Nces

Multiple Choice Questions on NES
1-The amount of energy available in the wind at any instant is proportional to _ of the wind speed. (A) Square root power of two (B) Square root power of three (C) Square power (D) Cube power 2-Wind energy is harnessed as energy with the help of windmill or turbine.
(A) Mechanical
(B) Solar
(C) Electrical
(D) Heat
3-Winds having following speed are suitable to operate wind turbines.
(A) 5 – 25m/s
(B) 10 – 35m/s
(C) 20 – 45m/s
(D) 30 – 55m/s
4-The following is (are) the classification of winds
(A) Global wind
(B) Local wind
(C) Both (A) and (B)
(D) None of the above
5-Global Cold wind move from
(A) Polar to equatorial region
(B) Equatorial to polar region
(C) Equatorial to oceanic region
(D) Oceanic to Equatorial region
6-Global Cold wind generated from Oceans moves to
(A) Mountains
(B) Equator
(C) Plain areas
(D) Poles
7-_ force is responsible for forcing the global winds towards westernly
direction.
(A) Coriolis
(B) Gravitational
(C) Centripetal

8-Global winds towards westernly direction are known as
(A) Trade winds
(B) Western winds
(C) Eastern winds
(D) None of the above
9-Uneven heating occurs on land surface and water bodies are due to _
(A) Air Currents
(B) Solar radiation
(C) Lunar eclipse
(D) None of the above
10-The following factor(s) affects the distribution of wind energy
(A) Mountain chains
(B) The hills, trees and buildings
(C) Frictional effect of the surface
(D) All of the above
11-The wind intensity can be described by
(A) Reynolds number
(B) Mach number
(C) Beaufort number
(D) Froude number
12-The wind speed is measured using an instrument called
(A) Pyranometer
(B) Manometer
(C) Anemometer
(D) Wind vane
13-The rate of change of wind speed with height is called
(A) Wind shear
(B) Wind rose
(C) Wind solidity
(D) None of the above
14-At gradient height the shear force is
(A) Zero
(B) Minimum
(C) Maximum

(D) None of the above
15-The gradient height is about _ m from the ground. (A) 500 (B) 1000 (C) 1500 (D) 2000 16-The atmosphere with uniform wind speed is called the atmosphere
(A) Plain
(B) Surface
(C) Free
(D) Shear
17-Surface layer is the air layer considered from the height of local obstruction to a
height of about
(A) 50m
(B) 100m
(C) 150m
(D) 200m
18-Air layer from 100m that extends up to the gradient height is known as
(A) Surface layer
(B) Ekman layer
(C) Boundary layer
(D) None of the above
19-Low solidity rotors use which of the following force for rotation
(A) Drag
(B) Lift
(C) Centrifugal
(D) Centripetal
20-The following is the tangential velocity of the blade due to the rotation of blade.
(A) Wind velocity
(B) Incident wind velocity
(C) Blade linear velocity
(D) Relative velocity
21-Turbines blades have __ type cross section to extract energy from wind.
(A) Aerofoil
(B) Elliptical
(C) Rectangular
(D) All of the above

22-The Nacelle of windmill houses
(A) Gearbox
(B) Brakes
(C) Generator
(D) All of the above
1-Which of the following is (are) renewable resource(s)
(A) wind
(B) tides
(C) geothermal heat
(D) all of the above
2-Which of the following country generate all their electricity using renewable
energy?
(A) Iceland
(B) England
(C) USA
(D) China
3-Renwable energy often displaces conventional fuel in which of the following
area
(A) space heating
(B) transportation
(C) electricity generation
(D) all of the above
4-Which of the following is used as fuel for transportation

(A) ethanol
(B) aldehyde
(C) ketone
(D) all of the above
5-Biodiesel is produced from oils or fats using
(A) fermentation
(B) transesterification
(C) distillation
(D) none of the above
6-Photovoltaic cell converts solar energy into
(A) heat energy
(B) electric energy
(C) mechanical energy
(D) chemical energy
7-In which of the following region winds are stronger and constant
(A) deserts
(B) offshore
(C) low altitudes sites
(D) all of the above
8-Following country met more than 40% of its electricity demand from wind
energy
(A) Denmark
(B) Portugal
(C) Ireland
(D) Spain
9-Concentrated solar power (CSP) systems use __ to focus a large area of
sunlight into a small beam.
(A) lenses
(B) mirrors
(C) tracking systems
(D) all of the above
10-The difference, in temperature between the core of the planet and its surface, is
known as
(A) geothermal coefficient
(B) geothermal gradient
(C) geothermal constant
(D) none of the above

