In an automatic control system which of the following elements is not used ?

An automatic toaster is a ______ loop control system.

A

open

B

closed

C

partially closed

D

any of the above

If A has 4 elements and B has 8 elements then the minimum and maximum number of elements in A∪B are respectively __

A

4,8

B

8,12

C

4,12

D

6,12

Which of the following devices is necessarily required for automatic temperature control in a furnace?

A

Thermostat

B

Thermocouple

C

Autotransformer

D

Heating elements of variable resistance material

In pneumatic control systems the control valve used as final control element converts

A

Pressure signal to electric signal

B

Pressure signal to position change

C

Electric signal to pressure signal

D

Position change to pressure signal

You have configured a Group Policy Object (GPO) for the marketing oranization unit (OU) to prevent users from accessing My Network Places and from running System in Control Panel. You want the Managers Domain Local Group to be able to access My Network Places, but you still want to prevent them from running System in Control Panel. What should you do?

A

Add the Managers group to the access control list of the GPO. Disable the permission of the managers group to read and apply the Group Policy

B

Add the Managers group to the access control list of the GPO. Deny the permission of the managers group to read and apply the Group Policy

C

Create a second GPO in the OU. Add the Managers group to the access control list. Allow the managers group to apply the Group Policy. Deny the Authenticated Users group permission to read and apply th

D

Create a second GPO in the OU. Add the Managers group to the access control list. Allow the managers group to apply the Group Policy. Disable the Authenticated Users group permission to read and apply

E

None of above

Which of the following selector is used to selects the elements that are the default among a set of similar elements?

A

::after

B

:disabled

C

:default

D

:checked

Which of the following selector is used to select elements that are read-only. When applied to form elements, this would select fields with the readonly attribute set?

A

:valid

B

:target

C

:read-only

D

:required

The control rods in the control system of nuclear reactors are used to

A

Absorb excess neutrons

B

Control fuel consumption

C

Control temperature

D

All of these

Which of following commands is used for an automatic reminder service?

A

write

B

mesg

C

calendar

D

mail

E

None of the above

Automatic signalling is used for which of the following trains ?

A

Mail and express trains

B

Superfast trains

C

Suburban and Urban electric trains

D

All trains

In an automatic control system which of the following elements is not used ?

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