Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 24, Problem 3SQ
Under what condition will the motor restart automatically after a voltage failure?
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A starter turns very slowly and has excessive cranking current draw. When removed from the vehicle and bench tested, the starter spins normally and current draw is within specifications. Technician A says poor battery connections may be the cause. Technician B says an internal engine problem may be the cause. Who is correct?
At standstill condition, the back emf is zero, so the motor can be safely turned ON without a starter. Select one: OTrue O False
An electrician inspects an electric motor that doesn't run properly. What is wrong with this motor?
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- If a mechanical interlock is the only means of interlocking used, what procedure must be followed to reverse the direction of the motor? Assume the motor to be running forward.arrow_forwardAt standstill condition, the back emf is zero, so the motor can be safely turned ON without a starter. Select one: O True O False?arrow_forwardSelect the best answer for each of the following. If an operator pushes a start button on a three-phase induction motor and the motor starts to hum, but not run, the probable trouble is a. one fuse is blown and the motor is single phasing. b. the overload trip needs resetting. c. the auxiliary contact is shorted. d. one phase is grounded.arrow_forward
- Select the best answer for each of the following. When the reset button does not reestablish the control circuit after an overload, the probable cause is a. the overload heater is too small. b. the overload trip has not cooled sufficiently. c. the auxiliary contacts are defective. d. the overload heater is burned out.arrow_forwardDoes the Indoor Fan Motor stop when the LPC faulty?arrow_forwardIf a motor starter is installed according to directions but will not start, what is a common cause for the failure to start?arrow_forward
- Does the Indoor Fan Motor stop when the control fuses faulty?arrow_forwardA single-phase electric motor is connected to a 240-volt, 30-ampere circuit. The motor nameplate indicates that the full-load current draw of the motor is 21 amperes. The motor is connected to an inertia load (a large flywheel) that requires several seconds for the motor to accelerate to full speed. Because of the long starting time, the motor causes the circuit breaker to trip before the load has reached full speed. Your job is to connect a resistor in series with the motor during the starting period that will limit the starting current to 90% of the circuit-breaker rating. An ammeter indicates that the motor has a current draw of 64 amperes when power is first applied to the motor. Determine the ohmic value and wattage rating of the resistor that should be connected in series with the motor during the starting period.arrow_forwardWhat is the purpose of a starting relay? to start an electric motor to remove the starting winding or component from the circuit to protect the motor from starting overloads to prevent the motor from starting under heavy loadsarrow_forward
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