Diploma in EEE Study Material | CONTROL OF ELECTRICAL MACHINES Unit 1 | Yuvasallinfo
Diploma in EEE Study Material | CONTROL OF ELECTRICAL MACHINES Unit 1 | Yuvasallinfo
CONTROL OF ELECTRICAL MACHINES Study Material, Diploma Study Material given Below:
RATIONALE
Various control operations are to be performed on the electrical machines to suit the industrial requirements. Technician is mainly employed to look after the control panels. To make our students employable, they have to be trained in using various control components and circuits. This subject fulfils that requirement.
OBJECTIVES
To understand Electrical control circuit elements including various types of industrial switches, relays, timers, solenoids, contactors and interlocking arrangement. AC motor control circuits for acceleration control, speed control, direction control, braking control and jogging using contactors. Different control circuits for industrial applications. Basics of programmable logic controller. PLC Programming.
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CONTROL OF ELECTRICAL MACHINES
CONTROL CIRCUIT COMPONENTS
Unit 1Important 2 Marks
1. Draw the symbol of push button and selector switch.
2. List any two applications of push button switch.
3. List any two applications of selector switch.
4. Draw the symbol of drum switch and limit switch
5. List any two applications of drum switch.
6. List any two applications of limit switch.
7. Draw the symbol of pressure switch and temperature switch.
8. List any two applications of pressure switch.
9. List any two applications of temperature switch.
10. Draw the symbol of float switch and temperature switch.
11. List any two applications of float switch.
12. List the two types of proximity switch.
13. Suggest suitable type of proximity switch to sense the presence of metal object.
14. Suggest suitable type of proximity switch to sense the presence of non-metal object.
15. Define voltage relay.
16. Define D.C. series current relay.
17. List the applications of latching relays.
18. What is frequency response relay?
19. Mention the exact situation where a frequency relay is used?
20. State the name of some relays used in control circuit.
21. What is single phasing?
22. What are the two basic types of overload relays?
23. What is the advantage of magnetic overload relay when compared to thermal overload
relay?
24. What is OFF delay timer?
25. What is ON delay timer?
26. What is solenoid valve?
27. What is solid state relay?
28. State at least any two advantages of solid state relays.
29. What is meant by sealing contact?
30. What is meant by interlock contact?
31. How will you connect remote stop with local stop?
32. How will you connect remote start with local start?
Unit 1 Important 3 Marks
1. Write short note on push button switch.
2. Write short note on selector switch.
3. Write short note on drum switch.
4. Write short note on limit switch.
5. Write short note on pressure switch.
6. Write short note on temperature switch.
7. Write short note on float switch.
8. Write short note on zero speed switch.
9. What is a zero speed switch and where is it used?
10. Write short note on proximity switch.
11. Draw the block diagram of inductive proximity switch.
12. Write a brief note on over load relay.
13. State the difference between thermal overload relay and magnetic overload relay?
14. Explain why thermal timers are used only in star-delta starters.
15. Distinguish between ON delay timer and OFF delay timer
16. Discuss the principle of operation of electronic timer.
17. What are the advantages of solid state relay?
18. Draw the control circuit of simple ON/OFF motor control.
19. Draw the control circuit of local and remote control.
20. Explain the interlocking of drives in control circuit.
Unit 1 Important 10 Mark Questions
1. With a neat sketch explain the construction and operation of Limit switch and Pressure
switch.
2. Explain the construction and working of Push button and selector switch with neat
diagram.
3. Explain the construction and working of drum switch with a neat sketch.
4. With neat sketch explain the automatic water level control using float switch.
5. Explain the following: a) DC series current relay b) Frequency response relay.
6. What is single phasing? With a neat sketch, explain the operation of single phasing
preventer.
7. Explain the operation of current operated phase failure relay with a neat sketch.
8. Explain the construction and working principle of bimetallic thermal overload relay.
9. Explain the construction and working principle of magnetic dashpot oil filled relay.
10. With neat sketch explain the operation of pneumatic timer.
11. With neat sketch explain the operation of electronic timer.
12. Explain the construction and working of solenoid valve.
13. Explain the construction and working of a solenoid type contactor with a neat sketch.
14. Draw and explain,
(i) Simple ON-OFF motor control circuit.
(ii) Electrical Interlock.
15. Draw and explain the control circuit of LOCAL and REMOTE control.