Diploma in EEE Study Material | CONTROL OF ELECTRICAL MACHINES Unit 3 | Yuvasallinfo
Diploma in EEE Study Material | CONTROL OF ELECTRICAL MACHINES Unit 3 | Yuvasallinfo
CONTROL OF ELECTRICAL MACHINES Study Material, Diploma Study Material ,INDUSTRIAL CONTROL CIRCUITS 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
INDUSTRIAL CONTROL CIRCUITS
Unit 3 Important 2 Marks
1. What is planner machine?
2. In a planer machine, what will happen if the right hand side limit switch does not actuate?
3. How does the bed of a planer machine change direction when the bed reaches its right
extreme (or) left extreme?
4. How will you start the planner machine, if the bed stops in between the limit switches due
to power failure?
5. What is the use of clutch in planner machine?
6. What is the use of skip hoist in industry?
7. What is need of time delay relay in skip hoist control?
8. List the type of switch or sensor required for automatic control of water pump?
9. What is the purpose of pressurised air in an overhead tank?
10. What are the various methods used to control the heat in the electric oven?
11. What are the methods of temperature control in electric oven?
12. List any uses of electrically heated oven in an industry?
13. What will happen if air reservoir pressure switch in an air compressor fails to actuate?
14. Name the pressure switches used in air compressor control circuit.
15. What will happen if the unloading relay does not energise in an air compressor?
16. Give the uses of pressure switch in air compressor.
17. What is the use of over head crane?
18. What is the necessity of providing power limit switches in overhead cranes?
19. What is the necessity for single phasing contactor control of overhead crane?
20. What is the reason to start the conveyor motors in sequence manner?
21. What is the use of elevators?
22. What are the push buttons and indicator available in an elevator (lift) control?
23. Draw the various limit switch contact position when the lift car (elevator) is at 3rd floor.
24. State any four trouble spot in control circuit.
25. What problems are caused by loose connection in control and power connection?
26. Why should you never file a contact?
27. What is meant by incorrect wire marker in control circuit?
28. What conditions lead to a low voltage problem in small shops?
Unit 3 Important 3 Marks
1. Draw the schematic diagram of planner machine.
2. Draw the schematic diagram of skip hoist.
3. Draw the schematic diagram of over head pressure tank.
4. List the industrial applications of Electric Oven.
5. Explain the temperature control in electric oven using series-parallel connection of heater element.
6. Explain the temperature control in electric oven using star-delta connection of heater element.
7. Draw the control circuit of temperature control in electric oven using star-delta connection of heating elements.
8. Briefly discuss about testing of fuses using voltmeter.
9. List the types and example of combination problem as applied to machine control.
10. Discuss the merits and demerits of using a control supply with grounded and ungrounded neutral.
11. Draw a sketch explaining detection of ground fault using a test lamp.
Unit 3 Important 10 Mark Questions
1. Explain the mechanical arrangement and control circuit of planner machine.
2. Explain the mechanical arrangement and control circuit of a skip hoist control.
3. Explain the schematic arrangement and control circuit of automatic control of water pump.
4. Draw and explain the control and main circuit of series – parallel connection of heating elements used in electric oven.
5. Draw and explain the control and main circuit of star-delta connection of heating elements used in electric oven.
6. Draw the control circuit of Over head crane and explain its sequence of operation.
7. Draw the control circuit of Compressor Motor and explain its sequence of operation.
8. Draw the control circuit of Conveyor system and explain its sequence of operation.
9. Draw the control circuit of an elevator and explain its sequence of operation.
10. Briefly discuss about different trouble spots in control circuit.
11. Explain with the control circuit how indication lamps are used to denote which of the control line has got grounded in an ungrounded control supply scheme.
12. Briefly discuss about general procedure for trouble shooting in control circuit.