The following question consists of six sentences of a passage. The first and the sixth sentences are given in the beginning as S1 and S6. The middle four sentences in each have been jumbled up and labelled P, Q, R and S. You are required to find the proper sequence of the four sentences and mark your response accordingly.S1: A single device can heat fluids without requiring an electrical element.S6: Because there is no electrical element, there is no risk of fire, so the system is suitable for dangerous environments.P: A heat exchanger transfers heat from the central cavity to an air heater, a water heater or an industrial processor.Q: It has a container like the crankcase of a car’s engine, which contains the fluid to be heated.R: Compression and friction at the nozzles heat the fluid so that the temperature in the central -cavity rises steadily.S: A motor and pulley inside the container turn a rotor wheel, which in turn forces the fluid again and again through narrow nozzles into a central cavity.The proper sequence should be

• A. R P S Q
• B. S P Q R
• C. Q S R P
• D. S R P Q