Siemens Level 1 Mechanical #1

Front

Which component has to be maintained most often in a small DC machine?

Back

Brushes

Front

How could you change the direction of rotation for an asynchronous machine (ASM) with squirrel cage?

Back

Exchange two terminals with each other

Front

What happens with a series-wound DC machine if the clutch is suddenly opened during operation?

Back

The speed could get very high and probably destroy the machine.

Front

The switching frequency of a power electronic for a DC machine is set to 2 kHz. This could cause:

Back

Annoying noise.

Front

The speed of a synchronous machine is higher than written in the data sheet. What could be the reason?

Back

The frequency of the three-phase voltage is too high.

Front

Which rolling contact bearings can absorb thrust forces from at least one side?

Back

Bearing a, c and d.

Front

Which statement about the gear train is not correct?

Back

The rotation speed of the upper shaft is smaller than the speed of the lower shaft.