GuruMCQs.com provides all updated Mechanical Engineering Multiple Choice Questions (MCQs). The most frequently repeated mechanical MCQs section is frequently encountered in FPSC, PPSC, ETEA, NTS, Army, Navy, Air Force, educators, and various other competitive exams, as well as government and private job assessments. Most repeated mechanical engineering MCQs cover topics like Engineering Materials, Fluid Mechanics, Hydraulic Machines, Machine Design, Engineering Mechanics, Nuclear Power Plants, Steam Boilers, Engines, Nozzles, Turbines, Compressors, Gas Turbines, Jet Engines, Thermodynamics, Engineering Metrology, Heat Transfer, etc. Preparing with these MCQs can significantly contribute to your success in government job exams and interviews. Whether you are aiming to establish a career in engineering or seeking to enhance your existing skills, the Mechanical Engineering MCQs at www.gurumcqs.com serve as a valuable resource. Stay committed to regular practice and empower yourself with the knowledge needed to excel in your academic and professional endeavors.

**161. One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice:**
– A. in 1 hour
– B. in 1 minute
– **C. in 24 hours**
– D. in 12 hours
– E. in 10 hours

**162. Critical temperature is the temperature above which:**
– **A. a gas will never liquefy**
– B. a gas will immediately liquefy
– C. water will evaporate
– D. water will never evaporate
– E. none of the above

**163. The COP of a domestic refrigerator:**
– A. is less than 1
– **B. is more than 1**
– C. is equal to 1
– D. depends upon the make
– E. depends upon the weather conditions

**164. Presence of moisture in a refrigerant affects the working of:**
– A. compressor
– B. condenser
– C. evaporator
– **D. expansion valve**
– E. heat transfer

**165. 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**
– E. expansion valve

**166. The domestic refrigerator uses following type of compressor:**
– A. centrifugal
– B. axial
– **C. miniature sealed unit**
– D. piston type reciprocating
– E. none of the above

**167. The refrigerant for a refrigerator should have:**
– A. high sensible heat
– B. high total heat
– **C. high latent heat**
– D. low latent heat
– E. low sensible heat

**168. Rating of a domestic refrigerator is of the order of:**
– **A. 0.1 ton**
– B. 5 tons
– C. 10 tons
– D. 40 tons
– E. 100 tons

**169. Refrigeration in aeroplanes usually employs the following refrigerant:**
– A. CO2
– B. Freon-11
– C. Freon-22
– **D. Air**
– E. none of the above

**170. Air refrigeration operates on:**
– A. Carnot cycle
– B. Reversed Carnot cycle
– C. Rankine cycle
– D. Ericsson cycle
– **E. Brayton cycle**