Mechanical Engineering MCQs
Mechanical Engineering MCQs for competitive exams in Pakistan cover thermodynamics, fluid mechanics, machine design, manufacturing, and materials. Ideal for PPSC, FPSC, NTS, and university tests, they help students and professionals enhance concepts and problem-solving skills.
Q: Centrifugal pumps are most efficient at which condition?
A) Minimum speed
B) Designed operating point
C) Shut-off head
D) Maximum flow rate
Q: How does the Reynolds number influence flow characteristics?
A) Maintains uniform velocity
B) Determines laminar or turbulent
C) Increases pipe length
D) Controls pressure drop
Q: In gas welding, which flame is ideal for welding low carbon steel?
A) Cutting flame
B) Neutral flame
C) Oxidizing flame
D) Carburizing flame
Q: Why are heat exchangers used in power plants?
A) For combustion
B) For energy recovery
C) For vibration control
D) For noise reduction
Q: Brinell hardness test uses which type of indenter?
A) Hardened steel ball
B) Diamond cone
C) Tungsten blade
D) Square punch