Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 50, Problem 11SQ
To determine
Design a shunt field circuit with an automatic rheostat control.
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Technician A says when testing the voltage output, if the charging voltage is too high, the cause could be an open field wire from the regulator. Technician B says a loose or glazed drive belt could be the cause of too high charging voltage. Who is correct?
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Technician A says that poor connection at the generator output wire can cause charging systems problems. Technician B says that many charging system circuits contain a circuit protection device. Who is correct?
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At standstill condition, the back emf is zero, so the motor can be safely turned ON without a starter. Select one: OTrue O False
Chapter 50 Solutions
Electric Motor Control
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- Which of the following applies to an autotransformer starter with a five-pole starting contactor: open transition or closed transition? Locate in Figure 273.arrow_forwardRefer to the first Practical Application in this set. When the 50-HP motor replaces the 30-HP motor, the overload heaters will have to be changed. Using the chart in Figure 34-8, what size overload heaters should be used to protect the 50-HP motor?arrow_forwardRefer to the circuit shown in Figure 105. If the pressure should become high enough for the pressure switch to close and stop the motor, is it possible to restart the motor before the pressure drops to a safe level?arrow_forward
- Select the best answer for each of the following. The purpose of overload protection on a motor is to protect the a. motor from sustained overcurrents. b. wire from high currents. c. motor from sustained overvoltage. d. motor from short circuits.arrow_forwardA 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?arrow_forwardDetermine the minimum current for conductors required to connect a motor that has a full-load current of 46 A.arrow_forward
- Completely solve and box/highlight/bold the final answers. WRITE LEGIBLY OR TYPEWRITE THE SOLUTIONS. A 60 kW, 230 volts shunt generator has an equivalent armature resistance of 0.3 ohms, and shunt field resistance of 60 ohms. Calculate: a. armature current and induce voltage b. generated power and total power lossarrow_forwardQ.35 When overload contacts are connected into a control circuit, are they connected in series with the starter coil or in parallel with the starter coil? Select one: A. PARALLEL B. SERIESarrow_forward1.(Im) does the excitation circuit current change as motor current changes? explain the reasons.arrow_forward
- Refer to the circuit shown in Figure 105. Assume that the motor is running and an overload occurs, which causes the OL contact to open and disconnect coil M to stop the motor. What effect does the opening of the overload contact have on the pressure switch circuit?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_forwardpole-zero(control systems)arrow_forward
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