Q#1: Balancing of rotating masses is necessary to:
(A) Reduce vibrations and dynamic loads
(B) Increase mass only
(C) Reduce torque only
(D) Store energy only
Answer: (A) Reduce vibrations and dynamic loads
Q#2: Unbalanced rotating mass causes:
(A) Vibration, noise, bearing wear
(B) Only energy storage
(C) Torque only
(D) Mass only
Answer: (A) Vibration, noise, bearing wear
Q#3: Types of balancing include:
(A) Static and dynamic
(B) Kinetic only
(C) Mass only
(D) Torque only
Answer: (A) Static and dynamic
Q#4: Static balancing is achieved when:
(A) Center of mass lies on axis of rotation
(B) Torque only
(C) Mass only
(D) Energy only
Answer: (A) Center of mass lies on axis of rotation
Q#5: Dynamic balancing is required when:
(A) Rotating mass produces couple due to axial separation
(B) Only torque
(C) Mass only
(D) Energy only
Answer: (A) Rotating mass produces couple due to axial separation
Q#6: In-plane balancing is:
(A) Balancing of masses in same plane
(B) Axial only
(C) Mass only
(D) Torque only
Answer: (A) Balancing of masses in same plane
Q#7: Out-of-plane balancing is:
(A) Balancing of masses in different planes
(B) Single plane
(C) Mass only
(D) Torque only
Answer: (A) Balancing of masses in different planes
Q#8: In static balancing of a single mass:
(A) Mass is placed opposite to existing mass at same radius
(B) Torque only
(C) Mass only
(D) Energy only
Answer: (A) Mass is placed opposite to existing mass at same radius
Q#9: For dynamic balancing of two-plane system:
(A) Two masses are placed in different planes to eliminate couples
(B) Single mass
(C) Mass only
(D) Torque only
Answer: (A) Two masses are placed in different planes to eliminate couples
Q#10: Balancing reduces:
(A) Bearing loads and shaft vibrations
(B) Only torque
(C) Mass only
(D) Energy only
Answer: (A) Bearing loads and shaft vibrations
Q#11: Single-plane balancing is sufficient for:
(A) Short rotors with concentrated masses in one plane
(B) Long shafts
(C) Mass only
(D) Torque only
Answer: (A) Short rotors with concentrated masses in one plane
Q#12: Two-plane balancing is used for:
(A) Long rotors or multi-plane unbalanced rotors
(B) Short shafts
(C) Mass only
(D) Torque only
Answer: (A) Long rotors or multi-plane unbalanced rotors
Q#13: In automobile crankshaft, balancing is:
(A) Both static and dynamic
(B) Only static
(C) Mass only
(D) Torque only
Answer: (A) Both static and dynamic
Q#14: Vibration due to unbalanced mass is proportional to:
(A) Mass × distance from axis × square of speed
(B) Mass only
(C) Torque only
(D) Energy only
Answer: (A) Mass × distance from axis × square of speed
Q#15: Moment of unbalanced mass about axis is:
(A) Product of mass, radius, and angular speed squared
(B) Torque only
(C) Mass only
(D) Energy only
Answer: (A) Product of mass, radius, and angular speed squared
Q#16: Residual unbalance after balancing should be:
(A) Within permissible limits to avoid vibration
(B) Zero always
(C) Mass only
(D) Torque only
Answer: (A) Within permissible limits to avoid vibration
Q#17: Plane of rotation in static balancing:
(A) Perpendicular to axis of rotation
(B) Parallel
(C) Mass only
(D) Torque only
Answer: (A) Perpendicular to axis of rotation
Q#18: For dynamic balancing, masses are distributed:
(A) In multiple planes along shaft
(B) Single plane only
(C) Mass only
(D) Torque only
Answer: (A) In multiple planes along shaft
Q#19: Methods of balancing include:
(A) Graphical, analytical, trial-mass, and influence coefficient methods
(B) Torque only
(C) Mass only
(D) Energy only
Answer: (A) Graphical, analytical, trial-mass, and influence coefficient methods
Q#20: Complete balancing ensures:
(A) Smooth operation, reduced wear, minimal vibration
(B) Only torque transmission
(C) Mass only
(D) Energy storage only
Answer: (A) Smooth operation, reduced wear, minimal vibration