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AP ECET MECHANICAL ENGINEERING Multiple Choice Questions (MCQs)

AP ECET Mechanical Engineering - Unit VIII MCQs

106. Which of the following is a method of refrigeration?

a) Compression refrigeration
b) Evaporative refrigeration
c) Absorption refrigeration
d) All of the above

Answer: d) All of the above

107. In a vapor compression refrigeration cycle, the refrigerant undergoes:

a) Isentropic compression
b) Isobaric expansion
c) Adiabatic compression
d) Isothermal expansion

Answer: a) Isentropic compression

108. What is the primary purpose of the condenser in a refrigeration cycle?

a) To compress the refrigerant
b) To absorb heat from the refrigerant
c) To vaporize the refrigerant
d) To expand the refrigerant

Answer: b) To absorb heat from the refrigerant

109. Which of the following is used in the vapor absorption refrigeration system as an absorbent?

a) Water
b) Ammonia
c) Lithium bromide
d) Freon

Answer: c) Lithium bromide

110. The refrigeration cycle that uses a low-pressure liquid to absorb heat from the surroundings is called:

a) Vapor compression cycle
b) Absorption cycle
c) Reverse Carnot cycle
d) Joule cycle

Answer: b) Absorption cycle

111. Which of the following equipment is typically used in a vapor compression refrigeration system?

a) Absorber
b) Evaporator
c) Generator
d) Condenser

Answer: b) Evaporator

112. In a vapor compression refrigeration system, the refrigerant is compressed in the:

a) Evaporator
b) Condenser
c) Compressor
d) Expansion valve

Answer: c) Compressor

113. Which of the following refrigerants is commonly used in domestic refrigeration systems?

a) R-12
b) R-22
c) R-134a
d) Ammonia

Answer: c) R-134a

114. In an air conditioning system, which of the following is responsible for controlling humidity?

a) Compressor
b) Expansion valve
c) Evaporator coil
d) Dehumidifier

Answer: d) Dehumidifier

115. Which of the following is a property of air that is important in air conditioning?

a) Specific volume
b) Humidity
c) Dry bulb temperature
d) All of the above

Answer: d) All of the above

116. Which cycle is commonly used in air conditioning systems?

a) Rankine cycle
b) Joule cycle
c) Carnot cycle
d) Vapor compression cycle

Answer: d) Vapor compression cycle

117. The process of cooling air by evaporating water to lower the air temperature is called:

a) Refrigeration
b) Air humidification
c) Air cooling
d) Evaporative cooling

Answer: d) Evaporative cooling

118. The psychrometric chart is used to analyze:

a) The performance of refrigerants
b) The temperature and humidity conditions of air
c) The efficiency of the condenser
d) The heat transfer rate in the evaporator

Answer: b) The temperature and humidity conditions of air

119. Which of the following is a primary application of air conditioning?

a) Refrigeration of food
b) Maintaining comfort in buildings
c) Generating electricity
d) Controlling humidity in industrial processes

Answer: b) Maintaining comfort in buildings

120. What is the key advantage of the vapor absorption refrigeration system over the vapor compression system?

a) Higher efficiency
b) Requires less power input
c) More compact design
d) Lower operating cost

Answer: b) Requires less power input

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