MCQOPTIONS
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MCQOPTIONS
This section includes 72 Mcqs, each offering curated multiple-choice questions to sharpen your Energy Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
If plate 1 is also a diffuse and gray surface with an emissivity value of 0.8, the net radiation heat exchange (in kW/m2) between plate 1 and plate 2 is |
| A. | 17.0 |
| B. | 19.0 |
| C. | 23.0 |
| D. | 31.7 |
| Answer» E. | |
| 52. |
If the temperature of a solid surface changes from 27 °C to 627 °C, then its emissive power changes in which ratio? |
| A. | 6:1 |
| B. | 9:1 |
| C. | 27:1 |
| D. | 81:1 |
| Answer» E. | |
| 53. |
A hollow enclosure is formed between two infinitely long concentric cylinders of radii 1 m and 2 m, respectively. Radiative heat exchange takes place between the inner surface of the larger cylinder (surface - 2) and the outer surface of the smaller cylinder (surface - 1). The radiating surfaces are diffuse and the medium in the enclosure is non-participating. The fraction of the thermal radiation leaving the larger surface and striking itself is |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.75 |
| D. | 1 |
| Answer» C. 0.75 | |
| 54. |
Heat is transferred from an electric bulb by ______. |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | All options are correct |
| Answer» D. All options are correct | |
| 55. |
Heat transfer by radiation mainly depends upon _____. |
| A. | Its temperature |
| B. | Nature of the body |
| C. | Kind and extent of its surface |
| D. | All optons are correct |
| Answer» E. | |
| 56. |
Consider the following statements:1. Absorptivity depends on wave length of incident radiation waves2. Emissivity is dependent on wave length of incident radiation wavesWhich of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» D. Neither 1 nor 2 | |
| 57. |
A solid sphere 1 of radius ‘r’ is placed inside a hollow, closed hemispherical surface 2 of radius ‘4r’. The shape factor F2-1 is |
| A. | 1/12 |
| B. | ½ |
| C. | 2 |
| D. | 12 |
| Answer» B. ½ | |
| 58. |
An electric flat-plate square heater of sides 10 cm provides 100 W power from each side. If the heater is assumed to be black, its temperature is approximately: |
| A. | 648°C |
| B. | 648 K |
| C. | 6480°C |
| D. | 6480 K |
| Answer» C. 6480°C | |
| 59. |
SOLAR_RADIATION_WHICH_REACHES_THE_SURFACE_WITHOUT_SCATTERING_OR_ABSORBED_IS_CALLED______________?$ |
| A. | Beam Radiation |
| B. | Infrared radiation |
| C. | Ultraviolet radiation |
| D. | Diffuse radiation |
| Answer» D. Diffuse radiation | |
| 60. |
Solar radiation received at any point of earth is called ______________$ |
| A. | Insolation |
| B. | Beam Radiation |
| C. | Diffuse Radiation |
| D. | Infrared rays |
| Answer» B. Beam Radiation | |
| 61. |
The scattered solar radiation is called ____________$ |
| A. | Direct Radiation |
| B. | Beam Radiation |
| C. | Diffuse radiation |
| D. | Infrared Radiation |
| Answer» B. Beam Radiation | |
| 62. |
What is unit of nuclear radiation? |
| A. | Reaumur |
| B. | Roentgen |
| C. | Rankine |
| D. | Pascal |
| Answer» C. Rankine | |
| 63. |
HHW stands for ____________ |
| A. | High and Low water |
| B. | High Level Waste |
| C. | Heated Low Level water |
| D. | High and Low Waste |
| Answer» C. Heated Low Level water | |
| 64. |
Insolation is less ____________ |
| A. | when the sun is low |
| B. | when the sun right above head |
| C. | at night |
| D. | at sun rise |
| Answer» C. at night | |
| 65. |
What does MHD stands for in the energy field? |
| A. | Magneto Hydro Dynamic |
| B. | Metal Hydrogen Detox |
| C. | Micro Hybrid Drive |
| D. | Metering Head Differential |
| Answer» B. Metal Hydrogen Detox | |
| 66. |
In what form is solar energy is radiated from the sun? |
| A. | Ultraviolet Radiation |
| B. | Infrared radiation |
| C. | Electromagnetic waves |
| D. | Transverse waves |
| Answer» B. Infrared radiation | |
| 67. |
CH2O + O2 |
| A. | CO<sub>2</sub> + O<sub>2</sub> |
| B. | H + CO<sub>2</sub> + O<sub>2</sub> |
| C. | CH<sub>2</sub>O + H<sub>2</sub>O + O<sub>2</sub> |
| Answer» D. | |
| 68. |
Oil is estimated to last for ________ more. |
| A. | 100 years |
| B. | 500 years |
| C. | A decade |
| D. | 800 years |
| Answer» B. 500 years | |
| 69. |
Which is most common source of energy from which electricity is produced? |
| A. | Hydroelectricity |
| B. | Wind energy |
| C. | Coal |
| D. | Solar energy |
| Answer» D. Solar energy | |
| 70. |
What is total amount of solar energy received by earth and atmosphere? |
| A. | 3.8 X 1024 J/year |
| B. | 9.2 X 1024 J/year |
| C. | 5.4 X 1024 J/year |
| D. | 2.1 X 1024 J/year |
| Answer» B. 9.2 X 1024 J/year | |
| 71. |
What is the rate of solar energy reaching the earth surface? |
| A. | 1016W |
| B. | 865W |
| C. | 2854W |
| D. | 1912W |
| Answer» B. 865W | |
| 72. |
Which of the following energy has the greatest potential among all the sources of renewable energy? |
| A. | Solar energy |
| B. | Wind Energy |
| C. | Thermal energy |
| D. | Hydro-electrical energy |
| Answer» B. Wind Energy | |