Electrical Quiz #1

Good luck with this RSES Twin Cities quiz...
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1) Serviceman A says small hermetic compressors up through 1/3 HP can be of the split phase type. Serviceman B says these compressors must have some type of start relay. Who is correct?
2) Serviceman A says the start relay of a hermetic compressor stays in the starting circuit as long as the compressor is running. Serviceman B says no start relay is necessary with a split phase compressor. Who is correct?
3) Serviceman A says the function of a start relay in a hermetic compressor is to disconnect the start winding as the motor comes up to design speed. Serviceman B says a single phase hermetic compressor doesn't need a start winding. Who is correct?
4) Serviceman A says a start capacitor stays in the circuit of hermetic compressor as long as the compressor is running. Serviceman B says the start capacitor is used to produce a higher starting torque. Who is correct?
5) Serviceman A says a wired in Positive Temperature Coefficient (PTC) relay can be used to start a capicitor start-induction run compressor. Serviceman B says a potential relay can be used to start a capacitor start-induction run hermetic compressor. Who is correct?
6) Serviceman A says the contacts of a current starting relay are closed as the hermetic compressor starts. Serviceman B says the contacts of the potential relay are open as the hermetic compressor starts. Who is correct?
7) Serviceman A says a 5 HP single phase hermetic compressor has both a start and run capacitor. Serviceman B says a 5 HP three phase compressor has a start and run capacitor. Who is correct?
8) Serviceman A says the run capacitor of a 5 HP single phase hermetic compressor is wired in parallel with the start windings. Serviceman B says the run capacitor of any hermetic single phase compressor is wired in series with run windings. Who is correct?
9) Serviceman A says a 5 HP single phase hermetic compressor can be equipped with either an external thermal protector or an internal thermal protector. Serviceman B says a 5 HP single phase hermetic compressor comes equipped with only an internal thermal protector. Who is correct?
10) Serviceman A says an external thermal hermetic protector must be firmly attached to the compressor housing. Serviceman B says the external thermal protector senses any unusual temperature rise or excessive current draw. Who is correct?


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