Process Instrument and Control Engineering Online Quiz Questions test2

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1. The Ringelmann chart is associated with measurement of:
smoke density	S02 and S03
NO	CO

2. The pH value is a measure of hydrogen ionin a solution. The letters pH stand for :
percentage of H2 in solution	power of the hydrogen ion concentration
presence of hydrogen ions	purity of H20

3. The density can be measured using :
weight	buoyancy
hydrostatic head	all of above

4. Electrode potential is concerned with measurement of:
density	viscosity
chemical analysis	PH

5. Almost all pH measurements are best made with a:
glass electrode	solid state electrode
liquid ion exchange electrode	redox electrode

6. Which measurement is a good guide to the quality of the water :
conductivity	pH
dissolved 02 content	turbidity

7. The commonly used unit of conductivity is:
mho	mho/m
n mho/cm	ohm/m

8. Spectrophotometer is used to :
measure surface hardness	measure surface characteristics
measure chemical composition of alloys	analyse colour spectrum

9. The change in length of humidity sensitive elements is measured by :
hydrometer	hygrometer
psychrometer	photometer

10. The orsat apparatus is used for measuring:
chemical analysis of flue gases	moisture in air
composition of alloys	colour spectrum

11. 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 :
cross-coupling	coupling compliance
influence error	subject loading by sensor

12. Machine health monitoring is mainly based on measurement of:
lub oil pressure	vibrations at strategic points
bearing temperature measurement	efficiency and losses of machine

13. Mass-spring seismic sensors measure directly the :
displacement	velocity
acceleration	shock

14. 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 :
automatic control	feedback control
open feed back control	closed feed back control

15. 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
automatic regulator	self controller
feedback controller	two-position controller

16. The time required for the controlled variable to reach a specified value after the application of a step input is called :
rise time	settling time
response time	peak time

17. The operating characteristic which inherently assists the establishment of equilibrium is called :
corrective action	self regulation
automatic regulation	proportional control action

18. The quantity or condition of the controlled system which is directly, measured or controlled :
set point	deviation
controlled variable	command signal

19. The range of values through which the variable must change to cause the final control element to move from one extreme position to the other :
throttling range	disturbance
proportional band	response

20. The range of scale values through which the controlled variable must pass in order that the final control element be moved through its entire range :
throttling	floating band
controller band	proportional band