Control of Electrical machines. 14- Mark important Questions
Unit 1
1. Draw the control circuit of electrical and mechanical interlocking
and explain briefly.
2. Explain with circuit diagram the principle of operation of single
phasing preventer.
3. Explain the working principle of electronic timer.
4. Explain the working principle of Pneumatic timer.
5. Explain the working principle of solid state relay
Unit 2
6. Draw and explain the construction and working of jogging and
inching of DC motor.
7. Draw the connection diagram of two winding for two speed control
in induction motor.
8. Explain with neat circuit diagram the working of automatic star-delta
starter.
9. Explain with neat circuit diagram the working of series relay starter.
10. Explain the operation with a control circuit, how dynamic
braking is done in cage induction motor. 11. Draw the control circuit for automatic rotor resistance starter
for three phase slip ring induction motor and explain.
Unit-3
12. Explain the circuit operation of electric oven.
13. Explain skip hoist and it’s control circuit. 14. Explain the mechanical arrangements and control circuit of
automatic control of a water pump. 15. Explain air compressor and it’s control circuit.
16. Explain the trouble spot in control circuit.
Unit-4
17. Draw the schematic and wiring diagram for input/output
modules and explain.
18. Draw the Block diagram of a PLC system and explain the
function of each block.
19. Explain the process of PLC scan.
20. Explain in detail about the different programming devices.
21. Explain the various criteria for selection of suitable PLC.
Unit-5
22. Develop a ladder logic diagram for rotor resistance starter.
23. Develop a ladder logic diagram for automatic star-delta starter.
24. Develop a ladder logic diagram for DOL starter
25. Develop a ladder logic diagram for EB to generator change
over system.
26. Explain with block diagram the operation of SCADA.
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