AP ECET MECHANICAL ENGINEERING Multiple Choice Questions (MCQs)
AP ECET Mechanical Engineering - Unit IV: Theory of Machines and Design of Machine Elements (MCQs)
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Which of the following is a primary factor in determining the velocity ratio in a belt drive system?
- A) Pulley diameter
- B) Belt material
- C) Pulley speed
- D) Belt thickness
Answer: A) Pulley diameter
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The centrifugal tension in a belt drive system depends on:
- A) Speed of the driving pulley
- B) Radius of the pulley
- C) Length of the belt
- D) All of the above
Answer: D) All of the above
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In a belt drive, the power transmitted by the belt increases as the:
- A) Tension on the driving side decreases
- B) Tension on the driven side increases
- C) Belt length decreases
- D) Pulley speed decreases
Answer: B) Tension on the driven side increases
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The slip in a belt drive refers to:
- A) The difference in the velocities of the driving and driven pulleys
- B) The tendency of the belt to slip over the pulleys
- C) The wear and tear of the belt
- D) The friction between the belt and pulley
Answer: B) The tendency of the belt to slip over the pulleys
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Which of the following is an advantage of cross-belt arrangement over open-belt arrangement?
- A) Higher power transmission capacity
- B) Greater belt speed
- C) Reduced wear and tear
- D) Lesser slip
Answer: A) Higher power transmission capacity
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Which of the following gear trains is used when the speed ratio is to be constant?
- A) Simple gear train
- B) Compound gear train
- C) Epicyclic gear train
- D) None of the above
Answer: C) Epicyclic gear train
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What is the function of a flywheel in a mechanical system?
- A) To store rotational energy
- B) To increase torque
- C) To reduce vibrations
- D) To decrease load on the system
Answer: A) To store rotational energy
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Which type of chain drive is commonly used in applications requiring high speeds?
- A) Roller chain
- B) Silent chain
- C) V-belt drive
- D) Gear drive
Answer: B) Silent chain
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The main advantage of a governor in an engine is to:
- A) Maintain a constant speed
- B) Reduce vibrations
- C) Control exhaust gases
- D) Increase power output
Answer: A) Maintain a constant speed
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Which of the following joints is used to connect two components permanently without the use of nuts or bolts?
- A) Bolted joint
- B) Riveted joint
- C) Welded joint
- D) Keyed joint
Answer: B) Riveted joint
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Which of the following factors is most important when designing bolted joints?
- A) Material strength
- B) Bolt diameter
- C) Torque applied
- D) Joint stiffness
Answer: B) Bolt diameter
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In the design of shafts, which of the following is used to transmit torque?
- A) Bearings
- B) Keys
- C) Rivets
- D) Bolts
Answer: B) Keys
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Which type of bearing is suitable for heavy radial loads and high speeds?
- A) Ball bearing
- B) Roller bearing
- C) Sleeve bearing
- D) Needle bearing
Answer: A) Ball bearing
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The primary function of a spring in a machine element is to:
- A) Support axial loads
- B) Absorb shock or vibration
- C) Provide a turning moment
- D) Transmit force between parts
Answer: B) Absorb shock or vibration
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Which of the following is true for welded joints in machine design?
- A) They are less strong than bolted joints
- B) They can only be used for thin materials
- C) They provide a permanent and strong connection
- D) They are easier to disassemble than bolted joints
Answer: C) They provide a permanent and strong connection
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