MCQ STEAM JET REFRIGERATION

 

MCQ STEAM JET

REFRIGERATION

MCQ increases clarity and understanding.

It is applied where steam is available. It is

vibration free. This is economical as

compared to other systems of

refrigeration.

  1. Number of nozzles in Steam Jet Refrigeration is

  1. Two

  2. Four

  3. Six

  4. None

ANS: (d)

  1. Number of nozzles in Steam Jet Refrigeration is

  1. Two

  2. One

  3. Three

  4. None

ANS: (b)

  1. Type of nozzle used in Steam Jet Refrigeration is

  1. Convergent

  2. Convergent-divergent

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. Pressure of steam after the nozzle is

  1. High vacuum

  2. Low vacuum

  3. No vacuum

  4. None

ANS: (b)

  1. The temperature of condensed steam in the condenser is

  1. 1000C

  2. 400C

  3. 100C

  4. None

ANS: (b)

  1. Primary refrigerant used in steam jet refrigeration is

  1. Steam

  2. Water

  3. Air

  4. None

ANS: (b)

  1. Secondary refrigerant used in steam jet refrigeration is

  1. Steam

  2. Water

  3. Air

  4. None

ANS: (c)

  1. The temperature of water in the flash chamber is

  1. 400C

  2. 200C

  3. 50C

  4. None

ANS: (c )

  1. The expansion process in the nozzle is

  1. Isothermal

  2. Isentropic

  3. Isobaric

  4. None

ANS: (d)

  1. The expansion process in the nozzle is

  1. Adiabatic

  2. Isentropic

  3. Isometric

  4. None

ANS: (a)

  1. The efficiency of nozzle is

  1. Actual pressure drop/Theoretical pressure drop

  2. Theoretical pressure drop/actual pressure drop

  3. Both (a) & (b)

  4. None

ANS: (d)

  1. The efficiency of nozzle is

  1. Actual enthalpy drop/Theoretical enthalpy drop

  2. Theoretical enthalpy drop/actual enthalpy drop

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. Diffuser efficiency is The efficiency of nozzle is

  1. Actual pressure rise/Theoretical pressure rise

  2. Theoretical pressure rise/actual pressure rise

  3. Both (a) & (b)

  4. None

ANS: (d)

  1. The efficiency of diffuser is

  1. Actual enthalpy rise/Theoretical enthalpy rise

  2. Theoretical enthalpy rise/actual enthalpy rise

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. Pressure in the condenser is

  1. Above atmospheric

  2. Equal to atmospheric

  3. Less than atmospheric

  4. None

ANS: (c )

 

  1. Cooling effect produced in steam jet refrigeration is by

  1. Sensible effect

  2. Latent effect

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. Cooling effect in steam jet refrigeration is

  1. Firstly              h water in flash chamber—h water in condenser

  2. Secondly         h water in condenser—h water in flash chamber

  3. Thirdly            h water in condenser+ h water in flash chamber

  4. None

ANS: (b)

  1. Pressure of steam required in steam refrigeration is

  1. 3 bars

  2. 5 bars

  3. 7 bars

  4. None

ANS: (c)

  1. Vapors flashes in the flash chamber due to

  1. High pressure

  2. Low pressure

  3. Vacuum

  4. None

ANS: (c )

  1. Water in the flash chamber is chilled water as its temperature is

  1. 0-50C

  2. 5-90C

  3. 9-130C

  4. None

ANS: (b)

  1. Pressure ratio is

  1. Firstly         P steam/p flash chamber

  2. Secondly   P flash chamber/p condenser

  3. Thirdly      P condenser/p flash chamber

  4. None

ANS: (c )

  1. Which part is acting as compressor

  1. Nozzle

  2. Diffuser

  3. Flash chamber

  4. None

ANS: (b)

  1. Pressure reduction ratio in the nozzle is

  1. 500-600

  2. 600-700

  3. 700-800

  4. None

ANS: (c )

  1. Volume handled is

  1. 500-600 times than in vapor compression

  2. 600-700 times than in vapor compression

  3. 700-800 times than in vapor compression

  4. None

ANS: ( c)

     25. Steam vapors follow

·        (a) Perfect gas equation
(b) Boyle’s Law
(c) Charles Law
(d) None
(Ans: d)

       26.The mass of steam required required per kg of water vapor removed from the flash chamber in a steam jet refrigeration system is

·        (a) < 1 kg

  • (b) = 1 kg
  • (c) > 1 kg
  • (d) None
  • (Ans: c)

 

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