Mechanical Engineering MCQs

41. What is the primary source of energy for Earth's climate system?
A. Geothermal
B. Solar
C. Nuclear
D. Wind
42. Which type of bearing is used to handle both radial and axial loads?
A. Ball bearing
B. Roller bearing
C. Thrust bearing
D. Tapered roller bearing
43. What is the purpose of a differential in a vehicle?
A. To increase speed
B. To allow wheels to rotate at different speeds
C. To reduce friction
D. To store energy
44. Which of the following is a type of non-destructive testing?
A. Tensile testing
B. Ultrasonic testing
C. Hardness testing
D. Impact testing
45. What is the primary function of a camshaft in an engine?
A. To regulate fuel flow
B. To control valve timing
C. To increase torque
D. To reduce emissions
46. Which type of fit allows for slight movement between mating parts?
A. Interference fit
B. Clearance fit
C. Transition fit
D. Force fit
47. What is the primary purpose of a muffler in a vehicle?
A. To increase power
B. To reduce noise
C. To cool the engine
D. To filter air
48. Which of the following is a property of a Newtonian fluid?
A. Constant viscosity
B. Variable viscosity
C. No viscosity
D. High compressibility
49. What is the primary purpose of a supercharger in an engine?
A. To increase fuel efficiency
B. To increase air intake
C. To reduce emissions
D. To cool the engine
50. Which of the following is a type of heat treatment process?
A. Forging
B. Annealing
C. Extrusion
D. Casting