N1 Engineering Science April 2016 Memorandum
Transcript of N1 Engineering Science April 2016 Memorandum
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NATIONAL CERTIFICATE
APRIL EXAMINATION
ENGINEERING SCIENCE N1
6 APRIL 2016
This marking guideline consists of 12 pages.
MARKING GUIDELINE
MARKING GUIDELINE -2- T560(E)(A6)T ENGINEERING SCIENCE N1
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ü= 1 mark. √ = ½ mark. Calculations:
• 1 mark for substitution and conversion of values. • 1 mark for answer and unit. • -½ mark for using the incorrect unit.
QUESTION 1 1.1 1.1.1 C 1.1.2 D 1.1.3 B 1.1.4 A (4 x 1) (4) 1.2
üü Resultant = 52 m,30°ü
(2)
1.3 1.3.1
üü
kms
s
tvstsv
75,93
)6015(375
.
=
´=
=
=
MARKING GUIDELINE -3- T560(E)(A6)T ENGINEERING SCIENCE N1
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1.3.2
üü
(2 x 2)
(4) 1.4 1.4.1
üüü
(3)
1.4.2
üü
(2) [15]
min122,075,46875,93
%2537575,93
==
=
´=
=
=
thourst
t
t
vst
tsv
2.333,13040
-=
=
D=
sma
a
tva
MARKING GUIDELINE -4- T560(E)(A6)T ENGINEERING SCIENCE N1
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QUESTION 2 2.1 2.1.1
2.1.2 2.1.3 2.1.4 2.1.5
False False True True False
(5 x 1)
(5)
2.2 2.2.1
üü
2.2.2
üü
(2 x 2)
(4)
mEE
LVRELE
VR
Dist
Dist
DistDist
Dist
Dist
5,105,33
=´=´=
=
NE
E
MALE
ELMA
2205,2
550
=
=
=
=
MARKING GUIDELINE -5- T560(E)(A6)T ENGINEERING SCIENCE N1
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2.3
üüü
OR
MARKING GUIDELINE -6- T560(E)(A6)T ENGINEERING SCIENCE N1
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By calculations Consider both A and B up
A B 125N x - A cos 400 = -0,766A B Cos 500 = 0,643B 0 Y A sin 400 = 0,643 B sin 500 = 0.766B -125
B = 1.191A 1
0,643A + 0,766B = 7,5 2 1 in 2 0,643A + 0,766 x 1,191A = 7,5 A = 4.823N Therefore B = 1.191 x 4,823 = 5,744 kN üüü
(3)
2.4
üü
(2)
NP
P
PRMLM
333,833212521253
=
´=
´=´=
MARKING GUIDELINE -7- T560(E)(A6)T ENGINEERING SCIENCE N1
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2.5
üü Equilibrant = 2500N East 32°Northü OR By calculations
(3) [17]
QUESTION 3 3.1 3.1.1 B 3.1.2 A 3.1.3 B 3.1.4 A 3.1.5 B (5 x 1) (5) 3.2
üü
(2)
kJWWW
sFW
105000105200525
==
´=´=
MARKING GUIDELINE -8- T560(E)(A6)T ENGINEERING SCIENCE N1
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3.3 3.3.1
üüü
(3)
3.3.2
üü
(2) [12]
QUESTION 4 4.1 4.1.1
4.1.2 4.1.3 4.1.4 4.1.5
Higher Lower Removed Radiation pyrometer Joule
(5 x 1)
(5)
4.2
üüü
(3)
kJWJW
WsFW
6500650105006
==
´=´=
MARKING GUIDELINE -9- T560(E)(A6)T ENGINEERING SCIENCE N1
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4.3 4.3.1
4.3.2 4.3.3
Conduction Convection Convection/radiation
(3 x 1)
(3)
4.4
üü
(2)
4.5 4.5.1
4.5.2
ü
ü
(2 x 1)
(2)
4.6 4.6.1
4.6.2 4.6.3
Heat is transferred between the lead and water. The law of conservation of energy. The temperature of both materials is the same.
(3 x 1)
(3) [18]
QUESTION 5 5.1 5.1.1
5.1.2 5.1.3 5.1.4 5.1.5
Atom Matter Molecule Melting Condensation
(5 x 1)
(5)
5.2 Gas: particles far from each other
Liquid: particles not far from each other Solid: particles close to each other
(3)
5.3 Electron – negative
Neutrons – neutral Proton – positive
(3)
MJQJQ
QtcmQ
87,4100700418
)1555(4187250
==
-´´=D´´=
mmlml
llll fo
895895,0
105,3536
=D=D
-=D
-=D
Ctt
ttt fo
!602585
=D
-=D
-=D
MARKING GUIDELINE -10- T560(E)(A6)T ENGINEERING SCIENCE N1
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5.4 When an atom has gained or lost an electron. ü (1) [12]
QUESTION 6 6.1 6.1.1
6.1.2 6.1.3 6.1.4 6.1.5
C D A E B
(5 x 1) (5) 6.2 6.2.1
6.2.2 6.2.3 6.2.4
Insulator – is a material that prevents the flow of electrical current. Resistance – is a material that resists the flow of electrical current. Potential difference – is the electrical pressure required to overcome the resistance in order for a current to flow. Joule's Law – the quantity of heat generated by an electrical current is directly proportional to ???? Is something not missing here?
(4 x 1) (4) 6.3 6.3.1
üü
6.3.2
üü
6.3.3
OR OR üü
(3 x 2) (6)
80,986ΩRR
RRR
t
t
t
=
+=
+=
2301
12511
111
21
mAIAI
I
RVI
296296,0986,8024
==
=
=
WPP
IVP
104,7296,024
=´=´=
WPP
RIP
096,7986,80296,0 2
2
=´=
=
WP
P
RVP
112,7986,80242
2
=
=
=
MARKING GUIDELINE -11- T560(E)(A6)T ENGINEERING SCIENCE N1
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6.4 6.4.1 6.4.2
Resistivity – Different metals have different resistances. Length – The longer the conductor, the higher the resistance.
(2 x 1) (2) 6.5 6.5.1
6.5.2
Alloys – no change in resistance.ü Insulators – The resistance decreases with the rise in temperature.ü
(2 x 1) (2) 6.6
üüü
(3)
MARKING GUIDELINE -12- T560(E)(A6)T ENGINEERING SCIENCE N1
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6.7
üüüü
(4) [26]
TOTAL: 100