If the rheostat were connected in series with the shunt fieldwinding and the combination placed acrossa120 Vdc line,what shunt field current variations could be obtained fromyour motor?IminAdcImax =Adc resistance plus brushes is substantially thesame for every rotational position of the armature. Explain.Thearmature

A self-excited DC shunt motor, also known as a shunt wound DC motor, is a form of self-excited DC…

Answered: the rheostat were connected in series…

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter17: Commercial And Industrial Air-conditioning Control Systems

Section: Chapter Questions

Problem 3RQ

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A 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.
A long-shunt compound generator delivers a load current of 50A at 500V and has armature, series field and shunt field resistances of 0.05 ohms, 0.03 ohms and 250 ohms respectively. Calculate the generated voltage and the armature current. Allow 1V per brush for contact drop.
Two shunt generators are operating in parallel and taking equal shares of a 2400 A, 230 V bus load. The ratings of the generator are as follows: Generator 1: %VR is 3%, rated power is 500 kW, rated voltage 250 V. Generator 2: %VRis 4%, rated power 600 kW and rated voltage 250 V. If an additional 600 A load is connected to the bus, determine the current delivered by each generator at this condition
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 loss
Given a 25 hp, three-phase, 230-volt, squirrel cage induction motor. The ambient temperature of the place ofinstallation is 40°C. Use TW wires
If the armature resistance of a 3-phase, 318.75 kVA, 2300-V synchronous generator is 0.35 ohms per phase, the synchronous reactance is It is 1.2 ohms. Calculate the excitation voltage and voltage regulation for the following load cases: a) Full load, back power factor of 0.8 and rated voltage. b) Full load, forward power factor of 0.6 and rated voltage.
A 460VAC rated, 60 Hz, 125-Hp Three-phase Synchronous type motor is to be connected for across-the-line starting. Determine its conductor size if the ambient temp and ZW copper will be used.
Referring to Figure 4.5, determine the operating time for a relay with a 10 A pickup, time dial settingof 1.0, and 25.0 A operating current. Explain the procedure to calculate the narrated parameters if theactual operating time may not correspond exactly to the time dial setting at any given multiple ofpickup as given on the manufacturer’s curve.
Draw DC. Shunt generator which gives a full load output (30 K Watt) at the main voltage source of 200 voltage. In addition, gives the armature and shunt field resistors (0.05Ω and 50Ω), having 1000 watt iron and fractional losses. Calculate the Electro Magnetic field (EMF), Efficiency and Copper Loss. Please Answer with good line I mean not with words I can't understand.
A 460VAC rated, 60 Hz, 125-Hp Three-phase induction type motor is to be connected for across-the-line starting. The nameplate indicates the motor’s maximum ampere rating, 160A. It has a NEMA code letter B. The ambient temp of the installation place is and TW copper will be used. Short-circuit protection device that will be used is Inverse Time Breaker. Calculate the Conductor size.
The synchronous reactance of a generator is 1.0 per unit, and the leakage reactance of itsarmature is 0.1 per unit. The voltage to neutral of phase a at the bus of a large system to which the generator is connected is 1.0∠0 ◦ per unit, and the generator is delivering a current Ia = 1.0∠− 30◦ per unit. Neglect resistance of the winding and find:a. the voltage drop in the machine due to armature reactionb. the internal voltage to neutral E of phase a of the generatorc. the per unit values of P and Q delivered to the bus Note: Equivalent circuit is shown in Fig. 1 where Xar armature reactance, Xl leakagereactance, and XS synchronous reactance
Referring to Figure 364, why is it not possible to remove all of the resistance from the secondary circuit? Fig. 364 Automatic acceleration of wound rotor motor using a simplified frequency relay system.

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the rheostat were connected in series with the shunt f winding and the combination placed across a l20 Vdc 1 what shunt field current variations could be obtained your motor? Imin Adc