22 3-55.   If a relay is hermetically sealed with an opaque cover, which of the following methods should be used to determine whether the relay is operating? 1.    Shake the relay and listen for loose parts 2.    Place your finger on the cover and feel the relay contact movement 3.    Remove the cover and visually observe the relay contacts when the relay is activated 4.    Activate the relay and observe whether a metal object is attracted by the magnetic field 3-56.   If a relay is NOT operating properly, which of the following items need NOT be checked? 1.    The armature resistance 2.    The terminal leads 3.    The contact surfaces 4.    The contact spacing 3-57.   What should be used to clean the contacts of a relay? 1.    Sandpaper 2.    Emery cloth 3.    A jeweler's file 4.    A burnishing tool 3-58.   What should be used to adjust contact clearances on a relay? 1.    A point bender 2.    A burnishing tool 3.    A pair of pliers 4.    A pair of hemostats