FREE AND STUDY GAMES ABOUT ELEC 151 FINAL EXAM

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FREE AND STUDY GAMES ABOUT ELEC 151 FINAL EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -137 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: _____ interlocking may be used in either or both mechanical or auxiliary interlocking.

Answer:

Pushbutton

Question 2: ____ and _____ are used to adjust the height of a machine.

Answer:

Shims, spacers Question 3: The main difference between a contactor and a motor starter is the addition of ____ to the motor starter.

Answer:

Overloads

Question 4: The main device in an overload relay is the ____?

Answer:

Eutectic Alloy tube

Question 5: When troubleshooting a reversing circuit, the voltage must be within _____% of the control circuit rating.

Answer:

10 Question 6: Copper contacts have been replaced with ____ alloy contacts because of the problems of using copper with knife switches.

Answer:

Low-resistance silver

Question 7: _____ is work that is planned and scheduled for completion.

Answer:

Scheduled maintenance.Question 8: A ____ is a solid-state control device that controls an industrial process or machine.

Answer:

Programmable Logic Controller (PLC) Question 9: The current rating of a contactor or motor starter is the rating for _____?

Answer:

Each individual contact Question 10: A ____ is a circuit that protects contacts by providing a nondestructive path for generated voltage as switch is opened.

Answer:

Contact protector circuit

Question 11: The accuracy of ____ alignment is approximately 1/64".

Answer:

Straightedge Question 12: Typical mechanical life ratings for electromechanical relays are between ____ and ____ operations.

Answer:

• million to 10 million

Question 13: A ____ bearing is an antifriction bearing that permits free motion between a moving part and a fixed part by means of balls confined between inner and outer rings.

Answer:

Ball Question 14: The three stages that a motor must go through in normal operation are resting, starting, and _____?

Answer:

Operating

Question 15: ____ may be offset or angular.

Answer:

Misalignment Question 16: An ____ relay is an SSR that allows the load to be turned ON at any point on the AC sine wave.

Answer:

Instant ON switching Question 17: As ambient temperature increases, _____ current is needed to trip overload devices.

Answer:

Less Question 18: A drum switch is not considered a motor starter because the switch does not contain _____?

Answer:

Protective overloads

Question 19: A dielectric absorption test is performed over a ____-min period.

Answer:

10

Question 20: When a starter is set for ____, the motor gradually accelerates over a programmable time period.

Answer:

Soft start Question 21: A ____ is a resistor whose resistance is inversely proportional to the voltage applied to it.

Answer:

Varistor Question 22: ____ contacts are contacts that break the electrical circuit in two places.

Answer:

Magnetic

Question 23: Motor stopping modes include soft stop, pump control, and ____?

Answer:

Brake stop Question 24: ____ is an analysis that uses high vibration frequencies to create an image or reading.

Answer:

Ultrasonic Analysis Question 25: A ______ is the arrangement of contacts in such a way that both sets cannot be closed at the same time.

Answer:

Mechanical interlock Question 26: One of the advantages of using a double-break contact instead of a single-break contact is that a double-break contact ____?

Answer:

Has a higher contact rating in a smaller space.