Question

answer the following multiple choice questions

5. The most common phase serving . residence would be single phase bwo or double phase three phase multiple phases none of the answers provided RV9,1110 11. A KVA code letter indicates the innush current per hp. size of the short circult protectors size of the overcurrent protectors size of the thermal overloads none of the answers provided 6. RPM is the approximate speed under full-Hoad conditions when voltage is at rated value when frequency is at rated value all of the answers provided 12. A nomal-starting-torque motor would have a design letter of 7. The difference between synchronous speed of an induction molor and full-load speed is known as slip slid 13. A type of thermal protection device is known as a manual device. single shot double shot semi-auto none of the answers provided off beat under performance none of the answers provided 14. A UL-approved manual reset thermal protector would be Type A Type C • Type M • Type T Type J 8. An increase in the number of poles in a number results in lower RPM higher RPM no change in speed since it is dependent on frequency no change in speed since it is dependent on load 15. The service factor represents the motor's ablity to handle temporary higher loads. Which of the following has the greatest margin of safety? 1.0 1.15 1.25 1.3 1.4 none of the answers provided 9. The insulation class that can tolerate higher femperature than Class B is Class A Class E Class F all of the answers provided none of the answers provided 10. The insulation system class of most electric motors is rated for 5,000 10,000 • 15,000 • 20,000 none of the answers provided 16. Generally speaking, an ECM motor is more energy efficient than a PSC motor. True False hours of life.

Answer 1

Sol 5.) three phase. 6) when frequency is at rated value 7) slip 8) Lower RPM 9) Class F 10) none 11) inrush current pertip 12) A 13) single that manual. 14) Type on 15) 1-0 16) True 17) all of above Quiz- 11 all above a) 18.7 FLC ampa 3) 9.8 FLC amps- 4) 44 FLC ampe s) 1:30 6) True 7) Insulation breakdown (8) 20.5 amps (9) 31.2 amps w) 87.6 ampe (11) 25 ampe (12) ► 24 ampe (13) g amps (2.4) 90°C 115) 116) 90°C 17) 75 °C 18) 60°C -75°C (19) any colour 20) all above