What is a black box?
What is swap space?
What is the difference between one-way slab and two-way slab?
What is a name function in javascript & how to define it?
Who are all involved in an inspection meeting?
What is difference between hql and sql?
What loop means?
Is php closing tag necessary?
What do you understand by the data quality services in sql server?
What’s the utilization of resource bundle properties file in struts validation structure?
What is the difference between bash and dos?
Is string an object in java?
Define sdlc in testing.
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.
regarding safety what would u consider the most important rules to observe when inspecting electrical equipment?
