ANSWER overloads The primary difference between a motor starter and a motor contactor is the starter has an? - ANSWER overload p...