Please help me quickly i need to answer this question quickly

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

Most leaks in reciprocating air compressors can be detected and minimized by: (clo4) a)-detecting leakage areas using ultrasonic acoustic detector. b)-tightening joints and connections c)-replacing faulty equipment d)-all of the given options

The proportional limit is always greater than the yield strength for a material. a)-trune b)- false