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 an actual working DC motor is.... -
CORRECT ANSWER-a commutator
When performing a volt drop test the volt meter setting should be set to the following.. - CORRECT
ANSWER-3 volts
The symbol at the RIGHT represents..... - CORRECT ANSWER-a relay
Which device is used to monitor throttle position on the computer - CORRECT ANSWER-potentiometer
A reading of .8 volts on the volt meter #2 would indicate..... - CORRECT ANSWER-excessive resistance
In a conventional wiring diagram a dot at the enter section - CORRECT ANSWER-Splice
After replacement of a defective blower motor the teen found motor spins but no air? - CORRECT
ANSWER-reversed polarity to the motor
Which piece of test equipment must be connected parallel - CORRECT ANSWER-Volt meter
, A vehicles blower motor only works on high..... - CORRECT ANSWER-blower resistor
The component D in the following - CORRECT ANSWER-lamp
Which one of the following component can be damaged by electrical discharge - CORRECT ANSWER-all
of the above
An am-meter should be connected in which of the following - CORRECT ANSWER-In series with the load
Direct transmitter controlled switches of a component - CORRECT ANSWER-less current, high frequency
The following symbol at the right - CORRECT ANSWER-Diode ->}-
A technician finds a horn relay that is stuck closed - CORRECT ANSWER-the horn is constantly blowing
A fusable link can be tested with... - CORRECT ANSWER-all of the above
In the circuit below the left front + left rear turn signals - CORRECT ANSWER-excessive resistance at point
b
When testing a remote mounted starter relay - CORRECT ANSWER-When testing a remote mounted
starter relay
An ohm meter - CORRECT ANSWER-can be connected without regard to polarity, unless electrical
contains a diode
Charging system positive side voltage drop not exceed - CORRECT ANSWER-.7 volts
What type of meter should you use to diagnose on board micron computer - CORRECT ANSWER-a high
independence digital diagnostic instrument
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 an actual working DC motor is.... -
CORRECT ANSWER-a commutator
When performing a volt drop test the volt meter setting should be set to the following.. - CORRECT
ANSWER-3 volts
The symbol at the RIGHT represents..... - CORRECT ANSWER-a relay
Which device is used to monitor throttle position on the computer - CORRECT ANSWER-potentiometer
A reading of .8 volts on the volt meter #2 would indicate..... - CORRECT ANSWER-excessive resistance
In a conventional wiring diagram a dot at the enter section - CORRECT ANSWER-Splice
After replacement of a defective blower motor the teen found motor spins but no air? - CORRECT
ANSWER-reversed polarity to the motor
Which piece of test equipment must be connected parallel - CORRECT ANSWER-Volt meter
, A vehicles blower motor only works on high..... - CORRECT ANSWER-blower resistor
The component D in the following - CORRECT ANSWER-lamp
Which one of the following component can be damaged by electrical discharge - CORRECT ANSWER-all
of the above
An am-meter should be connected in which of the following - CORRECT ANSWER-In series with the load
Direct transmitter controlled switches of a component - CORRECT ANSWER-less current, high frequency
The following symbol at the right - CORRECT ANSWER-Diode ->}-
A technician finds a horn relay that is stuck closed - CORRECT ANSWER-the horn is constantly blowing
A fusable link can be tested with... - CORRECT ANSWER-all of the above
In the circuit below the left front + left rear turn signals - CORRECT ANSWER-excessive resistance at point
b
When testing a remote mounted starter relay - CORRECT ANSWER-When testing a remote mounted
starter relay
An ohm meter - CORRECT ANSWER-can be connected without regard to polarity, unless electrical
contains a diode
Charging system positive side voltage drop not exceed - CORRECT ANSWER-.7 volts
What type of meter should you use to diagnose on board micron computer - CORRECT ANSWER-a high
independence digital diagnostic instrument
