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: Crankshaft converts
A) Heat to work
B) Rotary to linear motion
C) Linear to rotary motion
D) Work to heat
✅ Correct Answer: C
Explanation: The crankshaft transforms the piston’s linear motion into rotary motion.
Q: Brinell hardness test uses
A) A steel ball
B) A diamond pyramid
C) A flat punch
D) An indenter
✅ Correct Answer: A
Explanation: Brinell test uses a hardened steel or tungsten carbide ball to make an indentation.
Q: Shear force in a beam is maximum at
A) Mid-span
B) Neutral axis
C) Free end
D) Fixed end
✅ Correct Answer: D
Explanation: In a cantilever or fixed beam, shear is maximum at the support or fixed end.
Q: Tensile test is used to determine
A) Elongation
B) Fracture toughness
C) Modulus of rigidity
D) Impact strength
✅ Correct Answer: A
Explanation: A tensile test provides information about ductility and elongation.
Q: In IC engines, knocking occurs due to
A) Early ignition
B) Late ignition
C) Carburetion
D) Detonation
✅ Correct Answer: D
Explanation: Knocking is caused by premature combustion of fuel-air mixture, known as detonation.