11-Biomass can be converted to
(A) methane gas
(B) ethanol
(C) biodiesel
(D) all of the above
12-The International Renewable Energy Agency (IRENA) was for
(A) 2008
(B) 2009
(C) 2010
(D) 2011
13-Which of the following was the first solar powered aircraft to complete a
circumnavigation of the world?
(A) Solar impulse
(B) Solar impulse 2
(C) Solar impulse 3
(D) Solar impulse 4
14-Following is true for biomass and biofuels
(A) their contribution in reduction in CO2 emissions is limited
(B) both emit large amount of air pollution when burned
(C) they consume large amounts of water
(D) all of the above
1-Direct Solar energy is used for

(A) Water heating
(B) Distillation
(C) Drying
(D) All of the above
2-The power from the sun intercepted by the earth is approximately
(A) 1.8 x 108 MW
(B) 1.8 x 1011 MW
(C) 1.8 x 1014 MW
(D) 1.8 x 1017 MW
3-The following is indirect method of Solar energy utilization
(A) Wind energy
(B) Biomass energy
(C) Wave energy
(D) All of the above
4-A liquid flat plate collector is usually held tilted in a fixed position, facing _ if located in the northern hemisphere. (A) North (B) South (C) East (D) West 5-The collection efficiency of Flat plate collector can be improved by (A) putting a selective coating on the plate (B) evacuating the space above the absorber plate (C) both (A) and (B) (D) None of the above 6-The efficiency of various types of collectors __ with _ temperature.
(A) increases, decreasing
(B) decreases, increasing
(C) remains same, increasing
(D) depends upon type of collector

7-Maximum efficiency is obtained in
(A) Flat plate collector
(B) Evacuated tube collector
(C) Line focussing collector
(D) Paraboloid dish collector
8-The following type of energy is stored as latent heat
(A) Thermal energy
(B) Chemical energy
(C) Electrical energy
(D) Mechanical energy
9-Which of the following type of collector is used for low temperature systems?
(A) Flat plate collector
(B) Line focussing parabolic collector
(C) Paraboloid dish collector
(D) All of the above
10-In the paraboloid dish concept, the concentrator tracks the sun by rotating
about
(A) One axes
(B) Two axes
(C) Three axes
(D) None of the above
11-The sun subtends an angle of _ minutes at the earth’s surface. (A) 22 (B) 32 (C) 42 (D) 52 12-The value of Solar Constant is (A) 1347 W/m2 (B) 1357 W/ m2 (C) 1367 W/ m2 (D) 1377 W/ m2 13-The extraterrestrial radiation flux varies by % over a year.

(A) ± 1.1
(B) ± 2.2
(C) ± 3.3
(D) ± 4.4
14-The following is (are) laws of black body radiation.
(A) Plank’s law
(B) Stefan-Boltzmann law
(C) both (A) and (B)
(D) None of the above
15-Absorption of Solar radiations at earth’s surface occur due to presence of
(A) Ozone
(B) Water vapours
(C) Carbon di-oxide
(D) All of the above
16-Global radiation =
(A) Direct radiation – Diffuse Radiation
(B) Direct radiation + Diffuse Radiation
(C) Direct radiation / Diffuse Radiation
(D) Diffuse Radiation / Direct radiation
17-The zenith angle is the angle made by the sun’s rays with the _ to a _
surface.
(A) normal, horizontal
(B) tangent, horizontal
(C) normal, vertical
(D) tangent, vertical
18-Solar radiation flux is usually measured with the help of a
(A) Anemometer
(B) Pyranometer
(C) Sunshine recorder
(D) All of the above
19-Beam radiations are measured with

(A) Anemometer
(B) Pyrheliometer
(C) Sunshine recorder
(D) All of the above
20-The angle made by the plane surface with the horizontal is known as
(A) Latitude
(B) Slope
(C) Surface azimuth angle
(D) Declination
21-The angle made in the horizontal plane between the horizontal line due south
and the projection of the normal to the surface on the horizontal plane is
(A) Hour angle
(B) Declination
(C) Surface azimuth angle
(D) Solar altitude angle
22-Surface azimuth angle varies from
(A) 0 to 90°
(B) -90 to 90°
(C) 0 to 180°
(D) -180° to 180°
23-The hour angle is equivalent to
(A) 10° per hour
(B) 15° per hour
(C) 20° per hour
(D) 25° per hour
24-The complement of zenith angle is
(A) Solar altitude angle
(B) Surface azimuth angle
(C) Solar azimuth angle
(D) Slope

25-The correction has a magnitude of _ minutes for every degree difference in
longitude.
(A) 2
(B) 4
(C) 6
(D) 8
26-The global radiation reaching a horizontal surface on the earth is given by
(A) Hourly beam radiation + Hourly diffuse radiation
(B) Hourly beam radiation – Hourly diffuse radiation
(C) Hourly beam radiation / Hourly diffuse radiation
(D) Hourly diffuse radiation / Hourly beam radiation
27-The ratio of the beam radiation flux falling on a tilted surface to that falling on
a horizontal surface is called the
(A) Radiation shape factor
(B) Tilt factor
(C) Slope
(D) None of the above