Exam (elaborations)
Unit 20 Troubleshooting Electric Motors / HVAC Unit 20 Review Questions and Review Test
- Course
- Institution
Unit 20 Troubleshooting Electric Motors / HVAC Unit 20 Review Questions and Review Test
[Show more]
Seller
Follow
Studyhall
Reviews received
Content preview
Unit 20 Troubleshooting Electric Motors / HVACUnit 20 Review Questions and Review Test
1. If a sleeve bearing fails in a small, fractional horsepower motor, the motor is
generally replaced. ✔️ True.
2. An open winding in an electric motor means that ✔️ A wire in one
winding is broken.
3. There is a short circuit in an electric motor winding when ✔️ A
winding conductor is worn bare and touches another part of the conductor
that is also bare.
4. An open winding or a shorted winding can be determined with which
instrument? ✔️ An ohmmeter.
5. A decrease in resistance will cause the amperage to ✔️ Increase.
6. A ______ may be used to detect resistances in the millions of ohms. ✔️
Megohmmeter.
7. What size of resistor is recommended for shorting across an electrical
motor capacitor before checking with an ohmmeter? ✔️ A 20,000 ohm,
5 Watt resistor is recommended.
8. To determine the capacitance of a capacitor, a _____ should be used. ✔️
Capacitor tester.
9. State the physical differences between a run and a start capacitor. ✔️
A run capacitor is a metal, oil filled can, whereas a start capacitor is dry and
the shell is paper or plastic.
10. In a three-phase motor in good operating condition, the resistance
✔️ Should be the same across all three windings.
11. Describe what may happen to an electric motor if the drive belt is too tight.
✔️ A drive belt that is too tight will strain the bearings so that they wear out
prematurely.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Studyhall. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
78998 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now