720 Logic Controls Exam questions and answers Graded A+

720 Logic Controls Exam questions and answers Graded A+ Refer to figure 1. If the car were running up in response to a third floor call, when would the U relay de-energize? When the 3C-3 contact opens Refer to figure 1. What is the purpose of contact M-1? Non-interference Refer to figure 2. What actuates the P.M. switch? Vane or fin How must a latching relay be reset? Energize the reset coil If the synchronous selector ratio were 40 to 1, and the car moved 20 feet, how far will the selector have moved? 6 inches Synchronous selectors may be driven by which of the following methods? Aircraft cable Refer to figure 3. What contacts are used to set the 2PL relay? ND 8-5, AL 8/2, 2P 9-6 Refer to figure 3. What will be the condition of the latching or PL relays when the car is at the top floor? All set Refer to figure 3. What happens to the alternate latching relays when the elevator travels up from the first floor to the second?