Mechanical Engineering

Prepare with the best Mechanical Engineering MCQs with answers and explanations for exams, interviews, and job tests. Our collection covers core topics such as engineering mechanics, thermodynamics, strength of materials, theory of machines, fluid mechanics, heat transfer, manufacturing processes, machine design, and power plant engineering. These Mechanical Engineering multiple-choice questions are designed for students, fresh graduates, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and recruitment assessments. Strengthen your technical knowledge and problem-solving ability with our updated and comprehensive Mechanical Engineering MCQs.

📘 Automobile Engineering MCQs
📘 Compressors, Gas Dynamics and Gas Turbines MCQs
📘 Engineering Materials MCQs
📘 Engineering Mechanics MCQs
📘 Heat Transfer, Refrigeration and Air Conditioning MCQs
📘 Hydraulic Machines MCQs
📘 Hydraulics and Fluid Mechanics MCQs
📘 IC Engines and Nuclear Power Plants MCQs
📘 Industrial Engineering and Production Management MCQs
📘 Machine Design MCQs
📘 Production Engineering MCQs
📘 Steam Boilers and Engines MCQs
📘 Steam Nozzles and Turbines MCQs
📘 Strength of Materials MCQs
📘 Theory of machines MCQs
📘 Thermodynamics MCQs
📘 topics MCQs
📘 Workshop Technology MCQs

131. In air compressors, free air delivery means the

actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
volume of air delivered by the compressor
volume of air sucked by the compressor during its suction stroke
none of the above
✅ The correct answer is option A.

133. The use of heat exchangers is made in

radiators in automobile
condensers and boilers in steam plants
condensers and evaporators in refrigeration and air conditioning units
all of the above
✅ The correct answer is option D.

138. The nozzle efficiency is the ratio of

workdone on the blades to the energy supplied to the blades
workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
none of the above
✅ The correct answer is option C.