Q1: Air refrigeration system ka main working fluid hota hai:
(A) Air
(B) Refrigerant R-134a
(C) Ammonia
(D) Water
Answer: (A) Air
Q2: Air refrigeration systems commonly use hote hain:
(A) Aircrafts aur aerospace applications
(B) Domestic refrigerators
(C) Industrial ammonia plants
(D) None
Answer: (A) Aircrafts aur aerospace applications
Q3: Main components of an air refrigeration system include:
(A) Compressor, Expander (or turbine), Heat exchangers
(B) Generator, Absorber, Pump
(C) Compressor, Condenser, Expansion valve, Evaporator
(D) None
Answer: (A) Compressor, Expander (or turbine), Heat exchangers
Q4: Air refrigeration system ka kaam hota hai:
(A) Compressed air ko expand karke low temperature generate karna
(B) Refrigerant vapor condense karna
(C) Only heat rejection
(D) None
Answer: (A) Compressed air ko expand karke low temperature generate karna
Q5: Simple air refrigeration cycle ko kaun sa cycle represent karta hai:
(A) Bell-Coleman cycle (reverse Brayton cycle)
(B) Carnot cycle
(C) Vapor compression cycle
(D) None
Answer: (A) Bell-Coleman cycle (reverse Brayton cycle)
Q6: Air refrigeration system me heat absorb karne ka device hota hai:
(A) Evaporator (cooling chamber)
(B) Condenser
(C) Generator
(D) None
Answer: (A) Evaporator (cooling chamber)
Q7: Air refrigeration system me heat reject karne ka device hota hai:
(A) Heat exchanger (condenser or cooler)
(B) Evaporator
(C) Generator
(D) None
Answer: (A) Heat exchanger (condenser or cooler)
Q8: Air refrigeration cycle me work input provide karta hai:
(A) Compressor
(B) Expander
(C) Evaporator
(D) None
Answer: (A) Compressor
Q9: Expander ka main function hota hai:
(A) Compressed air ko expand karke temperature reduce karna aur work recover karna
(B) Compress karna
(C) Condense karna
(D) None
Answer: (A) Compressed air ko expand karke temperature reduce karna aur work recover karna
Q10: COP (Coefficient of Performance) ka formula air refrigeration system ke liye:
(A) COP = Refrigeration effect / Work input
(B) COP = Work input / Refrigeration effect
(C) COP = Heat rejected / Work input
(D) None
Answer: (A) COP = Refrigeration effect / Work input
Q11: Maximum COP of an ideal air refrigeration system depend karta hai:
(A) Temperature of heat source and heat sink
(B) Only air pressure
(C) Expansion ratio only
(D) None
Answer: (A) Temperature of heat source and heat sink
Q12: Air refrigeration systems ka efficiency improve hoti hai by:
(A) Regeneration (using heat exchanger)
(B) Increasing compressor size only
(C) Reducing evaporator temperature only
(D) None
Answer: (A) Regeneration (using heat exchanger)
Q13: Regenerator ka function hota hai:
(A) Pre-cool compressed air using cold air from expander
(B) Heat the compressed air
(C) Absorb refrigerant
(D) None
Answer: (A) Pre-cool compressed air using cold air from expander
Q14: Ideal air refrigeration cycle assume karta hai:
(A) Air behaves as ideal gas
(B) Air behaves as real gas
(C) Refrigerant used
(D) None
Answer: (A) Air behaves as ideal gas
Q15: Bell-Coleman cycle me work ratio ka formula hai:
(A) W_net / Q_in
(B) Q_in / W_net
(C) Q_out / W_net
(D) None
Answer: (A) W_net / Q_in
Q16: Advantages of air refrigeration systems include:
(A) Simple, safe, no toxic refrigerant, suitable for high-altitude applications
(B) Low COP
(C) High initial cost
(D) None
Answer: (A) Simple, safe, no toxic refrigerant, suitable for high-altitude applications
Q17: Limitations of air refrigeration systems include:
(A) Large size, low COP compared to vapor compression system
(B) High toxicity
(C) Only domestic use
(D) None
Answer: (A) Large size, low COP compared to vapor compression system
Q18: Air refrigeration system ka main application temperature range hota hai:
(A) 0°C to -50°C (approx, aircraft and industrial cooling)
(B) 20°C to 40°C only
(C) Above 100°C only
(D) None
Answer: (A) 0°C to -50°C (approx, aircraft and industrial cooling)
Q19: Air refrigeration system ke liye ideal gas law use hoti hai:
(A) PV = nRT
(B) Q = m·c·ΔT
(C) Fourier’s law
(D) None
Answer: (A) PV = nRT
Q20: Air refrigeration systems ka main component for work recovery hota hai:
(A) Expander / Turbine
(B) Compressor
(C) Condenser
(D) None
Answer: (A) Expander / Turbine