41. The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as
hot piercing
extrusion
cold peening
cold heading
✅ The correct answer is option C.
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.
42. Braking jet in an impulse turbine is used
to break the jet of water
to bring the runner to rest in a short time
to change the direction of runner
none of these
✅ The correct answer is option B.
43. Which of the following spring is used in mechanical wrist watch?
Helical compression spring
Spiral spring
Torsion spring
Bellevile spring
✅ The correct answer is option C.
44. The power actually developed inside the engine cylinder is called as
indicated power
brake power
frictional power
none of these
✅ The correct answer is option A.
45. A nozzle is said to be a convergent-divergent nozzle, when the cross-section of a nozzle first decreases from its entrance to throat and then increases from its throat to exit.
TRUE
FALSE
✅ The correct answer is option A.
46. Select the wrong statement
A Joule cycle consists of two constant volume and two isentropic processes.
An Otto cycle consists of two constant volume and two isentropic processes.
An Ericsson cycle consists of two constant pressure and two isothermal processes.
all of the above
✅ The correct answer is option A.
47. An oxidising flame is obtained when equal volumes of oxygen and acetylene are supplied.
TRUE
FALSE
✅ The correct answer is option B.
48. The length of Lancashire boiler varies from
5 to 6 m
6 to 7 m
7.25 to 9 m
9 to 10 m
✅ The correct answer is option C.
50. Normalising of steel is done to
refine the grain structure
remove strains caused by cold working
remove dislocations caused in the internal structuure due to hot working
all of the above
✅ The correct answer is option D.