FREE AND STUDY GAMES ABOUT MOTOR CONTROL 1

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FREE AND STUDY GAMES ABOUT MOTOR CONTROL 1

TEST EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -71 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: A coil of insulated or enamel covered wire with a movable metal core in the shape of a rod made of solid iron, solid, steel, or powdered iron

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Solenoid Question 2: An ? timer is a device with a preset time period that starts after the input signal is removed. The timer output contacts change when the input signal or external trigger is applied, and the contacts remain in the changed state until after the timing period.

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off-delay Question 3: Limit switches are the ???? frequently used mechanically operated input devices.

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Most Question 4: Machine control relays provide easy access for ??? maintenance and generally have a long life.

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Contact

Question 5: The capacity of ? is determined by the current ratings of their power contacts for continuous and inrush current conditions.

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motor starters Question 6: magnetically activated switching device, without an OPD attached, to switch power to a load other than an AC or DC motor. Devices have multiple power poles and offer several options to keep the contacts pulled in when coil power is removed. Some manufacturers call these "Definite Purpose" contactors.

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Definite purpose magnetic contactor Question 7: According to a 1998 Department of Energy survey, what percentage of electricity used in the United States was used to drive electric motors?

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63% Question 8: Contacts on relays that can be configured as either normally open contacts or normally closed contacts are called ? contacts.

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convertible Question 9: An ? timer is a device with a preset time period between energizing the timer or applying the input signal and the action of the timer output contacts. During the timing period, no change occurs in the timer output contacts.

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on-delay Question 10: The machine control relay have typically 2 to 8 contacts and is also called a ????or machine tool relay .

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heavy duty Question 11: As a standards organization, which of the following document formats are used with IEC standards?

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IS - International Standards and TR - Technical Reports

Question 12: Which standards organization is associated with the International Organization for Standardization (ISO)?

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IEC Question 13: Motor current is proportional to motor load and an INDICATION of the ????? in the windings. Overload relays on the motor starter monitor motor power in the circuit and open the power circuit when excessive motor current occurs.

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Heat

Question 14: NEMA's first national standards effort was called the ???

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Safe Electrical Cord Program (1929)

Question 15: IEC Machine control relays are ??? volts . Most 10A some 15A

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600 Question 16: The two parts of a pushbutton switch are the ? and the contact block.

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operator Question 17: The term interposing relay is used to describe a relay which enables the energy in a ? circuit to be switched by the ? circuit in a control system.

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high-powered / low-powered

Question 18: A solenoid is a specific type of ?

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electromagnet Question 19: Electronic timers have time delays of fractions of a second to ????? minutes

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hundreds

Question 20: Fuses and breakers protect what part(s) of the motor circuit?

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Branch circuit and control circuit components.Question 21: What organizations are the standards-setting organizations for motor control devices?

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International Electrotechnical Commission (IEC) and National Electrical Manufacturers Association

(NEMA)

Question 22: magnetically activated switching device, without an overload protection device attached, to switch single phase or three phase AC power or DC power to the load

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Magnetic contactor Question 23: A (timer) device with a preset time period between energizing the timer or applying the input signal and the action of the timer output contacts. During the timing period no change occurs in the timer output contacts.

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On Delay Timer Question 24: ??? Pressure switches measure the difference in pressure from two different sources.

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differential Question 25: ???? starters consist of a safety disconnect, short circuit and overload protection, and magnetic motor starter placed in a common enclosure.

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Combination Question 26: The On Delay time is used to apply or remove power to a load at a pre set time after the on delay timing relay is energized T/F

Answer:

True