Foundation Midterm Exam

Why is wind turbine designed to stop operation at cut out velocity?

• To improve the efficiency

• In order to adjust the blades to wind direction

• To make a quick stop in emergencies

• To protect wheel against damage

Rock sheeting and exfoliation are resulting from:

• Swelling

• Unloading

• Crystal growth

• Abrasion

Removal of rock overburden causes rocks that were under pressure to

• contract, creating joints & cracks in a rock.

• Expand, creating joints & cracks in a rock and finally exfoliation and sheeting.

• expand, creating joints & cracks in a rock.

• contract, creating joints & cracks in a rock and finally exfoliation and sheeting.

2.5 kW h =

• 9.0*106 J

• 9.0*105 W

• 9.0*106 W

• 9.0*105 J

When using carbon dioxide containing oxygen isotope in photosynthesis process, which of the following will contain the oxygen isotope in the products of the reaction?

• Glucose only

• Water and evolved gas

• Glucose and water

• Water only

The figure represents:

• Desert Pavement

• Yardang

• Ventifact

• Ripple Mark

wind energy is harnessed by using .......

• Electron generator

• Vapor generator

• Steam generator

• Turbine generator

What is the main source for the formation of wind?

• Sun

• Vegetation

• Seasons

• Uneven land

If the vectors a= (1, 2, -2) and b= (2, 2, 3), then

• a is in the opposite direction of b.

• a = - 2 b

• a and b are perpendicular

• a and b are parallel

The unit vectors of X, Y, and Z-axis, respectively, are.........

• i= (1,0,0), j = (0,1,0), k = (0,0,1)

• i = (0,1,0), j = (1,0,0), k = (0,0,1)

• i= (1,0,1),j = (0,1,1), k = (1,0,1)

• i= (0,1,1), j = (1,0,1), k = (1,1,1)