Question 281Electricity/Electronics - Assistant Engineer70% to pass
Which of the following contactors or relays has a timing function for the transition from start to run? Illustration EL-0080
AI Explanation
The correct answer is A) KA1.
The KA1 contactor or relay has a timing function for the transition from start to run. This is because the KA1 contactor is typically used to control the starting and running circuits of an electric motor. The timing function allows for a smooth transition from the starting windings to the running windings, preventing damage to the motor.
The other options, KM1, KM2, and KM3, are general-purpose contactors or relays that do not have a specific timing function for the start-to-run transition. They may be used in various motor control applications, but they do not have the specialized timing feature that the KA1 contactor provides.
Related Questions
#279 In the illustrated solid-state "soft" starter for a three phase induction motor as shown in figure "A", what is the name of the devices that are controlled by the gate control circuits? Illustration EL-0060 #280 Which of the following pictures represents a magnetic reversing or two-speed motor starter? Illustration EL-0179 #282 As shown in the illustration, what type of motor and motor starter are featured? Illustration EL-0136 #283 As shown in the illustrated feeder disconnect controller, what statement is true? Illustration EL-0138 #284 Autotransformer starters, sometimes called starting compensators, are sometimes used with larger polyphase induction motors. What function do they perform?