Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 37, Problem 4SQ
To determine
Choose the correct option that would not cause the following problem: when the tank is overflowing, the wound rotor motor has not started and the alarm has not sounded.
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8.a. Which of the following most accurately describes the difference between a contactor and a starter?A. A starter contains a contactor and some additional protective circuitry.B. A starter is always mounted in an enclosure.C. A starter contains reversing contacts.D. A starter is always three-phase while a contactor may be single-phase or three-phase.8.b. The main bus in a motor control center is used toA. reduce the possibility of overload with large loads.B. enclose motors within a protective shield.C. distribute power to all starters in the center.D. reduce the voltage of the plant's supply.
Type your question here /The armature of a 6600 volt, three-phase, 20-pole, 300 rpm star-connected
alternator has 180 slots. The flux per pole is 80 m Wb and the coil span is 160°
electrical. Determine the number of conductors in series per phase.
2.A DC series generator is supplying a current of 8 A to a series lighting system through a feeder of total resistance of 2 Ω. The terminal voltage is 2500 V. The armature and series field resistances are respectively 20 and 10 Ω, respectively. A 15-Ω diverter resistance is shunted across the series field. Determine the power developed in the armature of the generator.
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- 12.a. An electrical device would also fall into the classification of an electric(al)A. motor.B. load.C. component.D. fitting.12.b. A short circuit describes the condition where there's contact between theA. hot wire and the neutral wire.B. grounded conductor and the grounding wire.C. hot wire and the grounding wire.D. neutral wire and the grounded conductor.arrow_forward12. The regulation of a 250-volt shunt generator is 6 per cent. Calculate the no-load voltage.arrow_forwardLook at the photo and answer the following questions it Is a 6 pole, non-salient pole design, 3 phase ac generator, 10 volts induced in each coil. 1. What is the total voltage induced in each of the three phase belts? 2. What is the line voltage between L1&L2? 3. What is the line voltage between L2&L3? 4. What is the line voltage between L1&L3?arrow_forward
- A 100-HP three-phase squirrel-cage induction motor is connected to 480 volts. The conductors supplying the motor are copper with THW2 insulation. The nameplate lists a full-load running current of 118 amperes, NEMA Code B, and a service factor of 1.00. Current transformers with a ratio of 200:5 are used to reduce the current supplied to the overload heaters. The motor is protected with dual-element time delay fuses. Determine the conductor size, overload heater size using the chart in Figure 34-7, NEMA and IEC starter sizes, and fuse size for this motor.arrow_forwardA 350-HP squirrel-cage induction motor is connected to a 480-volts three-phase feeder. The nameplate lists the following: HP 350, Service factor 1.10, Full-load amps 408, NEMA Code B. The conductors are to be copper with THWN insulation, and 600:5 current transformers are used to reduce the current supplied to the overload heaters. The motor circuit is protected with dual-element time delay fuses. Determine the conductor size, overload heater size using the chart shown in Figure 34-7, the NEMA and IEC starter sizes, and the fuse size for this installation.arrow_forwardYou are working as a plant electrician. It is your job to install a 300-hp three-phase squirrel-cage induction motor. The supply voltage is 480 V. The power company has determined that the maximum amount of starting current that can be permitted by any motor in the plant is 3000 A. The motor nameplate is as follows: Phase: 3 FLA: 352 Volts: 480 RPM: 1755 Frame: XXX Code: L Will it be possible to start this motor across the line, or will it be necessary to use a reduced-voltage starter to reduce starting current?arrow_forward
- Calculate the per cent voltage regulation of a 4 KW, 229 -volt shunt generator which has a no-load voltage is 238.9 Volts.arrow_forwardQuestion No. 12: a.) Explain the Gas turbine power plant with neat sketch. b.) Draw and explain the layout of Diesel power plant.arrow_forwardPart 2: Analysis and selection of the Wind Turbine.The team decides at install a 30 MW wind farm. The turbine that has been selected by the local contractor is an Enercon wind turbine. The specifications of all the available Enercon wind turbine is shown in the attached datasheet. 1. What are the two closed loop control systems that are used generally in wind turbines? How do they work? 2. Calculate the power density of the input power from the wind when the wind is blowing at the rated wind speed at the turbine height. Clearly show your steps in details.arrow_forward
- Three squirrel-cage motors are connected to a 480-volt three-phase feeder. The nameplates list the following: Motor 1: HP 10, SF 1.25, Full-load amps 13.1, NEMA Code B Motor 2: HP 25, SF 1.10, Full-load amps 32.8, NEMA Code B Motor 3: HP 15, SF 1.00, Full-load amps 19.6, NEMA Code B The main feeder conductors and conductors to each motor are to be copper, with THWN insulation. The main feeder and each of the motors are protected by dual-element time delay fuses. Determine the conductor size for each motor and the conductor size for the feeder supplying all motors, the overload heater size of each motor using the chart in Figure 34-8, the NEMA and IEC starter sizes for each motor, the fuse size to protect the circuit for each motor, and the fuse size to protect the main feeder.arrow_forwardDetermine the minimum current for conductors required to connect a motor that has a full-load current of 46 A.arrow_forwardDraw the power circuit and control circuit of a Direct On Line Motor Starter fo a three-phase motor. Add 4 pilot lights (PL) in the control circuit; red PL for running forward, orange PL for running in reverse, green for not running and yellow for overload.1. List the components used. 2. Procedures.arrow_forward
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