please answer all questions asked in the picture thank you 6. In an equal-percen
ID: 2293477 • Letter: P
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please answer all questions asked in the picture thank you 6. In an equal-percentage valve: a) The b) The change in opening of the valve is high at low signal percentage, then decre high signal percentages percentage opening of the valve equals the percentage signal applied fow increases slowly at low valve openings, then more rapidly as it nears fully The valve size is a fixed percentage of the line diameter. -oper Correct answer: 7. Rangeability of a control valve refers to: a) The range of the control input signal from 0 % to 100 % b) The range of stroke over which the valve characteristic is within specification c) The range of flows from full pressure to minimum pressure d) The minimum flow as a percentage of normal flow Correct answer: 8. A suitable type of valve for control of a corrosive liquid is a: a) b) c) d) Gate valve Saunders valve Reduced trim cage valve Multi-orifice cavitation control trim cage valve Correct answer 9. The objective of a closed loop control system following a disturbance is to: a) b) c) d) Minimise maximum error. Minimise settling time Minimise residual error (offset). All of the above. Correct answe The compromise response often used in tuning control loops is: a) Critical response to a step input b) 4 time response. c) 4 amplitude damped response. d) An 'S' curve response to a ramp input 10.Explanation / Answer
Answer :- 6) Option C is the correct answer. Equal percentage valve flow starts slowly intially and rapidly increases with opening of valve.
Answer :- 7) Option C is the correct answer. Rangeability is the ratio of maximum controllable flow to minimum controllable flow.
Answer :- 8) Option B is the correct answer. Saunders Diaphragm Valves are used for corrosive liquids.
Answer :- 9) Option D is the correct answer. Closed loop control system has objectives like-
1. Reduce error
2. Increase stability
3. Increase or decrease sensitivity
4. All points in the question
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