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Mechanical Engineering Objective Questions { Instrumentation and Control }

85. The orsat apparatus is used for measuring:
A.Chemical analysis of flue gases
B.Moisture in air
C.Composition of alloys
D.Colour spectrum

86. The error caused in vibration measuring equipment due to non compliance (not stiff) of bond made between sensor and the surface it is mounted is called :
B.Coupling compliance
C.Influence error
D.Subject loading by sensor

87. Machine health monitoring is mainly based on measurement of :
A.Lub oil pressure
B.Vibrations at strategic points
C.Bearing temperature measurement
D.Efficiency and losses of machine

88. Mass-spring seismic sensors measure directly the :

89. An operation which, in the presence of a disturbing influence, tends to reduce the difference between the actual state of a system and an arbitrarily varied desired state and which does so on the basis of this difference, is called :
A.Automatic control
B.Feedback control
C.Open feed back control
D.Closed feed back control

90. An apparatus which measures the value of a quantity or condition which is subject to change with time, and operates to maintain within limits this measured value, is called
A.Automatic regulator
B.Self controller
C.Feedback controller
D.Two-position controller

91. The time required for the controlled variable to reach a specified value after the application of a step input is called
A.Rise time
B.Settling time
C.Response time
D.Peak time

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