Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 33, Problem 10RQ
If a dual-voltage split-phase motor is to be operated on high voltage, how are the run windings connected in relation to each other?
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Chapter 33 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 33 - What are the three basic types of split-phase...Ch. 33 - The voltages of a two-phase system are how many...Ch. 33 - How are the start and run windings of a...Ch. 33 - In order to produce maximum starting torque in a...Ch. 33 - What is the advantage of the capacitor-start...Ch. 33 - On average, how many degrees out of phase with...Ch. 33 - What device is used to disconnect the start...Ch. 33 - Why does a split-phase motor continue to operate...Ch. 33 - How can the direction of rotation of a split-phase...Ch. 33 - If a dual-voltage split-phase motor is to be...
Ch. 33 - When determining the direction of rotation for a...Ch. 33 - What type of split-phase motor does not generally...Ch. 33 - What type of single-phase motor develops the...Ch. 33 - Prob. 14RQCh. 33 - Prob. 15RQCh. 33 - When a repulsion-start induction-run motor reaches...Ch. 33 - Prob. 17RQCh. 33 - What causes the magnetic field to rotate in a...Ch. 33 - How can the direction of rotation of a shaded-pole...Ch. 33 - Prob. 20RQCh. 33 - Prob. 21RQCh. 33 - Prob. 22RQCh. 33 - Prob. 23RQCh. 33 - Prob. 24RQCh. 33 - What is the principle of operation of a stepping...Ch. 33 - What does the term bifilar mean?Ch. 33 - Prob. 27RQCh. 33 - When a stepping motor is connected to AC power,...Ch. 33 - What is the synchronous speed of an eight-pole...Ch. 33 - How can the holding torque of a stepping motor be...Ch. 33 - Why is the AC series motor often referred to as a...Ch. 33 - Prob. 32RQCh. 33 - How is the direction of rotation of the universal...Ch. 33 - Prob. 34RQCh. 33 - Prob. 35RQCh. 33 - Prob. 36RQCh. 33 - Prob. 1PA
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- What type of split-phase motor does not generally contain a centrifugal switch?arrow_forwardWhy are different motor connections shown for what appears to be the same motor in the various diagrams in Figure 332? FIG. 332 Typical arrangements for four-speed, three-phase, two-winding motors.arrow_forwardWhat are the procedure in rewinding a three-phase motor?arrow_forward
- In the case of star-delta connection of a three-phase asynchronous motor with a power of 100 hp working with a voltage of 460 Volts, the voltmeter connected to measure the winding resistance measures 24 volts dc and the ammeter measures 80 amperes. Calculate the stator single phase winding resistance? a) 0.45 ohms b) 0.46 ohms c) 0.47 ohms d) 0.48 ohmsarrow_forwardIf a single - phase induction motor is disconnected from 220 V, 50 Hz AC power supply, and the stator windings are energized with DC power. In this case, will the motor speed up, reverse and turn in the opposite direction or come to a stop, quickly? ...arrow_forwardA 3-phase, slip-ring, induction motor with star-connected rotor has an induced e.m.f. of 120 volts between slip-rings at standstill with normal voltage applied to the stator. The rotor winding has a resistance per phase of 0.3 ohm and standstill leakage reactance per phase of 1.5 ohm. Calculate the rotor current/phase when running short-circuited with 4 percentslip.arrow_forward
- Explain briefly in one (1) sentence why a big industrial motor cannot be operated under single-phase power supply?arrow_forwardWhy does a split- phase motor continue to operate after the start windings have been disconnected from the circuit?arrow_forwardReconnecting induction motor 1.a. Which one of the following pitches is the minimum recommended pitch for a 24-pole motor with 360slots?A. 15 slotsB. 8 slotsC. 10 slotsD. 12 slots 1.b. The reconnection that can be made for a three-phase 10-pole 230-volt motor connected in 2-parallelA. 4-parallel Y.B. 5-parallel △C. 3-parallel Y.D. 4-parallel △arrow_forward
- The internal resistance of a phase winding of a squirrel cage asynchronous motor with 440 V, λ (star) connected, 50 Hz, 8 poles was measured Rs = 0.1 Ω, and the phase-to-phase voltage of this motor was 440 V, while there is no load torque on it in the idle running test (shaft). current 12.6 A, and the total power drawn was measured as 1891 W (3 phases). With the rotor locked, the phase-to-phase voltage was measured as 140 V, phase current 80 A and total power drawn 3796 W (3 phases). In this case; Calculate the equivalent circuit parameters of the squirrel-cage induction motor.arrow_forwardThe power input to a 3-phase, 50 Hz, 400 V, the 4-pole induction motor is 60 kW and its stator losses are 1 kW. If this motor is running at 4% slip, then what is the rotor copper loss?arrow_forward- Reconnecting Induction Motors 6.a. The voltage in a 460-volt motor is changed to 425 volts. If the original torque was 125 lb-ft, the newtorque isA. 135 lb-ft.B. 117 lb-ft.C. 115 lb-ft.D. 107 lb-ft.6.b. If a 575-volt three-phase motor originally connected in 3-parallel △ is reconnected in 5-parallel Y, thenew voltage isA. 501 volts.B. 794 volts.C. 598 volts.D. 747 volts.arrow_forward
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