Mechanical Engineering MCQs

2075 MCQs  (Page 55 of 208)

Attempt Mechanical Engineering Mcqs Quiz
The vapor pressure of refrigerant should be_________________?
A. Lower than atmospheric pressure
B. Higher than atmospheric pressure
C. Equal to atmospheric pressure
D. Could be anything
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Critical pressure of a liquid is the pressure_________________?
A. Above which liquid will remain liquid
B. Above which liquid becomes gas
C. Above which liquid becomes vapour
D. Above which liquid becomes solid
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In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?
A. Less than 2 kg
B. More than or equal to 3.65 kg
C. More than 10 kg
D. There is no such consideration
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The value of COP in vapour compression cycle is usually__________________?
A. Always less than unity
B. Always more than unity
C. Equal to unity
D. Any one of the above
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Condensing temperature in a refrigerator is the temperature_________________?
A. Of cooling medium
B. Of freezing zone
C. Of evaporator
D. At which refrigerant gas becomes liquid
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In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?
A. High, of the order of 25°
B. As low as possible (3 to 11°c)
C. Zero
D. Any value
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In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?
A. Collect liquid refrigerant and prevent it from going to compressor
B. Detect liquid in vapour
C. Superheat the vapour
D. Collect vapours
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Accumulators should have adequate volume to store refrigerant charge at least_________________?
A. 10%
B. 25%
C. 50%
D. 75%
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A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be_________________?
A. 0.2
B. 1.2
C. 5
D. 6
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In vapor compression refrigeration system, refrigerant occurs as liquid between_________________?
A. Condenser and expansion valve
B. Compressor and evaporator
C. Expansion valve and evaporator
D. Compressor and condenser
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Word of the Day
28 Sep
Expatriate
a person who lives outside their native country.
ملک بدری، جلا وطن کرن، شہر بدر کرنا

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