Basic Principles of Motor Control

What is the purpose of a lockout/tagout procedure?

• To ensure the safety of workers during maintenance or repair of equipment.

• To shut down the equipment for a long period of time.

• To test the equipment's performance.

• To reset the equipment to its default settings.

Who is required to install at least one padlock during a

lockout tagout procedure?

• All the affected employees.

• The supervisor only

• All the employees working on the machine or equipment.

• Only the trainees.

Who must be advised that a lockout/tagout procedure is going to be

performed?

• The maintenance department workers only.

• The foreman only.

• All affected employees.

• All employees of the company.

What has to be done before lockout/tagout procedures can be implemented?

• Identification of hazards to which workers can be exposed

• Collection of information coming from a sufficient number of accidents.

• Wait for the government to ask the company to carry out such

  procedures.

• All of the answers above are corre

Which devices may be used to reverse the sequence of three-phase power lines?

• Toggle switch and pilot light.

• Selector switch and control relay.

• Push button and emergency button.

• Cam switch and dual contactors.

What is the name of the coil of wire around a soft iron core used to operate

magnetic contactors and relays?

• Lever

• Plunger

• Solenoid

• Drum

What are the two essential components of a magnetic motor starter?

• Auxiliary contacts and overloads.

• Pilot lights and auxiliary contacts.

• Contactors and pilot lights.

• Contactors and overloads.

What is the name of the highest current that a device can interrupt at a rated

voltage?

• Interrupting current

• Excessive current

• Overload current

• High-level current

What components offer protection against a sustained low level of excessive current?

• Fuses

• Overload relays

• Circuit breakers

• Solenoids

What phenomenon happens immediately after full voltage is applied to start a motor?

• Full-load current

• Pressure overload

• Mechanical overload

• Inrush current