0n-off control which is a special case of proportional control, has a band width

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Question
0n-off control which is a special case of proportional control, has a band width of about __________ percent.
Options
A. 100
B. 75
C. 25
D. 0

Correct Answer

0

Process Control and Instrumentation problems

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1. For measuring the temperature of a red hot furnace, which is the most suitable instrument?
Options
A. Platinum resistance thermometer
B. Thermocouple
C. Optical pyrometer
D. Bimetallic thermometer

2. Pick out the wrong statement.
Options
A. There is no transfer lag for a single first order system.
B. Stirred tank with a water jacket exemplifies an interacting system.
C. Transfer lag is a characteristics of all higher order systems (other than first order systems).
D. Transfer lag decreases as the number of stages decreases.

5. The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function will have a definite num-ber of loci for variation of K from 0 to ?. The number of loci is
Options
A. 1
B. 3
C. 4
D. 2

7. Fixed capital investment of a chemical plant is the total amount of money needed to supply the necessary plant and manufacturing facilities plus the working capital for operation of the facilities. Which of the following components of fixed capital investment requires minimum percentage of it?
Options
A. Electrical installation cost.
B. Equipment installation cost.
C. Cost for piping.
D. Equipment insulation cost.

8. Optimum economic pipe diameter for fluid is determined by the
Options
A. viscosity of the fluid.
B. density of the fluid.
C. total cost considerations (pumping cost plus fixed cost of the pipe).
D. none of these.

9. A reactor having a salvage value of Rs. 10000 is estimated to have a service life of 10 years. The annual interest rate is 10%. The original cost of the reactor was Rs. 80000. The book value of the reactor after 5 years using sinking fund depreciation method will be Rs.
Options
A. 40096
B. 43196
C. 53196
D. 60196

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