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27 Cards in this Set
- Front
- Back
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When installing a motor control system, it is not necessary to consider if the motor is a single phase or three phase or even the horse power the of the motor? |
False |
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The best place to look for information about a particular motor such as the horsepower voltage full load current service Factor would be in the manufacturer's specific sheet |
False |
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The manufacturer's code is law in all 50 states |
False |
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The simplest of all starting methods for a motor is across the line starting |
True |
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The most common way of controlling the speed of an alternating current motor is by using a variable frequency control machine |
True |
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The term ramping is used to describe what happens when a motor is first started and immediately jumps to full speed rotation |
False |
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The most important function of any control system is the safety factor to provide protection for the operator and other persons in the vicinity of a machine or motor |
True |
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Jogging is described as |
Applying power in short Jabs at full Voltage |
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Inching is explained as |
Applying power in short Jabs at reduced voltage |
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When reading a schematic diagram are the control components shown as they should be when the machine is turned off and D energized or are they shown as they should be when the machine is in operation? |
When the machine is turned off |
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What agency requires employers to provide a workplace free of organized hazards for its employees |
OSHA |
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Why is a circle most often used to represent a coil in a motor control schematic or ladder diagram |
The circle can be used for many things |
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What is the most important rule of safety that you must observe |
Think before you act |
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Draw a normally open float switch |
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Draw a normally closed flow switch |
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Draw a normally open temperature switch |
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Draw a normally closed pressure switch |
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Draw a normally open limit switch |
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Draw a normally open held closed float switch |
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Draw a normally open single push buttons |
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Draw a normally closed footswitch |
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The symbol shown here is for a |
Normally open contacts |
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Draw the symbol for an iron core Transformer |
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Draw the symbol for a three position selector switch |
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Explain manual control |
The operator must physically go to the motor. The starter is in series with the motor |
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Explain semi-automatic |
The operator does not have to be near the motor to hit the start switch. The operator must still perform some actions. |
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Explain automatic |
Similar to semi-automatic, operator just pushes start. The motor does the rest |
