14 _______________________________________ IN ANSWERING QUESTIONS 2-52 THROUGH 2-54, SELECT FROM COLUMN B THE TRIP ELEMENT THAT IS DESCRIBED BY THE ACTION LISTED IN COLUMN A.  NOT ALL ITEMS IN COLUMN B WILL BE USED. A.  ACTIONS B.  TRIP ELEMENTS 2-52.     An electromagnet is connected in series with the load 1. Thermal 2-53.     A bimetallic strip is heated by the load current 2. Magnetic 2-54.     A bimetallic strip is heated by the load current and electromagnet is connected in series with the load 3. Mechanical 4. Thermal-magnetic _______________________________________ 2-55.   A circuit breaker that will trip even if the operating mechanism is held ON is known as what type of circuit breaker? 1.    Standard 2.    Emergency 3.    Trip free 4.    Nontrip free 2-56.   What type of circuit breaker can be overridden if the operating mechanism is held ON? 1.    Standard 2.    Emergency 3.    Trip free 4.    Nontrip free 2-57.   Which of the following is NOT a time- delay rating for a circuit breaker? 1.    Long 2.    Short 3.    Standard 4.    Instantaneous 2-58.   Selective tripping is used to cause which of the following circuit breakers to trip when there is an overload? 1.    The least expensive 2.    The most accessible 3.    The smallest current rating 4.    The closest to the fault 2-59.   Selective tripping is used to accomplish which of the following purposes? 1.    To reduce wear and tear on circuit breakers 2.    To isolate a faulty circuit without affecting other circuits 3.    To simplify the task of resetting the circuit breaker 4.    To enable the application of power to emergency circuits during an overload THIS SPACE LEFT BLANK INTENTIONALLY.