Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 2.3, Problem 20RQ
To determine
To explain:
The process, to reverse the direction of a three-phase motor.
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If the power measured per phase is increasing, what will happen to the speed of the three phase induction motor?
a.
Decrease
b.
Equal
c.
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how does the rotor of a 3-phase induction motor get power
a- through brushes and commutador segments
b- through brushes and slip ring
c- indution from the stator
d- none of the above
A 115 V,60 Hz, 4 pole 1-phase induction motor rotating in clockwise direction with 1710 rpm. What will be the slip of the motor in a direction opposite to the direction of rotation.
Chapter 2 Solutions
Electric Motors and Control Systems
Ch. 2.1 - Define the term motorcontrol circuit.Ch. 2.1 - Why are symbols used to represent components...Ch. 2.1 - An electrical circuit contains three pilot lights....Ch. 2.1 - Describe the basic structure of an electrical...Ch. 2.1 - Prob. 5RQCh. 2.1 - The contacts of a pushbutton switch open when...Ch. 2.1 - A relay coil labeled TR contains three...Ch. 2.1 - A rung on a ladder diagram requires that two...Ch. 2.1 - Prob. 9RQCh. 2.1 - The wire identification labels on several wires of...
Ch. 2.1 - A broken line representing a mechanical functionon...Ch. 2.2 - What is the main purpose of a wiring diagram?Ch. 2.2 - In addition to numbers, what other method can...Ch. 2.2 - Prob. 3RQCh. 2.2 - Prob. 4RQCh. 2.2 - Prob. 5RQCh. 2.2 - What is the main purpose of a single-line diagram?Ch. 2.2 - Prob. 7RQCh. 2.2 - Prob. 8RQCh. 2.3 - Prob. 1RQCh. 2.3 - Prob. 2RQCh. 2.3 - Prob. 3RQCh. 2.3 - Prob. 4RQCh. 2.3 - Prob. 5RQCh. 2.3 - Prob. 6RQCh. 2.3 - In what phase configurations are AC induction...Ch. 2.3 - Prob. 8RQCh. 2.3 - Prob. 9RQCh. 2.3 - Prob. 10RQCh. 2.3 - Prob. 11RQCh. 2.3 - Prob. 12RQCh. 2.3 - Prob. 13RQCh. 2.3 - Prob. 14RQCh. 2.3 - Prob. 15RQCh. 2.3 - Prob. 16RQCh. 2.3 - Prob. 17RQCh. 2.3 - Prob. 18RQCh. 2.3 - Prob. 19RQCh. 2.3 - Prob. 20RQCh. 2.3 - Prob. 21RQCh. 2.3 - Prob. 22RQCh. 2.4 - Interpret what each of the following pieces of...Ch. 2.4 - List three applications where a motor service...Ch. 2.4 - Prob. 3RQCh. 2.4 - Prob. 4RQCh. 2.4 - Prob. 5RQCh. 2.4 - Prob. 6RQCh. 2.4 - Prob. 7RQCh. 2.4 - Prob. 8RQCh. 2.5 - How are the contacts of a manual motor...Ch. 2.5 - Prob. 2RQCh. 2.5 - Prob. 3RQCh. 2.5 - Prob. 4RQCh. 2.5 - Prob. 1TCh. 2.5 - Prob. 2TCh. 2.5 - Prob. 4TCh. 2.5 - Prob. 5TCh. 2.5 - Prob. 6TCh. 2.5 - Prob. 1DTCh. 2.5 - Prob. 2DTCh. 2.5 - Search thelnternet forelectric motor...Ch. 2.5 - Prob. 4DTCh. 2.5 - Prob. 5DT
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- A three-phase induction motor is running at a slip of 10%. The equivalent rotor resistance of the motor is 0.09 ohm per phase. Calculate the equivalent load resistance. Answer: 0.81 ohmarrow_forwardWhich of the following is/are a general class of single-phase split-phase motor? a) resistance-start induction-run b) capacitor-start induction -run c) capacitor-start capacitor-run d) all of the above B)The single-phase split-phase motor operates on the principle of a rotating magnetic field. a) true b) false C)The voltages in a 2-phase power system are_______ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above D)The voltages in a 3-phase power system are_____ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above E)Which of the two stator windings used on single-phase split-phase motors is made up of smaller wire? a) start winding b) run winding c) either "a" or "b" d) neither "a" nor "b"arrow_forwardA 115 V, 70 Hz, 4 pole 1- phase induction motor rotating in clockwise direction with 1710 rpm. What is the slip if motor in the direction opposite of the direction of rotation.arrow_forward
- 10 What type of supply is given to the stator of the three-phase induction motor? a. Three phase supply b. Two phase supply c. Four phase supply d. Single phase supplyarrow_forwardA 3-phase, 50 Hz, 8-pole asynchronous motor rotates at a speed of 720 rpm. What is the frequency of the motor's current in Hz?arrow_forward11.A. An auxiliary phase winding is used in a single-phase fractional horsepower motor toA. decrease flux density.B. reverse motor rotation.C. increase motor speed. 11.B. How is a rotating magnetic field produced during starting in a split-phase motor?A. A low resistance coil is placed around a portion of each pole.B. An auxiliary winding is made with a high ratio of resistance to reactance.C. Brushes are shifted off the hard-neutral position.arrow_forward
- Which of the following statements about three-phase induction motor is false (A) The speed of rotation of the magnetic field is called the synchronous speed. (B) A three-phase supply connected to the rator produces a rotation magnetic field. (C)The rotating magnetic field has a constant speed and constant magnitude. (D) It is essentially a constant speed type machine.arrow_forwardAt what speed will a four-pole three-phase motor operate at when supplied with 60 Hz? A. 1800 RPMB. 900 RPMC. 670 RPM D. 3600 RPMarrow_forwardThe resistance and reactance per phase of the rotor of a 3-phase induction motor are 0.6 ohm and 5 ohms respectively. The induction motor has a star-connected rotor and when the stator is connected to a supply of normal voltage, the induced e.m.f. between the slip rings at standstill is 80 V. Calculate the current in each phase and the power factor at starting when (i) the slip-rings are shorted, (ii) slip-rings are connected to a star-connected resistance of 4 ohm per phase.arrow_forward
- If the no-load speed of a squirrel cage induction motor connected to a three-phase, 50 Hz is 12. 3333 rps, then the number of poles in the motor isarrow_forwardThree phase slip ring induction motor gives a reading of 65 V across slip rings when at rest with normal stator voltage applied. The rotor is star connected and has an impedance of (0.8 + j6) ohm per phase. Find the rotor current when the machine is (i) at standstill with the slip rings joined to a star-connected starter with a phase impedance of (4+j3) ohms and (ii) running normally with a 5% slip.arrow_forward• T or F, modify the wrong part if False, please underline twice your answer if True or False. The armature windings of an alternator can be found at the rotor, similar to DC generatorarrow_forward
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