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- Question 1 of 20
The correct sequence for different types of heat exchangers in the decreasing order of effectiveness isCorrectIncorrect
- Question 2 of 20
In a double-pipe counterflow heat exchanger, 1000 kg/h of oil having a specific heat 20 J/kg-K is cooled from 150 °C to 125 °C by 1250 kg/h of fluid of specific heat 16 J/kg-K. The fluid leaves the heat exchanger at 75 °C. In such case, the temperature at which the cooling fluid is entering the heat exchanger and LMTD will beCorrectIncorrect
- Question 3 of 20
Which of the following properties of air Increase with rise in temperature?
- Question 4 of 20
The laminar boundary layer occurs when a cold fluid flows over a hot plate.In which of the following positions, the temperature gradient assumes zero value?CorrectIncorrect
- Question 5 of 20
The Reynolds-Colburn analogy,which is used to determine heat transfer coefficient from the measurement of frictional drag, is applicable toCorrectIncorrect
- Question 6 of 20
An oxygen and nitrogen mixture has transmissivity for heat radiations that is practically equal toCorrectIncorrect
- Question 7 of 20
Consider the following statements :
1.An ammonia absorption refrigerator has a COP more than 3 and is superior to vapour compression system.
2.Ammonia absorption machines are preferable where waste heat is available from an existing source.
3.Absorption refrigerator has no moving part and hence needs little maintenance.
4.The partial pressure of ammonia vapour varies, being high in the condenser and low in the evaporator.
Which of these statements are correct?CorrectIncorrect
- Question 8 of 20
A vapour compression refrigerator has a COP of 4, and extracts 10 kJ of heat from the cold reservoir. If this machine is worked as a heat
pump, how much heat will it deliver to the environment?CorrectIncorrect
- Question 9 of 20
A refrigerator based on reversed Carnot cycle works between refrigeration and condenser temperatures of -23 °C and 27 °C.If a cooling rate of 5 kW is desired,what will be the required power in kW?CorrectIncorrect
- Question 10 of 20
Ammonia used as refrigerant is non-corrosive toCorrectIncorrect
- Question 11 of 20
In a VCR plant, the refrigerant leaves the compressor and evaporator with enthalpy of 205kJ/kg and 177 kJ/kg respectively. Enthalpy of the refrigerant leaving the condenser is 105kJ/kg. If the mass flow rate of the refrigerant is 0.2 kg/s, the refrigeration effect will beCorrectIncorrect
- Question 12 of 20
When unsaturated air undergoes adiabatic saturation, which of the following properties decreases?
- Question 13 of 20
When only sensible heat is added to a sample of air, the process is represented on the psychrometric chart as aCorrectIncorrect
- Question 14 of 20
During the sensible cooling process,specific humidityCorrectIncorrect
- Question 15 of 20
The comfort conditions in air conditioning system are defined byCorrectIncorrect
- Question 16 of 20
The most suitable pair of refrigerant and absorbent combination for solar refrigeration isCorrectIncorrect
- Question 17 of 20
At what depth below the free surface of oil having a density of 784 kg/m3 will the pressure be very nearly equal to 1 bar?CorrectIncorrect
- Question 18 of 20
The vapour pressure is the characteristic fluid property involved in the phenomenon ofCorrectIncorrect
- Question 19 of 20
For stability of a floating body (M = metacentre, G = centre of gravity and B = centre of buoyancy)CorrectIncorrect
- Question 20 of 20
The resultant of all normal pressures on a body immersed in liquid actsCorrectIncorrect
Leaderboard: IES Mechanical 3
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