Power System(Generation)-03

Generation-03:

57)   The identification of a two stroke engine is given by

a. Cooling system
b. Lubrication system
c. Absence of valve
d. All of these

58)   Maximum temperature developed in a diesel engine is in the range of

a. 2000 - 2500 °C
b. 500 – 1000 °C
c. 1500 – 2000 °C
d. 1000 – 1500 °C

59)   High output diesel engines are started by

a. self starter.
b. compressed air.
c. battery.
d. cranking.

60)   Heating value of diesel is around _________.

a. 4000 kcal/kg
b. 10000 kcal/kg
c. 15000 kcal/kg
d. 20000 kcal/kg

 

61)   The temperature of the cooling water leaving the diesel engine should not exceed.

a. 25 °C
b. 40 °C
c. 85 °C
d. 70 °C

62)   A module in a solar panel refers to_______________.

a. series arrangement of solar cells.
b. parallel arrangement of solar cells.
c. series and parallel arrangement of solar cells.
d. None of the above

63)   The efficiency of the solar cell is about

a. 25 %
b. 15 %
c. 40 %
d. 60 %

64)   For satellites the source of energy is

a. Solar cell
b. Fuel cells
c. Edison cells
d. Cryogenic storage

65)   The output of the solar cell is of the order

a. 0.5 W
b. 1.0 W
c. 5.0 W
d. 10.25 W

66)   In a fuel cell, cathode is of

a. Oxygen
b. Ammonia
c. Hydrogen
d. Carbon monoxide

67)   What is the maximum possible output of a solar array?

a. 300 W/m2
b. 100 W/m2
c. 250 W/m2
d. 500 W/m2

68)   The current density of a photo voltaic cell ranges from

a. 10 – 20 mA/cm2
b. 40 – 50 mA/cm2
c. 20 – 40 mA/cm2
d. 60 – 100 mA/cm2

69)   A pyrometer is used for the measurements of

a. Diffuse radiations only.
b. Direct radiations only.
c. Both direct and diffused radiations.
d. None of the above.

70)   Reflector mirrors used for exploiting the solar energy are called

a. Mantle
b. Heliostats
c. Diffusers
d. Ponds

71)   The function of a solar collector is of converting solar energy into

a. Radiations
b. Electrical energy directions
c. Thermal energy
d. All of the above

72)   What are pyrheliometers?

a. Instruments measures beam radiations

b. Diffuse radiations
c. Direct radiations only
d. None of the above

73)   Temperature attained by cylindrical parabolic collector is of the order of

a. 50 – 100 °C
b. 100 – 150 °C
c. 150 – 200 °C
d. 200 – 300 °C

74)   In a solar collector, why is the transparent cover provided for?

a. Protect the collector from dust
b. Reduce the heat losses from collector beneath to atmosphere
c. Transmit solar radiation only
d. All of the above

75)   Which of the following liquid metal is not used as a magneto hydrodynamic generation (MHD) working fluid?

a. Potassium
b. Sodium
c. Lithium
d. All of these

76)   The nature of the current developed in MHD generator is

a. AC
b. DC
c. Both (a) and (b)
d. None of these

77)   Coal is processed and burnt in the combustor of a hybrid MHD at a high temperature and pressure with the preheated air to form which among the following element?

a. Steam
b. Plasma
c. Coke
d. None of these

78)   The harmful emissions such as sulphur are removed from gas before it is discharged to the atmosphere through which instrument?

a. Duct
b. Mufflers
c. Stark
d. All of these

79)   What is the working fluid in closed cycle MHD system?

a. Helium and argon
b. Coal
c. Natural gas
d. Potassium

80)   In a MHD generator the conductor is made of

a. Copper
b. Liquid metal
c. Gas
d. Liquid metal or gas

81)   Power output per unit volume of a MHD generator is proportional to

a. Specific electrical conductivity of gas
b. Square of the magnetic field strength
c. Square of the fluid velocity
d. All of these

82)   Tidal energy utilizes

a. Kinetic energy of water
b. Potential energy of water
c. Both (a) and (b)
d. None of the above

83)   In a fuel cell, electrical energy is produced by

a. Reaction of hydrogen with oxygen
b. Thermionic action
c. Combustion of fuel in the absence of oxygen
d. All of the above

84)   Thermal gradient in a geo thermal plant is given by

a. Heat flux * thermal conductivity
b. Heat flux / thermal conductivity
c. Thermal conductivity / heat flux
d. None of these

85)   Tidal energy development needs

a. Huge capacity and long construction time.
b. Huge capacity and low construction time.
c. Low capacity and long construction time.
d. Low capacity and low construction time.

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