Engineering :: Refrigeration and Air conditioning
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71. |
In central air conditioning system |
A. |
Entire equipment is placed in the air conditioned space |
B. |
There is only one machine which performs the function of air conditioning |
C. |
All the major equipment is located in one central space removed from the air to be conditioned |
D. |
Is used when small area is to be air conditioned |
E. |
None of the above |
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Answer: Option C
Explanation:
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72. |
In control cooling water system, chromates, phosphates and silicates are added to water |
A. |
To prevent scale formation |
B. |
To remove odour |
C. |
To increase remove foreign particle |
D. |
To inhibit corrosion |
E. |
To prevent algae growth |
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Answer: Option D
Explanation:
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73. |
pH value of a brine solution is |
A. |
70 |
B. |
More than |
C. |
Less than 7 |
D. |
14 |
E. |
Could be any value |
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Answer: Option E
Explanation:
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74. |
Air conditioning means |
A. |
Cooling |
B. |
Heating |
C. |
Dehumidifying |
D. |
Removal of air impurities |
E. |
All above |
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Answer: Option E
Explanation:
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75. |
The crankcase explosion of a refrigeration compressor |
A. |
Means breakdown in compression |
B. |
Occurs between piston and cylinder heads |
C. |
Occurs when load is too high |
D. |
Means ignition of refrigeration due to high temperature |
E. |
Occurs due to ignition of vapours in compressor crank case |
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Answer: Option E
Explanation:
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76. |
During adiabatic saturation process on unsaturated air |
A. |
Dry bulb temperature remains constant |
B. |
Wet bulb temperature remains constant |
C. |
Dew point temperature remains constant |
D. |
Relative humidity remains constant |
E. |
None of the above |
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Answer: Option B
Explanation:
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77. |
On a psychrometric chart sensible heating or cooling is represented by |
A. |
A horizontal line |
B. |
A vertical line |
C. |
Inclined line |
D. |
Curved line |
E. |
None of the above |
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Answer: Option A
Explanation:
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78. |
If wet bulb temperature is same as dew point, the relative humidity of air will be |
Answer: Option E
Explanation:
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79. |
Dew point is |
A. |
Percentage of moisture contained in a sample of air |
B. |
Partial pressure of water vapour in a sample of air |
C. |
The temperature of water vapour in air starts |
D. |
The temperature at which condensation of water vapour in air starts |
E. |
The temperature at which ice starts melting in presence of air without external aid |
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Answer: Option D
Explanation:
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80. |
In case of completely dry air |
A. |
Total heat is same as latent heat |
B. |
Total heat is same as sensible heat |
C. |
Total heat is sum of sensible heat and latent heat |
D. |
Total heat is sum of sensible heat required for all individual constituents |
E. |
None of the above |
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Answer: Option B
Explanation:
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