Question

UNIT TEST 1. Which of the following statements is a characteristic of a control transformer? a. b. Permits switching off the load Prevents motor overload c. d. Provides control voltage compatible with relay coils Enables motor phase reversal 2. Which contactor utilization category permits plugging operation? a. AC-1 b. AC-2 с, АС-3 d. AC-4 3. What happens as power returns, in a three-wire motor circuit, following a pow failure? a. The motor restarts automatically b. The motor remains de-energized. c. The motor starts in the opposite direction. d. The overload relay trips 4. What should be taken care of, when servicing a two-wire control circuit? a. There is a risk of seeing the motor start inadvertently b. Three wires must be connected to the pilot device. c. An operator must be present to restart the machine. d. All of the answers above are correct. 5. Push button interlocking is a type of a. Electrical interlocking b. Mechanical interlocking c. Braking method d. Lockout/tagout procedure

Answer 1