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FREE AND STUDY GAMES ABOUT MOTOR CONTROL CH 5
EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -17 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: 2. To step down from 480V Ac to 120 V AC, the primary windings are
connected in ___ and the secondary windings are connected in ___.
Answer:
series, parallel Question 2: 10. Some industrial applications require fuse protection on one ___ line and in both ___ lines.
Answer:
secondary, primary Question 3: 12. AC circuits of ___ V or more must be grounded in accordance with the National Electrical Code (NEV) Section 250.
Answer:
50 Question 4: 16. List the two methods to troubleshoot control transformer failures.
Answer:
measure input output, measure winding resistence
Question 5: 17 Complete the wiring diagrams
Answer:
p 17 Question 6: 1. When the terminals on a control transformer have to be linked by wire, the __- wire types and sizes should be used.
Answer:
manufactured/ recommended Question 7: 13. Control transformer suppliers recommend fuse sized based on the ___
Answer:
NEC Question 8: 15. Voltage measurements should be made in the ___ condition and the ___ condition.
Answer:
no load, full load Question 9: 14. The ___(grounded/floating) system is the most common for industrial control applications.
Answer:
grounded Question 10: 8. Control transformers generally have overcurrent protection provided by ___ or ___.
Answer:
fuses or breakers Question 11: 11.The use of fuses on the primary and secondary side of a control transformer is specified by the ___
Answer:
NEC
Question 12: 4. Generally, control transformers step down the main line voltage to a control voltage of ___ or ___VAC
Answer:
120, 24
Question 13: 7. The NEMA standard specifies that AC magnetic motor starting devices must function at voltages as low as ___ % of the rated coil voltage.
Answer:
85%
Question 14: 3. Control trasformers are rated in ___.
Answer:
VA Question 15: 9. List three common installation configuration options for control transformer fuse blocks
Answer:
fuse clips, panel mounted fuse holders, DIN rail mounted fuse holders p77 Question 16: 5. The wiring terminals of a control transformer are connected together with a metal clip to minimize the ___
Answer:
voltage drop across the connection Question 17: 6. List three factors which determine proper transformer size requirements.
Answer:
total steady state, total in rush, in rush load power factor.
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