1. Which theory focuses on the assumption that the pressure distribution between two sliding surfaces is uniform?
a) Friction surface theory
b) Uniform pressure theory
c) Wear theory
d) Kinetic friction theory
Answer: b) Uniform pressure theory
Explanation: The uniform pressure theory assumes that the pressure distribution between two sliding surfaces in contact remains constant, leading to consistent frictional behavior across the contact area.
2. In friction clutches, which type relies on frictional contact between two parallel plates?
a) Disk clutch
b) Cone clutch
c) Centrifugal clutch
d) Rope clutch
Answer: a) Disk clutch
Explanation: Disk clutches involve frictional contact between two parallel disks or plates, which engage and disengage to transmit torque.
3. What type of clutch relies on frictional contact between a rotating cone and a mating surface?
a) Disk clutch
b) Plate clutch
c) Cone clutch
d) Centrifugal clutch
Answer: c) Cone clutch
Explanation: Cone clutches utilize frictional contact between a rotating cone and a mating surface to engage and disengage for torque transmission.
4. Which type of brake employs a flexible rope wound around a drum to generate friction?
a) Rope brake
b) Band brake
c) Block brake
d) Expanding brake
Answer: a) Rope brake
Explanation: Rope brakes use a flexible rope wound around a drum, where the tension in the rope generates friction against the drum surface to slow or stop motion.
5. Band brakes are characterized by:
a) Circular frictional contact
b) Linear frictional contact
c) Helical frictional contact
d) Spiral frictional contact
Answer: b) Linear frictional contact
Explanation: Band brakes involve linear frictional contact between a flexible band and a drum or disc, allowing for effective braking action.
6. Internal expanding brakes operate by:
a) Contracting inward upon application
b) Expanding outward upon application
c) Sliding laterally upon application
d) Rotating upon application
Answer: a) Contracting inward upon application
Explanation: Internal expanding brakes work by expanding outward against the inner surface of a drum upon application, increasing friction and providing braking action.
7. Disk brakes utilize frictional contact between:
a) Two rotating disks
b) A disk and a drum
c) A disk and a band
d) A disk and a rope
Answer: b) A disk and a drum
Explanation: Disk brakes employ frictional contact between a rotating disk and a stationary drum to slow or stop motion effectively.
8. Which theory suggests that wear between two sliding surfaces is proportional to the frictional force acting between them?
a) Friction surface theory
b) Uniform pressure theory
c) Wear theory
d) Kinetic friction theory
Answer: c) Wear theory
Explanation: Wear theory proposes that the amount of wear between two sliding surfaces is directly related to the frictional force acting between them.
9. Centrifugal clutches operate based on the principle of:
a) Frictional engagement
b) Magnetic repulsion
c) Gravity
d) Centrifugal force
Answer: d) Centrifugal force
Explanation: Centrifugal clutches engage and disengage based on the centrifugal force generated by the rotation of the clutch components.
10. Which type of clutch is commonly used in vehicles for smooth engagement and disengagement of power transmission?
a) Disk clutch
b) Cone clutch
c) Centrifugal clutch
d) Plate clutch
Answer: a) Disk clutch
Explanation: Disk clutches are often preferred in vehicles due to their smooth engagement and disengagement characteristics, making them suitable for various driving conditions.