EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Textbook Question
Chapter 28, Problem 3SQ
If the nameplate of a dual-voltage motor connected to a part winding starter reads 15/30 amperes, which amperage value is used as the basis for the selection of the overload heating elements?
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Students have asked these similar questions
A selector switch Andrés two- aire piloto debiese cannot be used to comtrol a larger motor directly but rather must be connected to the magnetic starter. Why this is true?
b) Determine the contactor and overload rating for DOL starter of the 93 kW three-
phase squirrel cage motor with specification as per below:
415 volts, 50HZ, 1450rpm, 90% efficiency, 0.85 power factor, KVA code H
(KVA/HP = 6.7)
c) A relay is an electromagnetic switch that is used to turn on and turn off a circuit by
a low power signal, or where several circuits must be controlled by one signal. With
aid of illustration, describe the THREE (3) methods to verify the performance of a
relay in an electrical circuit.
A direct current motor is connected to a 250-volt DC supply. The armature has a current draw of 165 amperes when operating at full load. You have been assigned the task of connecting two resistors in the armature circuit to provide speed control for the motor. When both resistors are connected in the circuit, the armature current is to be limited to 50% of the full-load current draw. When only one resistor is connected in the circuit, the armature current is to be limited to 85% of full-load current. Determine the ohmic value and min-imum power rating of each resistor.
Chapter 28 Solutions
EBK ELECTRIC MOTOR CONTROL
Ch. 28 - Prob. 1SQCh. 28 - Which voltage may be applied to a 230/460-volt...Ch. 28 - If the nameplate of a dual-voltage motor connected...Ch. 28 - If a timing relay fails to cut in the run starter,...Ch. 28 - Prob. 5SQCh. 28 - Prob. 6SQCh. 28 - Who determines the compliance of an installation...Ch. 28 - Prob. 8SQCh. 28 - Refer to the circuit shown in Figure 284. When the...Ch. 28 - Refer to the circuit shown in Figure 283. It is...
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- 5. Which part (s) of the DC motor connect the power supply to the split- ring and coil? * O a) Carbon brushes O b) Magnets O c) Commutator d) Slip ringsarrow_forwardA squirrel-cage induction motor has a nameplate full-load current of 78 amperes and a marked temperature rise of 30C. The motor requires a NEMA size 4 starter. Using the overload heater chart in Figure 34-8, what size overload heaters should be used to protect this motor?arrow_forwardA belt-driven 202 Hp shunt wound DC generator is running at 465 rpm and issupplying full load to a bus bar at 232 V. At what speed will it run if the belt breaksand the machine continue to run taking 9 kW from the bus bar? The armature andthe field resistances are 0.05 Ohm and 100 Ohms respectively. The brush contactdrop is 2 Volts per brush.arrow_forward
- Determine the contactor and overload rating for DOL starter of the 99 kW three- phase squirrel cage motor with specification as per below: 415 volts, 50HZ, 1450rpm, 90% efficiency, 0.85 power factor, KVA code H (KVA/HP = 6.7) A relay is an electromagnetic switch that is used to turn on and turn off a circuit by a low power signal, or where several circuits must be controlled by one signal. With aid of illustration, describe the THREE (3) methods to verify the performance of a relay in an electrical circuit. I D Focus O N Warrow_forwardAt standstill condition, the back emf is zero, so the motor can be safely turned ON without a starter. Select one: OTrue O Falsearrow_forward10 kW, 400 volt 3 phase star connected synchronous motor has negligible armature resistance the synchronous reactance per phages 10 ohms. Determine the minimum current that the motor will draw if the excitation is varied. The full load efficiency of motor is 80% 10 minute fast please answerarrow_forward
- Question 11 Design a Duplex layer simplex lap winding DC machine armature winding by providing a complete wiring diagram with the following Number of Poles: 2 Number of Slots; 8 Thank you and Godbless ASAP pleaseearrow_forwardExplain how does the current will be reduced during the starting of the motor.arrow_forwardExplain the characteristics and how the following motor starters work. 1.Slip Ring a. Variable Resistance b. Fixed Starting Resistancearrow_forward
- Draw a Start – Stop Full Voltage 3-phase AC Motor Starter circuit. The power circuit should be 220 V and the control circuit is 220V. Assume that the working voltage of the magnetic contactor is 220 V.arrow_forwardA 120 volts shunt motor has an armature resistance of 0.08 ohm and filed resistance of 60 ohms. What current is drawn when its back emf is 114.8 volts?arrow_forwardIf a overload heater element is not installed in a two pole manual starter then what would happen?arrow_forward
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