Connect 1 Semester Access Card For Electric Motors And Control Systems
2nd Edition
ISBN: 9781259550195
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
Chapter 2.1, Problem 5RQ
a.
To determine
Difference between high current carrying wireand low current carrying wire in electrical diagram.
b.
To determine
Difference between wires that cross but do not electrically connected and wires that cross and electrically connected in electric diagram.
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Answer question D only using by hand
first darw cylinder then calculate show me st
The phase currents in a delta-connected three-phase
load are as follows: between the red and yellow lines,
30 A at p.f. 0.707 leading; between the yellow and blue
lines, 20 A at unity p.f.; between the blue and red
lines, 25 A at p.f. 0.866 lagging. Calculate the line
currents and draw the complete phasor diagram.
ANS:
21.6 A in R, 49.6 A in Y, 43.5 A in B
. Two wattmeters connected to measure the input to
a balanced three-phase circuit indicate 2500 W and
500 W respectively. Find the power factor of the
circuit: (a) when both readings are positive; (b) when
the latter reading is obtained after reversing the con
nections to the current-coil of one instrument. Draw
the phasor and connection diagrams.
ANS:
0.655, 0.359
Chapter 2 Solutions
Connect 1 Semester Access Card For 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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- Explain the advantage of connecting the low-voltage winding of distribution transformers in star. A factory has the following load with power factor of 0.9 lagging in each phase. Red phase 40 A, yellow phase 50 A and blue phase 60 A. If the supply is 400 V, three phase, four-wire, calculate the current in the neutral and the total active power. Draw a phasor diagram for phase and line quantities. Assume that, relative to the current in the red phase, the current in the yellow phase lags by 120° and that in the blue phase leads by 120°. ANS: 17.3 A, 31.2 kWarrow_forwardA three-phase, 400 V system has the following load connected in delta: between the red and yellow lines, a non-reactive resistor of 100 Ω; between the yellow and blue lines, a coil having a reactance of 60 Ω and negligible resistance; between the blue and red lines, a loss-free capacitor having a reactance of 130 Ω. Calculate: (a) the phase currents; (b) the line currents. Assume the phase sequence to be R–Y, Y–B and B–R. Also, draw the complete phasor diagram. ANS: 4.00 A, 6.67 A, 3.08 A, 6.85 A, 10.33 A, 5.8 Aarrow_forwardWith the aid of a circuit diagram, show that two wattmeters can be connected to read the total power in a three-phase, three-wire system. Two wattmeters connected to read the total power in a three-phase system supplying a balanced load read 10.5 kW and −2.5 kW respectively. Calculate the total active power. Drawing suitable phasor diagrams, explain the significance of: (a) equal wattmeter readings; (b) a zero reading on one wattmeter. ANS: 8 kWarrow_forward
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