Engineering, Control Systems. Test 61

What approximate diameter is the work piece machined to before external thread cutting?

Slightly less than the outside thread diameter.
It doesn't matter as long as it's within 0.2mm of the thread diameter.
To slightly more than the outside thread diameter.
To the outside thread diameter.

The latest obtained system values are fed into the computer and compared with previous ones. The analysis obtained before has to be compared with the latest analysis. This is called _____

wear down and breakdown prediction.
material fatigue and maintenance scheduling.
wear down and maintenance scheduling.
trend analysis and maintenance prediction.

By what parts is the outlet pressure Pu of this pneumatic transmitter directly controlled ?

By the restriction R.
By slight fluctuation of supply pressure.
By the stand of the valves V and B.
By spring tension in S.

What is the disadvantage of using clamps to secure work piece on the shaping machine?

Insufficient security.
Clamps may prevent tool from traversing entire work surface.
Restricts tool travel.
Table too close to toolbox.

A pressure reducing valve works according to the principle of balance of forces, in this case the force P2 acting on the membrane is in balance with the force of the _____

the ball valve.
inlet pressure P1.
the membrane spring.
the ball valve spring.

The valve positioner acts on the principle of the balance of forces. The tension of part _____ ( _____ ) is to be in balance with the force of the controller pressure which acts on part _____ ( _____ ).

9 (spring), 18 (membrane)
12 (membrane), 6 (feedback lever)
9 (spring), 11 (supply valve)
4 (relays), 12 (membrane)

The operating function of the valve on which this pneumatic valve motor is fitted will be _____

vacuum to open (negative manometer reading).
air to close (top connection).
air to open (bottom connection).
pressure to open (positive manometer reading).

If a fault occurs in this power supply system, the best and fastest way to locate this fault is by _____

checking the input voltage.
checking supply volts, fuses then the Trouble Shooting Chart.
checking the fuses.
calling the electrician.

Review Answers