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: Mohr’s circle is used to determine
A) Shear and normal stresses
B) Torque
C) Stress concentration
D) Moments
✅ Correct Answer: A
Explanation: Mohr’s circle graphically represents stress transformations.
Q: Euler’s formula is used to calculate
A) Stress
B) Buckling load
C) Bending moment
D) Heat loss
✅ Correct Answer: B
Explanation: Euler's formula gives critical buckling load for long slender columns.
Q: Welding process involving non-consumable electrode is
A) Resistance welding
B) MIG
C) TIG
D) Arc welding
✅ Correct Answer: C
Explanation: TIG uses a non-consumable tungsten electrode for welding.
Q: In reciprocating compressors, clearance volume is necessary to
A) Prevent fluid leakage
B) Avoid piston striking
C) Reduce friction
D) Avoid knocking
✅ Correct Answer: B
Explanation: Clearance prevents mechanical contact between piston and cylinder head.
Q: The main function of lubricating oil is to
A) Increase temperature
B) Clean components
C) Decrease power
D) Reduce wear
✅ Correct Answer: D
Explanation: Lubrication reduces friction and wear between moving parts.