Engineering, Control Systems. Test 62

How is the tool set up when thread cutting on the centre lathe?

With the shank at right angles to the work piece.
With the shank against the face of the work piece.
Using a thread gauge against the work piece.
By eye and then adjusted before the final cut.

Why is stainless steel swarf particularly hazardous?

It is very hot.
It has extremely sharp edges.
It is a continuous piece and can become caught up in the workpiece
Breaks into chips that then fly off the work piece.

Control valves in a controlled process can be either pneumatic, electrically or hydraulically operated. What kind of medium is used to control this valve ? When is it used ?

Pneumatic, when an accurate valve response is required.
Pneumatic, when a big force or torque is required.
Hydraulic, when a big force or torque is required.
Hydraulic, when an accurate valve response is required.

Why does the output (instrument supply) pressure of a reducer fluctuate ?

Because the movement of the membrane follows the input pressure.
Because of the characteristic of the spring.
Because of the variation on the output pressure.
Because of the variation of the output capacity.

The monitoring system that tests the plant for readings of the temperature, pressure etc. is called:

the loop back system.
the comparing unit.
the scanning unit.
the demand display unit.

What precaution may be necessary when using the faceplate with an irregular shaped work piece on a centre lathe?

Use hand feed.
Disconnect the lead screw.
Use a balance weight on the faceplate.
Use very low chuck speeds.

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