Who was the first woman President of Indian National Congress? 1 Annie Besant 2 Aruna Asaf Ali 3 Sorojini Naidu 4 Vijayalakshmi Pandit
12 23880. India earns maximum foreign exchange by the export of : (1) tea (2) sugar (3) iron (4) jute
13 35247Comparative difference between 33Kv & 66KV for transmitting the load of 7 MW at a distance of 34 Km.
6 15328i am P.SURESH(B.Tech-Mechanical) i need previous ouestion papers of NHPC-National Hydroelectric Power Corporation Limited,please get me.
1 4316Post New NHPC Interview Questions
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A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.
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