Description : Claude gas liquefaction process employs cooling (A) At constant pressure (B) By throttling (C) By expansion in an engine (D) None of these
Last Answer : (C) By expansion in an engine
Description : Claude's liquefaction process employs the cooling of gases by (A) Expansion in an engine (B) Following a constant pressure cycle (C) Throttling (D) None of these
Last Answer : A) Expansion in an engine
Description : Linde process of gas liquefaction employs (A) Exchange of heat with colder stream (B) Adiabatic expansion through a throttle valve (Joule-Thomson expansion) (C) Adiabatic expansion against a piston or in a turbine (D) Merely compressing the gas beyond its critical pressure
Last Answer : (B) Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Description : Claude process of gas liquefaction employs (A) Merely compression of gas beyond its critical pressure (B) Joule-Thomson expansion cooling (C) Heat exchange with colder stream (D) Adiabatic expansion against a piston or in a turbine
Last Answer : (D) Adiabatic expansion against a piston or in a turbine
Description : The adiabatic throttling process of a perfect gas is one of constant enthalpy (A) In which there is a temperature drop (B) Which is exemplified by a non-steady flow expansion (C) Which can be performed in a pipe with a constriction (D) In which there is an increase in temperature
Last Answer : (C) Which can be performed in a pipe with a constriction
Description : One of the purposes of sub-cooling the liquid refrigerant is to (a) reduce compressor overheating (b) reduce compressor discharge temperature (c) increase cooling effect (d) ensure that only liquid and not the vapour enters the expansion (throttling) valve
Last Answer : Ans: d
Description : Which of the following processes are thermodynamically reversible (a) throttling (b) free expansion (c) constant volume and constant pressure (d) hyperbolic and pV = C (e) isothermal and adiabatic.
Last Answer : Answer : e
Description : Work done is zero for the following process (a) constant volume (b) free expansion (c) throttling (d) all Of the above (e) none of the above.
Last Answer : Answer : d
Description : 6. Liquefaction of gases cannot be done by (A) Exchange of heat with colder stream (B) Adiabatic expansion through a throttle valve (Joule-Thomson expansion) (C) Merely compressing it beyond critical pressure (D) Adiabatic expansion against a piston or in a turbine
Last Answer : (C) Merely compressing it beyond critical pressure
Description : All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure. (A) Oxygen (B) Nitrogen (C) Air (D) Hydrogen
Last Answer : (D) Hydrogen
Description : On mollier chart ,free expansion or throttling process from High pressure to atmosphere is represented by • Horizontal straight line • Vertical straight line • Straight inclined line • Curved line
Last Answer : • Horizontal straight line
Description : If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as (a) free expansion (b) hyperbolic expansion (c) adiabatic expansion (d) parabolic expansion (e) throttling.
Description : All gases during throttling process at atmospheric temperature and pressure show a cooling effect except (A) CO2 (B) H2 (C) O2 (D) N2
Last Answer : (B) H2
Description : What happens in a reversible adiabatic expansion process? (A) Heating takes place (B) Cooling takes place (C) Pressure is constant (D) Temperature is constant
Last Answer : (B) Cooling takes place
Description : The principle applied in liquefaction of gases is (A) Adiabatic expansion (B) Joule-Thomson effect (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : All gases above its inversion temperature, in a throttling process will show (A) A heating effect (B) No change in temperature (C) A cooling effect (D) Either (A) or (C)
Last Answer : (A) A heating effect
Description : Throttling (Joule-Thomson effect) process is a constant __________ process. (A) Enthalpy (B) Entropy (C) Pressure (D) None of these
Last Answer : (A) Enthalpy
Description : If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called (a) free expansion (b) hyperbolic expansion (c) adiabatic expansion (d) parabolic expansion (e) throttling.
Last Answer : Answer : a
Description : A heat exchange process in which the product of pressure and volume remains constant is known as (a) heat exchange process (b) throttling process (c) isentropic process (d) adiabatic process (e) hyperbolic process.
Description : Evaporative cooling process employs a combination of cooling and humidification in which the (A) Sensible heat is added (B) Sensible heat is removed and the latent heat is added (C) Latent heat is removed (D) Sensible heat is added and latent heat is removed
Last Answer : Option B
Description : Gas turbine normally employs a constant __________ cycle. (A) Pressure (B) Temperature (C) Volume (D) None of these
Last Answer : (A) Pressure
Description : The bank of tubes located at the back of the domestic refrigerators are the __________ tubes. (A) Refrigerant cooling (B) Evaporator (C) Condenser (D) Throttling
Last Answer : C) Condenser
Description : Throttling process is a/an __________ process. (A) Reversible and isothermal (B) Irreversible and constant enthalpy (C) Reversible and constant entropy (D) Reversible and constant enthalpy
Last Answer : (B) Irreversible and constant enthalpy
Description : Joule-Thomson effect i.e., a throttling process is a constant __________ process. (A) Entropy (B) Temperature (C) Internal energy (D) Enthalpy
Last Answer : (D) Enthalpy
Description : Domestic refrigerator working on vapour compression cycle uses the following type of expansion device (a) electrically operated throttling valve (b) manually operated valve (c) thermostatic valve (d) capillary tube
Description : In thermodynamics, a throttling process, also called a _________, is a type of isenthalpic process where a liquid or gas is cooled as it passes from a higher pressure state to a lower pressure state. a. Rankine Process b. Carnot Cycle c. Joule-Thomson process d. Refrigeration process
Last Answer : Joule-Thomson process
Description : Pick out the wrong statement: (A) The expansion of a gas in vacuum is an irreversible process (B) An isometric process is a constant pressure process (C) Entropy change for a reversible adiabatic process is zero (D) Free energy change for a spontaneous process is negative
Last Answer : (B) An isometric process is a constant pressure process
Description : Which of the following is not a reversible process? (A) Expansion of an ideal gas against constant pressure (B) Atmospheric pressure vaporisation of water at 100°C (C) Solution of NaCl in water at 50°C (D) None of these
Last Answer : C) Solution of NaCl in water at 50°C
Description : Which of the following employs an accessory known as 'drift eliminator'? (A) Multiple effect evaporator (B) Mechanical draft cooling tower (C) Rotary dryer (D) Rotating disc contacto
Last Answer : (B) Mechanical draft cooling tower
Description : Which parameter remains constant in a throttling process ?
