- Study guides, Class notes & Summaries

SOS Mechanic Certification- HVAC Practice Questions with Correct Answers(latest update) After installing a new battery how long should you wait to allow for pcm time - CORRECT ANSWER-no need to wait As blower motor speed decreases the voltage drop across the resistance block.... - CORRECT ANSWER-increases What should you do first when replacing junction block or fuse? - CORRECT ANSWER-Unlock the battery ground cable The polarity of the voltage applied to the electromagnetic coils of ...

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5 pages

Written in 2024/2025

Grade A+

LmstopAchiever

What are the key components in an EVAP system? - correct answer Fuel Tank, gas cap, lines/hoses, and charcoal canister Catalytic Converter: - correct answer Oxidizes NOx into CO and HC When testing a connector what is an acceptable reading? a.) 1V from ground side b.) 1V from positive/reference side c.) .5V from at each connector d.) 1.5v from sensor harness - correct answer C An oxygen sensor is reading 400mv, what would this indicate - correct answer lean condition What increas...

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22 pages

Written in 2024/2025

Grade A+

Beckham

An Engine Brake (Jacobs Brake) - Correct Answer A. Is A Self-Energizing Servo Type. B. Is Normally Used In Place Of A Spring Brake. C. Restricts The Intake Port And Causes A Build Up Of 30-45 Lbs Of Pressure. D. Opens The Exhaust Valves Near The Top Of The Compression Stroke To Release The Compressed Air. (Correct Awnser) In The System Shown Below, The Part At C Is: - Correct Answer A. An Inversion Valve. (Possible Correct Awnser) B. A Safety Valve. C. A Modulator Valve. (Not Correct Awn...

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13 pages

Written in 2024/2025

Grade A+

Beckham

After installing a new battery how long should you wait to allow for pcm time - correct answer no need to wait As blower motor speed decreases the voltage drop across the resistance block.... - correct answer increases What should you do first when replacing junction block or fuse? - correct answer Unlock the battery ground cable The polarity of the voltage applied to the electromagnetic coils of an actual working DC motor is.... - correct answer a commutator When performing a volt d...

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6 pages

Written in 2024/2025

Grade A+

Beckham

A cracked or torn vacuum diaphragm in a brake power booster would most likely cause: - correct answer a hard pedal feel requiring very high pedal effort to stop to test a vacuum power brake booster in the vehicle, you should pump the brake pedal at least 4 times, hold the brake pedal depressed, and start the engine. the brake pedal should: - correct answer drop slightly and remain firm A mechanic finds gear lube inside both rear drums on a rear wheel drive vehicle. What is most likely the ...

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4 pages

Written in 2024/2025

Grade A+

Beckham