Residential Construction Academy: House Wiring (MindTap Course List)
5th Edition
ISBN: 9781337402415
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Concept explainers
Question
Chapter 8, Problem 1RQ
To determine
The description of the purpose of a weatherhead.
Expert Solution & Answer
Explanation of Solution
Weatherhead is the fitting located on the service drop end of the service entrance raceway or service entrance cable. The other name of weatherhead is a service head.
Weatherhead is designed for the reduction of the moisture amount which can access the raceway or cable.
The aim of the weatherhead is to prevent water from entering the end of a service entrance cable. Every service entrance conductor has to exit the weatherhead from a separate hole.
Service raceways at the connection point should be fitted with a weatherhead to overhead service conductors. Service entrance cables should be fitted with a weatherhead specified for use in a place that's wet. Through independently bushed openings in the weatherhead, service entrance conductors should be carried out.
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Q2/
In a design of a portable sprinkler system, the following information is given:
•
•
The sprinklers are distributed in a square pattern with radius of the wetted circle of
the sprinkler=15 m
Consumption rate = 10 mm/day
Efficiency of irrigation = 60%
Net depth of irrigation (NDI)= 80 mm.
Find the following:
1-Sprinkler application rate if HRS = 11.
2-Number of pipes required for irrigation.
(50 Marks)
3-Discharge of sprinkler, diameter of nozzle, and the working head pressure if C=0.90.
4-Diameter of the sprinkler pipe for Slope=0.
5-Pressure head at the inlet and at the dead end of the sprinkler pipe for Slope=0.
(F² + L²)((SF)² + L²)
L²
2L² ≤ D²
L² + S² ≤ D²
A, = * 1000
S*L
≤D²
N W
Af
m-11-P L'
Hf
= 1.14*109 *
1.852 *
L
*F,where c=120
D4.87
Source
main pipe
180 m
540 m
N
1
1 √m-1
F =
im/Nm+1
=
+
+
m+1
2N
6N2
i=1
Nozzle diameter (mm)
3< ds 4.8
4.8< ds 6.4
6.4
Miniatry of Higher
scent Research
University of Ke
Faculty of Engineering
Cell Engineering Department
2024-2025
Mid Exam-1 st Attempt
Time
Date: 17/04/2025
Notes: Answer all questions. Not all figures are to scale. Assume any values if you need them.
Q1/ A farm with dimensions and slopes (50 Marks)
=
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- 96mm .Manning coefficient = 0.15,
Time of work in the farm is 6
hours/day. Design consumption use of
water from the crop (ET) 16 mm/day,
Width of the agricultural machine equal
to 2.5m, Equation of infiltration - D=
12-05 and Efficiency of irrigation=
60%. You can neglect the recession lag
time. Find the width and number of the
borders, Irrigation interval and time
required to irrigate the whole farm,
Depth of flow in the inlet of border
Number of borders that irrigated in one
day and The neglected recession lag
time
Slope of irrigation %
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0-0.1
30…
Chapter 8 Solutions
Residential Construction Academy: House Wiring (MindTap Course List)
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