Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 1.2, Problem 1T
The voltage between the frame of a 3-phase 208 Vmotor and a grounded metal pipe is measured andfound to be 120 V. What does this indicate? Why?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
For the circuit shown below, calculate the Thévenin's equivalent circuit to the left of the resistor R.
R1
10Ω
10Ω
E 10 V
R3
R2
10Ω
O .
Rth= 15 0, Van = 5 V
O b.
Rth= 30 0, Vah = 10 V
O c. Rth= 15 0, Veh = 10 V
O d. Rh= 30 Q, Vah = 5 V
What is the peak voltage of an AC circuit which has an RMS voltage of 115V?
3. (i) Three identical capacitors are connected in delta with 400 V. If the line current is 12 A
determine the capacitance of each of the capacitors. If the 0
60° then calculate the
power dissipation in kW when it is connected in STAR
ENGG_AC_Quiz-Format_01/2016-17_V02
(ii) Three coils each having resistance 6Q and inductance are connected in star with
415V. If the line current is 30 A, find the value of inductive reactance as well as
inductance value. If 0
45° then calculate the power dissipation in kW when it is
connected in Delta.
Chapter 1 Solutions
Electric Motors and Control Systems
Ch. 1.1 - Does the severity of an electric shock increase...Ch. 1.1 - a. Calculate the theoretical body current flow...Ch. 1.1 - Normally a 6 volt lantern battery capable of...Ch. 1.1 - Prob. 4RQCh. 1.1 - What circuit fault can result in an arc flash?Ch. 1.1 - Defineeach of the following terms associated...Ch. 1.1 - Explain why an arc flash is so potentially...Ch. 1.1 - State the piece of electrical safety equipment...Ch. 1.1 - Outline the safety procedure to follow when you...Ch. 1.1 - List three pieces of personal protection...
Ch. 1.2 - Prob. 1RQCh. 1.2 - Prob. 2RQCh. 1.2 - Prob. 3RQCh. 1.2 - List the seven steps involved in a...Ch. 1.2 - Prob. 5RQCh. 1.2 - Prob. 6RQCh. 1.2 - How are the standards contained in the...Ch. 1.2 - Explain the difference between a Code Article and...Ch. 1.2 - Prob. 9RQCh. 1.2 - Prob. 10RQCh. 1.2 - Prob. 11RQCh. 1.2 - Prob. 12RQCh. 1.2 - The voltage between the frame of a 3-phase 208...Ch. 1.2 - Prob. 2TCh. 1.2 - Prob. 3TCh. 1.2 - A hot stick is to be used to open a...Ch. 1.2 - An employee is contemplating using his lockoutlock...Ch. 1.2 - Prob. 1DTCh. 1.2 - Prob. 2DTCh. 1.2 - Why can birds safely rest on high-voltage...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- The arc length voltage characteristic of a DC arc is given by the equation V=24+4L where 'V' is the arc voltage in volts and L' is the length in mm. The static volt-ampere characteristic of the power source is approximated by a straight line with no load voltage of 80V and the short circuit current of 600A. Then the optimum arc length is (mm).arrow_forwardIn the experiment No.1, the power measurement using two wattmeter method for star connected load, the value of phase current and line current is not equal. Select one: True Falsearrow_forwardWhat are the three types of opposition to current flow that impedance represents?arrow_forward
- Three inductors are connected in parallel. Inductor 1 has an inductance of 0.06 H; inductor 2 has an inductance of 0.05 H; and inductor 3 has an inductance of 0.1 H. What is the total inductance of this circuit?arrow_forwardWhat is the peak voltage of a 120V RMS AC voltage?arrow_forwardGiven the following Resistances and Inductors in Series and Voltage Source: R1 = 1,664 ohms R2 = 1,999 ohms L1 = 2 Henry L2 = 2 Henry Vs = 3 Volts Frequency = 92 Hz What is the Total Impedance (Amplitude) in ohms?arrow_forward
- The following data were obtained on a 50 kVA 2400/120 V transformer: Open circuit test, instruments on low voltage side: Waltmeter reading = 396 Watts Ammeter reading = 9.65 amperes Voltmeter reading = 120 Volts Short circuit test, instruments on high voltage side: Waltmeter reading = 810 Watts Ammeter reading = 20.8 amperes Voltmeter reading = 92 Volts Find the efficiency when rated kVA is delivered to a load having a power factor of 0.8 lagging.The following data were obtained on a 50 kVA 2400/120 V transformer : Open circuit test, instruments on low voltage side: Waltmeter reading = 396 Watts Ammeter reading = 9.65 amperes Voltmeter reading = 120 Volts Short circuit test, instruments on high voltage side: Waltmeter reading = 810 Watts Ammeter reading = 20.8 amperes Voltmeter reading = 92 Volts Find the efficiency when rated kVA is delivered to a load having a power factor of 0.8 lagging.arrow_forwardA transistor has a DC Beta of 250 and a base current, IB, of 20 microA. The collector current, IC, equals * 5 microamperes 500 microamperes 5 milliamperes 50 milliamperesarrow_forward1. For the circuit below, determine the output voltage. 30 v Si Ge 2ka Vo 2kaarrow_forward
- What is the value of a sinusoidal voltage at 7 us (micro second) from the positive going zero crossing when Vp = 15V and f = 50KHZ ?arrow_forwardThe switch in the circuit below has been open for a long time before it is closed at time t=0. We wish to find how the across the inductor and the current through the inductor change with time. a. Find the Thevenin equivalent circuit looking into a and b without the inductor present to simplify the problem to a simple RL circuit. SW1 R2 30 Q +V1 10 V R1 L1 70 Q 1 pHarrow_forwardA balanced positive-sequence wye-connected 60-Hz three-phase source has line-to-line voltages of VL = 440 V rms. This source is connected to a balanced wye-connected load. Each phase of the load consists of a 0.5-H inductance in series with a 50-? resistance. Assume that the phase of Van is zero. A) Find the line-to-neutral voltage phasor Van. Enter your answer using polar notation. Express argument in degrees. B) Find the line-to-neutral voltage phasor Vbn. Enter your answer using polar notation. Express argument in degrees. C) Find the line-to-neutral voltage phasor Vcn. Enter your answer using polar notation. Express argument in degrees. D) Find the line-to-line voltage phasor Vab. Enter your answer using polar notation. Express argument in degrees.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Electrical Transformers and Rotating MachinesMechanical EngineeringISBN:9781305494817Author:Stephen L. HermanPublisher:Cengage Learning
Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning
Electrical Transformers and Rotating Machines
Mechanical Engineering
ISBN:9781305494817
Author:Stephen L. Herman
Publisher:Cengage Learning
Refrigeration and Air Conditioning Technology (Mi...
Mechanical Engineering
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:Cengage Learning
Fluid Mechanics - Viscosity and Shear Strain Rate in 9 Minutes!; Author: Less Boring Lectures;https://www.youtube.com/watch?v=_0aaRDAdPTY;License: Standard youtube license