When you read measurements on an analog multimeter, you must look straight at the meter scales in order to prevent?

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.

Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?