Question 75Refrigeration & AC - 1st Asst/Chief
70% to passExcessively tight drive belts installed between a motor and a refrigeration compressor pulley may cause what condition?
Apremature wear of both the pulley end motor shaft bearing and the pulley end compressor crankshaft main bearing due to overloading
Bpremature wear of both motor shaft bearings and both compressor crankshaft main bearings due to belt slippage
Cpremature wear of the pulley end motor shaft bearing, but normal wear of the pulley end compressor crankshaft main bearing
Dnormal wear of the pulley end motor shaft bearing, but premature wear of the pulley end compressor crankshaft main bearing
AI Explanation
The correct answer is A) premature wear of both the pulley end motor shaft bearing and the pulley end compressor crankshaft main bearing due to overloading. Explanation: Excessively tight drive belts installed between a motor and a refrigeration compressor pulley will create excessive tension and load on the motor shaft bearing and the compressor crankshaft main bearing. This overloading can lead to premature wear and failure of both the motor shaft bearing and the compressor crankshaft main bearing. The other answer choices are incorrect because: B) Belt slippage would not occur with excessively tight belts. C) and D) Only one bearing would not experience premature wear.
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