Free Printable WIND ENERGY

1.

Power available in the wind spectra _____________________

a)

P=\frac{1}{2}\ \rho_a\ A_T\ V^3

b)

$P=\frac{1}{2}\ \rho_a\ A_T\ V^2$

c)

$P=\frac{1}{2}\ \rho_a\ A_T^3\ V^{ }$

d)

$P=\frac{1}{2}\ \rho_a\ A_T\ V^{ }$

2.

Equation for power coefficient Cp = ____________

a)

$C_P=\ \ \frac{2P_T}{\rho_a\ A_{T\ }V^{ }}$

b)

$C_P=\ \ \frac{2P_T}{\rho_a\ A_{T\ }V^2}$

c)

$C_P=\ \ \frac{2P_T}{\rho_a\ A_{T\ }V^3}$

d)

$C_P=\ \ \frac{2P_T}{\rho_a\ A_{T\ }^3V^{ }}$

3.

Coefficient of power can be calculated with $C_{P\ }=\frac{2\ T_T\ \Omega}{\rho_a\ A_TV^3}$

a)

TRUE

b)

FALSE

4.

What is tip speed ratio ?

a)

The tip speed ratio is given by the ratio between the velocity and power coefficient of the rotor.

b)

The tip speed ratio is given by the ratio between the torque coefficient and power coefficient of the rotor.

c)

The tip speed ratio is given by the ratio between the power coefficient and torque coefficient of the rotor.

d)

The tip speed ratio is given by the ratio between the torque coefficient and velocity of the rotor.

5.

Tip speed ratio is denoted using :

a)

$\delta$

b)

$\sigma$

c)

$\rho$

d)

\lambda

6.

Select the correct equations that can be used for calculating Tip speed Ratio (More than One Option) :

a)

$\frac{C_P}{C_T}$

b)

$\frac{C_T}{C_P}$

c)

$\frac{R\ V}{\Omega}$

d)

$\frac{R\ \Omega}{V}$

7.

Check whether the sentence is True or False

Horizontal axis wind turbines (HAWT) have their axis of rotation horizontal to the ground and almost parallel to the wind stream

a)

TRUE

b)

FALSE

8.

Select the statements true for Horizontal Axis Wind Turbines (More than One Option)

a)

Their axis of rotation vertical to the ground.

b)

The generator and gearbox of these turbines are placed in ground.

c)

Need for the tail or yaw drive to orient the turbine towards wind.

d)

Relatively high power coefficient.

9.

Select the correct statement applicable for single bladed HAWT

a)

The drag losses are maximum for single bladed turbines.

b)

Single bladed designs are very popular due to visual acceptability.

c)

Single bladed turbines are cheaper due to savings on blade materials.

d)

They have high Solidity

10.

Which Statement is TRUE for an Upwind Turbine ?

a)

They may be uneven loading on the blades.

b)

In Upwind turbines the rotors are placed at the lee side of the tower.

c)

No need of yaw mechanism.

d)

They do not have the problem of tower shadow.

11.

Select the Vertical Axis Wind Turbines

( more than 1 option )

a)

Musgrove rotor

b)

Rotrics rotor

c)

Savonius rotor

d)

Davonius rotor

12.

Select the statements about Darrieus rotor ( More than One Option)

a)

Works at high tip speed ratio

b)

Works at low tip speed ratio

c)

They are not self-starting

d)

They are self-starting

13.

Select the statements about Savonius Rotor (More than 1 option)

a)

Blades arranged in ‘S’ shape

b)

It is a Horizontal Axis Wind Turbine

c)

Works under lift force

d)

Works under drag force

14.

Check whether TRUE or FALSE

During the day time, sea surface gets heated faster than the land. As a result, the air near the sea surface

rises, forming a low pressure region. This attracts cool air to the sea from the land. This is called the sea breeze.

a)

FALSE

b)

TRUE

15.

The speed and direction of wind change rapidly while it passes through rough surfaces and obstructions like buildings, trees and rocks. This is due to _____________

a)

Wind Shear

b)

Anemometry

c)

Turbulence

d)

Recurrence effect

16.

Select the TRUE statements related to acceleration effect of wind

a)

The degree of acceleration does not depends on the shape of the ridge.

b)

The acceleration effect is high when the prevailing wind is parallel to the ridge line.

c)

The acceleration is caused by the squeezing of wind layers over the mount.

d)

The degree of acceleration depends on the shape of the ridge.

17.

Select the correct statements related to Eolian Feature. ( More than one option)

a)

Sand dunes are one example for the eolian feature

b)

Eolian features are the formations on land surface due to continuous strong wind.

c)

Deformation of Trees are one example for eolian feature

d)

Flagging is an example for eolian feature

18.

Select the figure of Cup Anemometer

a)

b)

c)

d)

19.

Check whether the following statement related to Sonic Anemometer is True Or False

"Sonic anemometers measure the wind velocity by sensing the changes in the speed of sound in air."

a)

TRUE

b)

FALSE

20.

The equation for pressure exerted on the plate P by the

wind in pressure plate anemometer is given by

a)

$P=\frac{1}{2}\ \rho_a\ V^3$

b)

$P=\frac{1}{2}\ \rho_a\ V^2$

c)

$P=\frac{1}{2}\ \rho_a\ V^{ }$

d)

$P=\rho_a\ V^3$

WIND ENERGY

Total questions: 20

Worksheet time: 12mins

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