Mechanical Engineering MCQs

2075 MCQs  (Page 59 of 208)

Attempt Mechanical Engineering Mcqs Quiz
Short horizontal lines on pressure-enthalpy chart show__________________?
A. Constant pressure lines
B. Constant temperature lines
C. Constant total heat lines
D. Constant entropy lines
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Ammonia is __________________?
A. Non-toxic
B. Non-inflammable
C. Toxic and non-inflammable
D. Highly toxic and inflammable
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Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of___________________?
A. 1 : 1
B. 1 : 9
C. 9 : 1
D. 1 : 3
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Where does the lowest temperature occur in a vapour compression cycle ?
A. Condenser
B. Evaporator
C. Compressor
D. Expansion valve
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A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?
A. Ammonia
B. Carbon dioxide
C. Freon
D. Brine
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Highest pressure encountered in a refrigeration system should be________________?
A. Critical pressure of refrigerant
B. Much below critical pressure
C. Much above critical pressure
D. Near critical pressure
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If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?
A. Same
B. More
C. Less
D. More/less depending on rating
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Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?
A. Strong solution to weak solution
B. Weak solution to strong solution
C. Strong solution to ammonia vapour
D. Ammonia vapour to weak solution
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Which of the following is not a desirable property of a refrigerant_________________?
A. High triiscibility with oil
B. Low boiling point
C. Good electrical conductor
D. Large latent heat
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At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant_________________?
A. Decreases
B. Increases
C. Remains same
D. Depends on other factors
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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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