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# UPRVUNL’21 ME: Daily Practices Quiz. 11-Sep-2021

Quiz: Mechanical Engineering
Exam: UPRVUNL
Topic: RAC

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. The wet bulb temperature is a measure of which humidity?
(a) Relative
(b) Absolute
(c) Specific
(d) None of above

Q2. The curved lines on Psychrometric chart indicate
(a) Specific humidity
(b) Relative humidity
(c) Dew point temperature
(d) Dry bulb temperature

Q3. If the air is passed over the cooling coils, then this process is termed as
(a) Sensible heating
(b) Cooling with humidification
(c) Cooling with dehumidification
(d) None of the above

Q4. The desuperheating coil in a condenser performs the function of:
(a) improving the heat of superheat of the refrigerant before it goes into condenser
(b) Removing heat from condenser
(c) Improving condenser performance
(d) To humidity the refrigerant before it goes into condenser

Q5. In case of sensible cooling of air, the coil efficiency is given by (BPF = by pass factor) :
(a) BPF –1
(b) 1 – BPF
(c) 1/BPF
(d) 1 + BPF

Q6. During mixing of steams in case of air conditioning, the process is associated with:
(a) Throttling
(c) Isobaric
(d) Isochoric

Solutions
S1. Ans. (b)
Sol. Absolute
S2. Ans. (b)
Sol. Relative humidity
S3. Ans. (c)
Sol. If the air is passed over the cooling coils, then this process is termed as cooling with dehumidification
S4. Ans. (c)
Sol. The desuperheating coil in a condenser performance the function of improving condenser performance.
S5. Ans. (b)
Sol. Efficiency of coil (η) = 1-BPF
S6. Ans. (b)
Sol. During mixing of steams in case of air conditioning, the process is associated with adiabatic.

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