# 1ปรนัย1. Which of the following is NOT a permanent joint?A. Welded jointB. Riveted jointC. Bolted jointD. Soldered joint
# 2ปรนัย2. The factor of safety is defined as:A. Working stress / Ultimate stressB. Ultimate stress / Working stressC. Yield stress / Working stressD. Allowable stress / Ultimate stress
# 3ปรนัยIn a screw thread, the distance between corresponding points on adjacent threads is called:A. LeadB. PitchC. FlankD. Crest
# 4ปรนัย4. For maximum efficiency in power transmission, the angle of lap in a belt drive should be:A. Less than 90°B. Exactly 90°C. As small as possibleD. As large as possible