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Motors and Controls Flashcards

7 cards from real Ramsay Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Motors and Controls flashcards as text

  1. What does the abbreviation 'FLA' mean on an electric motor nameplate?

    Answer: Full Load Amperes

    FLA stands for Full Load Amperes, indicating the current the motor draws when operating at rated voltage and rated horsepower output.

  2. What is the synchronous speed of a 4-pole AC induction motor connected to a 60 Hz power supply?

    Answer: 1800 RPM

    Synchronous speed = (120 × frequency) / number of poles = (120 × 60) / 4 = 1800 RPM.

  3. A squirrel cage induction motor gets its name from the design of which component?

    Answer: The rotor, which uses aluminum or copper bars short-circuited at both ends

    The rotor of a squirrel cage motor consists of conductive bars (aluminum or copper) embedded in laminations and short-circuited at each end by end rings, resembling a squirrel cage.

  4. What is the primary purpose of the overload relay in a motor starter?

    Answer: To protect the motor from damage caused by sustained overcurrent

    Overload relays detect excessive current sustained over time and trip the starter to prevent motor winding damage from heat buildup.

  5. A three-phase motor that was running normally suddenly begins running at reduced speed under full load. What is the most likely cause?

    Answer: One phase of the three-phase supply has been lost (single-phasing)

    Loss of one phase (single-phasing) causes the motor to run on single-phase power, drastically reducing torque and speed while dramatically increasing current draw.

  6. On a dual-voltage motor, the high-voltage connection wires the stator coils in which configuration?

    Answer: Series, providing higher impedance and lower current draw

    For high-voltage operation, the dual-voltage motor's winding groups are connected in series, which doubles the impedance and halves the current compared to the low-voltage (parallel) connection.

  7. What does a motor's 'service factor' (SF) indicate on the nameplate?

    Answer: A multiplier showing how much above rated load the motor can carry intermittently without damage

    A service factor of 1.15 means the motor can safely handle 115% of its rated horsepower for short periods, provided voltage, frequency, and temperature are within limits.