Mechanical Engineering MCQs
Mechanical Engineering MCQs are a crucial resource for students and job seekers preparing for competitive tests in Pakistan. This section features MCQs from all major areas including thermodynamics, fluid mechanics, machine design, manufacturing processes, engineering materials, and mechanics of solids. These questions are crafted to meet the standards of exams like PPSC, FPSC, NTS, and university entry or semester tests. Each MCQ is aimed at testing your fundamental understanding and problem-solving ability, making them perfect for both fresh graduates and experienced professionals. With a wide range of topics, this category ensures a comprehensive practice session for anyone looking to ace Mechanical Engineering exams.
Q: Internal energy of a system increases when heat is added at constant volume
A) No temperature change
B) All the above
C) Work done by system
D) No heat transfer
Q: Steam turbines are preferred over gas turbines for
A) High initial cost
B) Constant load conditions
C) Low pressure application
D) Quick start-up
Q: The ratio of specific heats (ฮณ = Cp/Cv) for air is nearly
A) 1.0
B) 1.4
C) 1.33
D) 1.67
Q: Rankine cycle efficiency increases when
A) Boiler pressure is reduced
B) Condenser pressure is increased
C) Superheating is done
D) Feedwater is cooled
Q: Hardness of a material is its ability to
A) Resist deformation
B) Resist wear and abrasion
C) Break easily
D) Withstand impact
Q: When two gears are meshed, the smaller is called
A) Driver
B) Pinion
C) Rack
D) Sprocket
Q: Otto cycle is used in
A) Steam turbines
B) Diesel engines
C) Jet engines
D) Gasoline engines
Q: Materials are tempered after hardening to
A) Increase hardness
B) Improve elasticity
C) Induce stress
D) Reduce brittleness
Q: The efficiency of a Carnot engine depends on
A) Working fluid
B) Pressure ratio
C) Temperature difference
D) Volume ratio
Q: The Reynolds number is used to predict
A) Fluid density
B) Flow regime
C) Heat transfer
D) Pipe diameter