Power System - I (3140914) MCQs

MCQs of Introduction to Wind and Solar Power Generation

Showing 51 to 60 out of 137 Questions
51.
Wind turbine with low value of solidity
(a) Runs slower
(b) Runs faster
(c) Produces higher torque
(d) Has low efficiency
Answer:

Option (b)

52.
Stall regulation is used with turbines
(a) Having diameter less than 25 m
(b) Having diameter more than 25 m
(c) Having rotor of large solidity
(d) Having rotor with pitch control
Answer:

Option (a)

53.
Grid connected wind generators usually have maximum penetration of
(a) 10 - 20 %
(b) 20 - 30 %
(c) 30 - 40 %
(d) 40 - 50 %
Answer:

Option (a)

54.
Potential sites for wind generation are those having energy density of
(a) 25 - 50 W/m2
(b) 50 - 100 W/m2
(c) 100 - 200 W/m2
(d) Greater than 200 W/m2
Answer:

Option (d)

55.
What is turbulence intensity for the mean wind speed of 6.5 m/s with a standard deviation of 2.96 m/s?
(a) 0
(b) 0.46
(c) 1
(d) 2.17
Answer:

Option (b)

56.
Density of air at sea level and 15°C is
(a) 1.225 kg/m3
(b) 1.225 kg/cm3
(c) 1.225 gm/m3
(d) 1.225 gm/cm3
Answer:

Option (a)

57.
What will be the total wind power in an area where the average wind speed is 6 m/s, turbine rotor diameter 60 m, air temperature 25°C and density 1.225 kg/m3?
(a) 0.375 kW
(b) 3.75 kW
(c) 37.5 kW
(d) 375 kW
Answer:

Option (d)

58.
What will be the difference in the power output from the wind turbine if the wind speed varies from 4 m/s to 8 m/s?
Where
Turbine rotor diameter = 60 m
Air temperature = 25°C
Air density = 1.225 kg/m3
(a) 0.775 kW
(b) 7.75 kW
(c) 77.5 kW
(d) 775 kW
Answer:

Option (d)

59.
Percentage increase in energy content from the same wind power plant at the same site if the wind speed varies from 6 m/s to 7 m/s
Where
Turbine rotor diameter = 60 m
Air temperature = 25°C
Air density = 1.225 kg/m3
(a) 11%
(b) 25%
(c) 59%
(d) 80%
Answer:

Option (c)

60.
Energy content from the same wind power plant at the same site for wind speed 4 m/s for half of the year and 8 m/s for the rest of the year is
(a) 788 kWh/m2 in a year
(b) 788 MWh/m2 in a year
(c) 1576 kWh/m2 in a year
(d) 1576 MWh/m2 in a year
Answer:

Option (c)

Showing 51 to 60 out of 137 Questions