Siemens Level 1 Mechanical #2

During your daily check of the machine you recognize excessive wear at a belt. There is not the right spare part at your location. What would you do?

• Use the machine as normal, wear is not a problem.

• Take a thinner belt until you get the right one.

• You do not have to take care of wear, this is done in the regular inspections.

• Tell the responsible person to buy a new one and do not use the machine until it is fixed.

• Tell the responsible person to buy a new one and use the machine as normal.

Why is it not good to change the direction of the chain constellation at the picture?

• The load would be too high for the motor.

• Chains are designed for one direction only.

• The gears are designed for one direction only.

• The upper part of the chain may come in contact with the tensioned side.

• There is no problem.

in the mechatronic subsystem shown below, when the forward contactor is activated and motor M1 rotates, which of the following statements could be true if the carriage does not move in the forward direction? Two answers are correct.

• There is no output signal from limit switch 1.

• There is no output signal from limit switch 2.

• The set screw fastening the cartridge to the input shaft is loose.

• The friction plates in the clutch are tightly set.

• The friction plates in the clutch are loosey set.

A block diagram of an elevator drive train is shown below. The elevator no longer reaches it maximum speed. What are the possible causes? Two answers are correct.

• The ASM reached it operating temperature.

• The converter detected an overload current and reduced its output frequency.

• The line frequency broke down.

• The transmission ratio of the gearbox changed.

• The cabin is empty.

An electrical machine overheats during operation. What could be the cause? Two answers are correct.

• None of the answers given.

• There is a malfunction in the cooling system.

• The supply voltage broke down.

• The load has decreased.

• The load has increased.

Two slightly different induction motors are shown. What is the difference between them?

• Both are water cooled.

• The one on the left is self ventilated, the one on the right is forced ventilated.

• The one on the left rotates in reverse direction.

• The one on the right contains power electronics.

• The one on the left is designed for much higher power output.

The block diagram of a system driving a conveyor belt in a production line is shown below. Which statement about the time to move the object from A to B is correct?

• None of the other answers.

• The time does not depend on the pulleys diameter.

• The time is inversely proportional to the weight of the object.

• The time is independent of the air poles of the synchronous machine.

• The time does not depend on the converters output frequency.

Which statements about the installation and adjustment of the synchronous belt drive shown below are correct? Two answers are correct.

• The alignment of the pulleys can also be measured by a belt tension tester.

• If the pulleys are not aligned, the belt will always run up against the pulley flanges causing excessive belt wear.

• The alignment of the pulleys must be adjusted separately.

• If both pulleys are aligned, all four edges of the pulleys (1,2,3, and 4) should be touching the straight edge.

• If the pulleys are not aligned, the belt is kept automatically in the center of the drive.