Sola4012 Quiz a Solutions
SOLA 4012/9007 - Session 1, 2011
SOLA 4012 /9007 Grid Connected PV
QUIZ week 9 –S1 2011 SOLUTIONS – Version A Other versions just had the answers moved around, the questions were the same.
1. (1 Mark) A module subject to shading is in a string of modules. The modules do not have bypass diodes or blocking diodes installed. The worst case power dissipation for the shaded module occurs when… a. b. c. the string is open circuited the string is short circuited reverse current flows in the string
2. (1 Mark) Which statement is most correct? When some modules in an array are hotter than others it is best to … a. b. place them all in the one string distribute the modules evenly over multiple strings
3. (1 Mark) Which statement is most correct? The IP rating of electrical equipment describes. Select the single most correct answer. a. b. c. d. the resistance to foreign objects the resistance to water the resistance to foreign objects and water internal protection for overcurrent
Version A
p.1
SOLA 4012/9007 - Session 1, 2011
4.
(2 Marks) A string has 5 modules in series. Each module has bypass diodes installed. The normal short circuit current in full sun is 4.1A If one module is shaded so that its maximum short circuit current is reduced to 1A, the characteristic of the string is shown in… (select most correct diagram.) The two curves are the unshaded and the shaded characteristics.
5.0
4.0
Current (A)
3.0
2.0 1.0
0.0 0
a.
Voltage (V)
50
100
5.0
4.0
Current (A)
3.0
2.0 1.0
0.0 0
b.
Voltage (V)
50
100
5.0
4.0
Current (A)
3.0
2.0 1.0
0.0 0
c.
Voltage (V)
50
100
5.0
4.0
Current (A)
3.0
2.0 1.0
0.0 0
d.
Voltage (V)
50
100
Version A
p.2
SOLA 4012/9007 - Session 1, 2011
4a (1 Mark) A grid connected inverter is operating at 100kVA output at 0.8 lagging power factor. The power delivered to the grid is: a. b. c. d. 100kW 125kW 80kW 64kW
P = VI
SOLA 4012 /9007 Grid Connected PV
QUIZ week 9 –S1 2011 SOLUTIONS – Version A Other versions just had the answers moved around, the questions were the same.
1. (1 Mark) A module subject to shading is in a string of modules. The modules do not have bypass diodes or blocking diodes installed. The worst case power dissipation for the shaded module occurs when… a. b. c. the string is open circuited the string is short circuited reverse current flows in the string
2. (1 Mark) Which statement is most correct? When some modules in an array are hotter than others it is best to … a. b. place them all in the one string distribute the modules evenly over multiple strings
3. (1 Mark) Which statement is most correct? The IP rating of electrical equipment describes. Select the single most correct answer. a. b. c. d. the resistance to foreign objects the resistance to water the resistance to foreign objects and water internal protection for overcurrent
Version A
p.1
SOLA 4012/9007 - Session 1, 2011
4.
(2 Marks) A string has 5 modules in series. Each module has bypass diodes installed. The normal short circuit current in full sun is 4.1A If one module is shaded so that its maximum short circuit current is reduced to 1A, the characteristic of the string is shown in… (select most correct diagram.) The two curves are the unshaded and the shaded characteristics.
5.0
4.0
Current (A)
3.0
2.0 1.0
0.0 0
a.
Voltage (V)
50
100
5.0
4.0
Current (A)
3.0
2.0 1.0
0.0 0
b.
Voltage (V)
50
100
5.0
4.0
Current (A)
3.0
2.0 1.0
0.0 0
c.
Voltage (V)
50
100
5.0
4.0
Current (A)
3.0
2.0 1.0
0.0 0
d.
Voltage (V)
50
100
Version A
p.2
SOLA 4012/9007 - Session 1, 2011
4a (1 Mark) A grid connected inverter is operating at 100kVA output at 0.8 lagging power factor. The power delivered to the grid is: a. b. c. d. 100kW 125kW 80kW 64kW
P = VI