Q#1: The primary function of a bearing is to:
(A) Support a shaft and reduce friction between moving parts
(B) Store energy
(C) Transmit torque only
(D) Only resist axial loads
Answer: (A) Support a shaft and reduce friction between moving parts
Q#2: Common types of bearings include:
(A) Plain (sliding) bearings and rolling element (ball, roller) bearings
(B) Only ball bearings
(C) Only plain bearings
(D) Mass only
Answer: (A) Plain (sliding) bearings and rolling element (ball, roller) bearings
Q#3: A ball bearing is mainly used to:
(A) Support radial and moderate axial loads with low friction
(B) Only compressive loads
(C) Only torsion
(D) Mass only
Answer: (A) Support radial and moderate axial loads with low friction
Q#4: Roller bearings are suitable for:
(A) Heavy radial loads
(B) Only light axial loads
(C) Torque only
(D) Mass only
Answer: (A) Heavy radial loads
Q#5: Thrust bearings are designed to:
(A) Support axial loads
(B) Only radial loads
(C) Only torque
(D) Mass only
Answer: (A) Support axial loads
Q#6: Bearings are usually made from:
(A) High-carbon chromium steel, sometimes with bronze or polymer inserts
(B) Aluminum only
(C) Plastic only
(D) Mass only
Answer: (A) High-carbon chromium steel, sometimes with bronze or polymer inserts
Q#7: Bearing life is defined as:
(A) The number of revolutions or hours at which 90% of bearings survive under rated load
(B) Only time to failure
(C) Only rotations
(D) Mass only
Answer: (A) The number of revolutions or hours at which 90% of bearings survive under rated load
Q#8: Dynamic load rating of a bearing represents:
(A) Load under which bearing can achieve rated life
(B) Maximum static load
(C) Only mass
(D) Torque only
Answer: (A) Load under which bearing can achieve rated life
Q#9: Static load rating of a bearing represents:
(A) Maximum load the bearing can withstand without permanent deformation
(B) Load for rated life
(C) Mass only
(D) Torque only
Answer: (A) Maximum load the bearing can withstand without permanent deformation
Q#10: Factor of safety in bearing design is applied to:
(A) Static and dynamic loads to prevent premature failure
(B) Only torque
(C) Mass only
(D) Only friction
Answer: (A) Static and dynamic loads to prevent premature failure
Q#11: Bearing selection depends on:
(A) Load type, magnitude, speed, lubrication, alignment, and environment
(B) Only mass
(C) Only color
(D) Only torque
Answer: (A) Load type, magnitude, speed, lubrication, alignment, and environment
Q#12: Lubrication in bearings is used to:
(A) Reduce friction, wear, and heat generation
(B) Only increase life
(C) Mass only
(D) Torque only
Answer: (A) Reduce friction, wear, and heat generation
Q#13: A deep groove ball bearing can carry:
(A) Radial loads and moderate thrust loads in both directions
(B) Only axial load
(C) Only radial load
(D) Mass only
Answer: (A) Radial loads and moderate thrust loads in both directions
Q#14: Cylindrical roller bearings are suitable for:
(A) Heavy radial loads, limited axial load
(B) Only axial loads
(C) Only torque
(D) Mass only
Answer: (A) Heavy radial loads, limited axial load
Q#15: Spherical roller bearings can accommodate:
(A) Misalignment between shaft and housing
(B) Only torque
(C) Only axial loads
(D) Mass only
Answer: (A) Misalignment between shaft and housing
Q#16: Bearing life can be improved by:
(A) Proper lubrication, material selection, and correct preload
(B) Only mass reduction
(C) Only torque reduction
(D) Only appearance
Answer: (A) Proper lubrication, material selection, and correct preload
Q#17: Preloading a bearing is used to:
(A) Remove clearance, increase stiffness, and reduce vibration
(B) Only torque
(C) Mass only
(D) Only for alignment
Answer: (A) Remove clearance, increase stiffness, and reduce vibration
Q#18: Bearing failure can occur due to:
(A) Fatigue, wear, corrosion, misalignment, or improper lubrication
(B) Only mass
(C) Only torque
(D) Color only
Answer: (A) Fatigue, wear, corrosion, misalignment, or improper lubrication
Q#19: Rolling element bearings reduce friction because:
(A) Rolling friction is much lower than sliding friction
(B) They are lubricated only
(C) Only mass
(D) Torque only
Answer: (A) Rolling friction is much lower than sliding friction
Q#20: Selection of bearing type and size considers:
(A) Load, speed, accuracy, life, stiffness, and environment
(B) Only torque
(C) Only mass
(D) Only material
Answer: (A) Load, speed, accuracy, life, stiffness, and environment