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MindTap Electrical for Fletcher's Residential Construction Academy: House Wiring, 5th Edition [Instant Access], 4 terms (24 months)
5th Edition
ISBN: 9781337553070
Author: FLETCHER
Publisher: Cengage Learning US
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Question
Chapter 17, Problem 1RQ
To determine
The other name of the fluorescent lamp by NEC® .
Expert Solution & Answer
Explanation of Solution
The NEC® refers to fluorescent lamps as electric discharge lamps. They have been in use for years and are an outstanding source of light. Light is generated when an electric current at each end of a sealed glass tube is passed via tungsten cathodes. There is an inert gas filling the tube, like argon or krypton. The tube is also filled with mercury in a very small amount. Electrons are released from cathodes and strike mercury vapor particles which lead to the development of ultraviolet radiation, causing the glass tube inside to glow with a phosphorous coating.
Conclusion:
The NEC® refers to a fluorescent lamp as an electric discharge lamp.
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8-17. Determine the vertical displacement of joint C if
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Please solve all points
For the I section prestressed concrete beam with a straight tendon shown in Fig
below which is under the prestressing force, and U.D.L. Analyze the stresses at Mid-
span at: A- transfer stage (due to initial prestress P. and self weight wo)
B- at service stage. (due to effective prestress Pe and full loads)
Check stresses with the ACI permissible stresses.
Given:
Initial prestress force Pi = 750 kN
Effective prestress force Pe = 640 kN
Wo (self) = 2.7 kN/m
=
W (D+L) 8 kN/m
e = 130 mm
I 5 10 mm²
fci = 25 MPa (at transfer age), f' = 35 MPa (at service age)
ASECTION 114 000 mm²
W=4.75 kN/m
|-
12 m
F
I
610mm
Chapter 17 Solutions
MindTap Electrical for Fletcher's Residential Construction Academy: House Wiring, 5th Edition [Instant Access], 4 terms (24 months)
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