Current & voltage in electromagnetic relays - Hydraulics & Pneumatics

Q.  Which of the following statements is true?
- Published on 14 Aug 15

a. electromagnetic relays have high reliability at more cost
b. electromagnetic relays use low current and voltage, to have open or close contact in high voltage and current circuit
c. air pressure passed to pressure electric converter opens a contact which energizes a circuit for the flow of electric contact
d. all of the above

ANSWER: electromagnetic relays use low current and voltage, to have open or close contact in high voltage and current circuit

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