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Mechanical Engineering Objective Questions { Instrumentation and Control }

29. The development of following element ha improved the reliability and the respons action of low pressure gauges :
D.Ring balance

30. Proving rings are used to measure
D.(c) acceleration

31. Which is not correct about load cells used to measure weight/force :
A.Accuracy of the order of 0.01 to 1%
B.Rugged and compact construction
C.No moving parts and negligible deflection under load
D.Low resistance to side load and low overload withstand

32. Which type of device is suitable for dynamic force measurement :
A.Lever balance
B.Spring balance
C.Proving ring
D.Piezo-electric transducer

33. Hysteresis errors in Bourdon tubes can be minimized by :
A.Selecting proper material
B.Proper design and fabrication
C.Using them well within the designed pressure range
D.. avoiding direct entry of steam into it (e) calibrating it from time to time.

34. In case of strain gauge transducers, several strain cycles, and temperature cycles are carried out before making measurements, in order to :
A.Increase life
B.Enable high repeatable readings
C.Eliminate premature failures
D.Increase accuracy

35. Accuracy of standard pressure gauges, used for testing and calibration purposes is of the order of :
A.? 1.5%
B.? 1%
C.? 0.5%
D.? 0.25%

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