Last Answer : Enthalpy.
Description : __________ decreases during adiabatic throttling of a perfect gas. (A) Entropy (B) Temperature (C) Enthalpy (D) Pressure
Last Answer : (D) Pressure
Description : Joule-Thomson co-efficient is the ratio of (A) Pressure change to temperature change occuring during adiabatic compression of a gas (B) Pressure change to temperature change occuring during adiabatic ... a gas (D) Temperature change to pressure change occuring during adiabatic throttling of a gas
Last Answer : (D) Temperature change to pressure change occuring during adiabatic throttling of a gas
Description : Which one is true for a throttling process? (A) A gas may have more than one inversion temperatures (B) The inversion temperature is different for different gases (C) The inversion ... gases (D) The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity
Last Answer : (B) The inversion temperature is different for different gases
Description : Linde welding uses 1.Neutral flame and rightward technique 2.Carburizing flame and rightward technique 3.Neutral flame and leftward technique 4.Oxidizing flame and leftward technique
Last Answer : Linde welding uses Carburizing flame and rightward technique
Description : Favourable conditions for the liquefaction of gases in general are (A) High pressure & low temperature (B) Low pressure & high temperature (C) High pressure & high temperature (D) Low pressure & low temperature
Last Answer : (A) High pressure & low temperature
Description : Dry ice (solidified CO2 ) is used for the (A) Storage & shipment of frozen foods and ice-creams (B) Liquefaction of permanent gases (C) Liquefaction of natural gas (D) None of these
Last Answer : (A) Storage & shipment of frozen foods and ice-creams
Description : Grams of butane (C4H10 ) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be (A) 580 (B) 640 (C) 1160 (D) Data insufficient; can't be computed
Last Answer : (C) 1160
Description : The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for (A) Expansion of a real gas (B) Reversible isothermal volume change (C) Heating of an ideal gas (D) Cooling of a real gas
Last Answer : (B) Reversible isothermal volume change
Description : The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCvln (T2/T1) is valid for (A) Reversible isothermal volume change (B) Heating of a substance (C) Cooling of a substance (D) Simultaneous heating and expansion of an ideal gas
Last Answer : (D) Simultaneous heating and expansion of an ideal gas
Description : An adiabatic process in which there is no change in system enthalpy but for which there is a significant decrease in pressure is called _____. A. Isochoric process B. Isobaric process C. Throttling process D. Quasistatic process
Last Answer : Throttling process
Description : Air refrigeration cycle is used in (a) domestic refrigerators (b) gas liquefaction (c)commercial refrigerators (d) Chillers
Last Answer : Ans: b
Description : Air refrigeration cycle is used in (a) domestic refrigerators (b) commercial refrigerators (c) air conditioning (d) gas liquefaction
Description : The expression, ∆G = nRT. ln(P2/P1), gives the free energy change (A) With pressure changes at constant temperature (B) Under reversible isothermal volume change (C) During heating of an ideal gas (D) During cooling of an ideal gas
Last Answer : (A) With pressure changes at constant temperature
Description : Zeigler process (A) Produces high density polythene (B) Uses no catalyst (C) Produces low density polythene (D) Employs very high pressure
Last Answer : (A) Produces high density polythene
Description : Low pressure Zeigler process of polythene manufacture (A) Employs a pressure of 30 kgf/cm2 (B) Achieves an yield of 95-98% based on ethylene (C) Produces very low density polythene (D) Does not use any catalyst for polymerisation
Last Answer : (B) Achieves an yield of 95-98% based on ethylene
Description : Zeigler process (A) Produces high density polyethylene (B) Produces low density polyethylene (C) Uses no catalyst (D) Employs very high pressure
Last Answer : (A) Produces high density polyethylene
Description : Which of the following remains constant during sensible cooling process? (A) Specific humidity (B) Partial pressure of vapour (C) Both (A) and (B)
Description : Which of the following remains constant during evaporative cooling process with recirculated water supply? (A) Relative humidity (B) Partial pressure of vapour (C) Wet bulb temperature (D) None of these
Last Answer : (C) Wet bulb temperature
Description : During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains ... pressure of water vapor (C) Relative humidity (D) None of these
Last Answer : (A) Wet bulb temperature
Description : After throttling, gas temperature (A) Decreases (B) Increases (C) Remain same (D) May increase or decrease; depends on the nature of
Last Answer : (A) Decreases