McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 201. |
If the suction pressure of a refrigeration compressor is too high, it shows |
| A. | Lack of refrigerant on cycle |
| B. | Excessive load and evaporator |
| C. | Negligible load on evaporator |
| D. | Any of above |
| E. | None of the above |
| Answer» B. Excessive load and evaporator | |
| 202. |
The crankcase explosion of a refrigeration compressor |
| A. | Occurs due to ignition of vapours in compressor crank case |
| B. | Occurs when load is too high |
| C. | Means breakdown in compression |
| D. | Occurs between piston and cylinder heads |
| E. | Means ignition of refrigeration due to high temperature |
| Answer» A. Occurs due to ignition of vapours in compressor crank case | |
| 203. |
A cooling tower cools water |
| A. | Below wet bulb temperature |
| B. | Equal to wet bulb temperature |
| C. | Slightly above wet bulb temperature |
| D. | Wet bulb has no bearing on cooling load performance |
| E. | None of the above |
| Answer» C. Slightly above wet bulb temperature | |
| 204. |
While designing air conditioning system for a theatre the various heat loads are categorized as given below. Which one will give lowest heat load? |
| A. | Lights |
| B. | Neither absorbs nor discards heat |
| C. | Outside temperature in summer |
| D. | Human beings |
| E. | Direct sun |
| Answer» A. Lights | |
| 205. |
The secondary refrigerant used in milk chilling plants is usually |
| A. | Brine |
| B. | Ammonia solution |
| C. | Glycol |
| D. | Sodium silicate |
| E. | Any of the above |
| Answer» C. Glycol | |
| 206. |
Hydrogen cannot be liquefied at room temperature by the application of pressure, because |
| A. | It is a diatomic molecule |
| B. | It has high viscosity |
| C. | Its critical temperature is lower than the normal room temperature |
| D. | Its thermal conductivity is high |
| E. | It has low density |
| Answer» C. Its critical temperature is lower than the normal room temperature | |
| 207. |
The condension of moisture contained in air will take place at |
| A. | Any where between dry bulb temperature and wet bulb temperature |
| B. | Dew point temperature |
| C. | Dry bulb temperature |
| D. | Wet bulb temperature |
| E. | Saturation temperature |
| Answer» B. Dew point temperature | |
| 208. |
If a discharge pressure of a refrigeration compressor is too high, it shows there is (are) |
| A. | Too little or too warm condenser water |
| B. | Fouled tubes in shell and tube condenser |
| C. | Improper operations of evaporator condenser |
| D. | Overcharge of refrigerant |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 209. |
The statement that molecular weight of all gases occupy the same volume at NTP is known as |
| A. | First law of thermodynamics |
| B. | Joules law |
| C. | Charle's law |
| D. | Avogadro's law |
| E. | Dalton's law |
| Answer» D. Avogadro's law | |
| 210. |
The condition of refrigerant before and after the expansion or throttle valve in a vapour compression system is |
| A. | Wet vapour, very wet vapour |
| B. | Wet vapour, dry vapour |
| C. | High pressure saturated liquid, very wet vapour |
| D. | Very wet vapour, high pressure, saturated liquid |
| E. | None of the above |
| Answer» C. High pressure saturated liquid, very wet vapour | |
| 211. |
The function of desuperheating coil in a condenser is |
| A. | To remove heat from condenser |
| B. | To improve performance of a condenser |
| C. | To discharge the heat exchanged in condenser to the surroundings |
| D. | To remove the heat of superheat of the refrigerant before it enters the condenser |
| E. | None of the above |
| Answer» D. To remove the heat of superheat of the refrigerant before it enters the condenser | |
| 212. |
When the air temperature reaches the point where relative humidity is 100% the air is saturated because it cannot hold any more moisture. This temperature is called |
| A. | Freezing point |
| B. | Partial freezing point |
| C. | Dew point of air |
| D. | Dew point |
| E. | Dew point of water vapour |
| Answer» D. Dew point | |
| 213. |
An increase in the movement of the molecules within a solid, liquid or gas corresponds to |
| A. | A drop in temperature |
| B. | No change in temperature |
| C. | Latent heat addition/removal |
| D. | A rise in temperature |
| E. | None of the above |
| Answer» D. A rise in temperature | |
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