Mechanic review Study guides, Class notes & Summaries

1. A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What sheave is required?: Diam=12" 12/4=3" 25fpm=3" 100fpm + 25fpm= 12"+3"= 15" sheave 2. A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read voltage or resistance. What should you do?: Replace it with a larger MOV 3. On a Ward-Leonard circuit the break is set, but the motor is trying to slip through the break. What is the issue?: Suicide Circuit 4. You have an old DC ...

Energizing a relay coil ____ contacts that were normally open and ____ contacts that were normally closed closes , opens Making contacts are Normally open contacts Breaking contacts are normally closed contacts What happens to wire connections when you have AC Relay chatter AC relay chatter causes contacts to crystalize and break A better DC power supply system that eliminates the dip to zero current at anytime 3 phase full wave rectifier system A contact on a relay that shorts ou...

What is the best source for determining if a solvent is safe or not? correct answer: SDS A ladder needs to be extended 20 feet from the ground floor to the next landing, how far from the wall should the base of the ladder be? correct answer: 5 feet which procedure would you use to get into a pit to service an elevators oil buffer? correct answer: operate the bottom hoistway access switch When you are installing pit equipment, which two items are required by the ASME A17.1 code? corre...

A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What sheave is required? - Diam=12" 12/4=3" 25fpm=3" 100fpm + 25fpm= 12"+3"= 15" sheave A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read voltage or resistance. What should you do? - Replace it with a larger MOV On a Ward-Leonard circuit the break is set, but the motor is trying to slip through the break. What is the issue? - Suicide Circuit You have an old DC motor ...

Mechanic Review Exam Questions and Answers All Correct Energizing a relay coil ____ contacts that were normally open and ____ contacts that were normally closed - ANSWER closes , opens Making contacts are - ANSWER Normally open contacts Breaking contacts are - ANSWER normally closed contacts What happens to wire connections when you have AC Relay chatter - ANSWER AC relay chatter causes contacts to crystalize and break A better DC pow...

Mechanic Review

Mechanic Review questions and answers 100% verified. Energizing a relay coil ____ contacts that were normally open and ____ contacts that were normally closed - correct s , opens Making contacts are - correct answers.Normally open contacts Breaking contacts are - correct lly closed contacts What happens to wire connections when you have AC Relay chatter - correct answers.AC relay chatter causes contacts to crystalize and break A better DC power supply system th...

What type of elevator control passes up hall calls in the down direction and down hall calls in the up direction? (705) correct answer: Selective collective control Which of the following statements applies to two-speed AC drives? (705) correct answer: VVVF modifications can greatly improve floor accuracy Which type of diagram provides a picture of the appearance and location of elevator parts? (705) correct answer: Field wiring diagram Which of the following symbols represents a fie...

Elevator Mechanic Review Eligibility Course Exam Graded A+ 2023