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Subject : Control of Electrical Machines Scheme : M
Unit – 1, Control circuit components
NOTE : 1. The highlighted Questions are asked more than two times in the Board Exam
2. These Questions are collected from Board Examination Question Papers.
2/3 marks questions.
1. Draw the diagram of electronic
timer.
2. Compare ON delay OFF delay timer.
3. Write brief notes on latching
delay.
4. What is frequency response delay?
5. What is zero speed switch and where
it is used?
6. What is meant by automatic control
of a motor?
7. Name the types of push button switches used in
the control circuits.
8. Write the use of limit switches.
9. Draw the block diagram of ECKO
proximity switch.
10. What is sequence interlock?
11. Write the uses of float switch.
12. What
is the necessity of interlocking in drives?
13. What
is single phasing?
14. What is the function of pressure
switch in air compressor?
15. List out any our switches used in
control circuits.
10 marks questions.
1. Explain the operation of dash pot
oil filled relay with neat diagram.
2. Explain the remote control
operation of drives.
3. Draw the control circuit of
electrical interlocks and mechanical interlocks and explain briefly.
4. Explain the working of magnetic
time relay.
5. With a neat sketch, explain the
principle of operation of pneumatic timer.
6. Explain the circuit diagram the
principle of operation single phasing preventer.
7. Explain the construction and
working of latching relays.
8. Draw and explain the principle of
operation of electronic timer.
9. Explain (i) limit switches &
(ii) pressure switches
10. Explain the constructional details
of solenoid type contractor with neat sketch.
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