On-off controllers are normally used for

Process degree of freedom indicates __________ number of controllers to be used.

A

The maximum

B

The minimum

C

Both maximum and the minimum

D

Nothing about the

Positioning controllers are used for

A

Low loads

B

Temperature changes

C

High loads

D

Flow rate changes

Computer-based controllers:

A

should be built in a modular fashion wherever possible

B

are very difficult to change

C

are very flexible

D

(a) and (c) above

E

None of the above

Analog and digital controllers:

A

cost the same to build

B

accept the same input signals

C

can be changed with equal case

D

All of the above

E

None of the above

Today, programmable controllers:

A

are more powerful then the first controllers on the market

B

are relatively low cost compared with the original digital equipment available for industrial control

C

can be cost effective even when replacing just a few relays

D

All of the above

E

None of the above

Which of the following controllers has maximum offset?

A

P-controller

B

P-I controller

C

P-D controller

D

P-I-D controller

Which of the following controllers has the least maximum deviation?

A

P-controller

B

P-I controller

C

P-I-D controller

D

P-D controller

Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

A

63.2

B

87.5

C

95

D

100

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

A

Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller

B

Maintaining vacuum on tube side is more difficult than that on the shell side

C

Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam

D

Condenser can act as a storage unit for condensed steam

Coffee A costs 75 cents per pound. It is mixed with Coffee B, which normally costs 80 cents per pound, to form a mixture that costs 78 cents per pound. If there are 10 pounds of the mix, how many pounds of Coffee A were used in the mix?

A

3

B

4

C

4.5

D

5

On-off controllers are normally used for

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