AP ECET MECHANICAL ENGINEERING Multiple Choice Questions (MCQs)

31. Which of the following is a destructive testing method for materials?

• A) X-ray inspection
• B) Hardness test
• C) Tensile test
• D) Ultrasonic testing

Answer: C) Tensile test

32. The Iron-Carbon equilibrium diagram is used to determine the composition of:

• A) Ferrous metals
• B) Non-ferrous metals
• C) Alloys
• D) Heat treatment processes

Answer: A) Ferrous metals

33. What is the main purpose of heat treatment processes for steel?

• A) To improve appearance
• B) To improve mechanical properties
• C) To reduce manufacturing cost
• D) To increase the weight

Answer: B) To improve mechanical properties

34. Which of the following is an example of a non-ferrous metal?

• A) Steel
• B) Aluminum
• C) Cast Iron
• D) Stainless steel

Answer: B) Aluminum

35. In the context of stress and strain, what is strain energy?

• A) Energy stored in a material due to deformation
• B) Energy required to fracture a material
• C) Energy released during fracture
• D) Energy needed to heat the material

Answer: A) Energy stored in a material due to deformation

36. Which of the following materials is most commonly used for manufacturing machine components due to its high strength and hardness?

• A) Aluminum
• B) Copper
• C) Steel
• D) Zinc

Answer: C) Steel

37. The relationship between stress and strain for a material is defined by:

• A) Hooke’s Law
• B) Bernoulli's Principle
• C) Newton’s Law
• D) Faraday’s Law

Answer: A) Hooke’s Law

38. Shear force and bending moment diagrams are used to determine the:

• A) Velocity of the material
• B) Deformation of the material
• C) Internal forces within beams and structures
• D) Surface roughness of the material

Answer: C) Internal forces within beams and structures

39. In the Iron-Carbon diagram, the composition of 0.8% carbon corresponds to:

• A) Ferrite
• B) Cementite
• C) Pearlite
• D) Austenite

Answer: C) Pearlite

40. Which of the following is a method of non-destructive testing?

• A) Tensile test
• B) Hardness test
• C) Ultrasonic test
• D) Impact test

Answer: C) Ultrasonic test

41. What does the term “bending moment” refer to in beam theory?

• A) The force applied to the beam
• B) The deformation of the beam
• C) The moment that causes the beam to bend
• D) The torque on the beam

Answer: C) The moment that causes the beam to bend

42. Which of the following materials is commonly used for making gears due to its good wear resistance?

• A) Cast Iron
• B) Copper
• C) Aluminum
• D) Steel

Answer: D) Steel

43. The deflection of beams is influenced by:

• A) The material's Young's Modulus
• B) The temperature of the material
• C) The shape of the beam only
• D) The weight of the beam

Answer: A) The material's Young's Modulus

44. Which of the following is NOT a factor influencing the production of iron and steel?

• A) Ore quality
• B) Carbon content
• C) Amount of alloying elements
• D) Grain structure

Answer: D) Grain structure

45. Torsion in shafts is mainly caused by:

• A) Compressive forces
• B) Tensile forces
• C) Rotational forces
• D) Shear forces

Answer: C) Rotational forces