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Electric Motors Controls BOMA Pre-Quiz 1. How does a U.P.S. (Uninterruptible power supply) work?: AC rectified to DC batteries then Inverted to AC$10.99
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1. How does a U.P.S. (Uninterruptible power supply) work?ANS
AC rectified to DCbatteries then Inverted to AC
2. Batteries energy capacity is measured in?ANS
Amp-hours
3. Batteries have two rated values.ANS
Voltage and amp-hours
4. How do you top off water in a battery cell?ANS
Distilled water when the level isbelow the plate.
5. A voltage monitor relay is used for?ANS
Starting backup generators.
6. Fuel for diesel generators is often stored in a?ANS
Day tank
7. converts between electrical and mechanical power.ANS
Motor, Generator,alternator.
8. The field winding on a generatorANS
ANS
Produces the magnetic field.
9. The stationary members of a generator is called aANS
Stator
10. A motorANS
Converts electrical energy into mechanical energy.
11. an armature isANS
The movable portion of a contractor.
12. In a process control, delay isANS
ANS
The time it takes for a change in the process tobe felt.
13. What is the difference between a contactor and a starter?ANS
A starter hasoverload protection
14. How is a holding circuit wired?ANS
Stop push buttons I series,Start push buttons in parallel,
Using a holding contact.
15. What protects circuits from short circuits?ANS
Breakers
16. Soft-starts work by?ANS
Lowering voltage during start up
17. When a starter has a built in disconnect, we call it a?ANS
Combination starter
18. Normally closed means?ANS
There is continuity when the component is on theshelf
19. What is an example of a P.E. Switch?ANS
1/5
, Electric Motors Controls BOMA Pre-Quiz
Pressure operated electric switch.
20. The input and output power of a transformer is rated in?ANS
KVA
21. A soft start is used to?ANS
Reduce starting current
22. AC motor speed is determined by?ANS
The number of poles.
23. DC arcs.ANS
Are the most difficult to extinguish.
24. Arc chutes.ANS
Help confine the arcs.
25. The lower the NEMA rating on a contactorANS
The lower the current it can handle
26. The current rating of a contactor.ANS
The max current for each contact.
27. A contactor with two sets of contacts is?ANS
2 pole contactor
28. How do overloads protect a motor?ANS
Preventing excessive heating effects ofhigh current
29. A double-break contacts function is to reduce the current of each arc.ANS
True
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