Indian Standards (I.S.) specify a total of this many tolerance grades__________________?
Show answer Hide answer
Answer: A. 18
Explanation
Indian Standards specify a standardized system comprising a total of 18 grades of tolerances for industrial fits. These standard tolerance grades range from IT01 and IT0 through IT1 through IT16 for various precision levels. Each grade groups manufacturing tolerance bands based on nominal size steps to ensure uniform quality control. Tolerance grades define the magnitude of the allowable variation permitted around basic nominal dimensions. High precision grades like IT01 are used for gauge blocks, while higher grades suit rougher machining operations. Standardized tolerance systems facilitate global manufacturing interchangeability of precision mechanical parts.
Mechanical engineering drawings reference IS tolerance grades to communicate required machining accuracy clearly to shops. Quality inspectors use standardized tolerance grades to determine whether manufactured parts pass inspection limits. Manufacturing industries rely on these numerical grades to specify clearance, transition, and interference fits. Options B, C, D, and E propose incorrect numbers of tolerance grades that do not match Indian Standard specifications. Failing to recognize the 18 standard grades would lead to discrepancies in industrial interchangeability standards. The IS system specifically defines 18 distinct grades to cover all ranges of precision manufacturing requirements.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. The spring form coefficient represents_____________________?
Show answer Hide answer
Answer: C. its capability of storing energy
The spring form coefficient relates directly to a mechanical spring's geometric parameters and energy storage. It mathematically describes the spring ability to absorb and store potential energy under applied loads. Spri...
Q2. Applying load W instantaneously to a bar induces a stress equal to___________________?
Show answer Hide answer
Answer: A. be independent of ratio of mass of load W to mass of bar (y)
Instantaneous load application generates dynamic stress equivalent to twice the static loading condition. The resulting stress magnitude depends entirely on stiffness and deflection rather than mass ratios. Mass of the s...
Q3. Fibrous fractures occur within_____________?
Show answer Hide answer
Answer: A. ductile material
Fibrous fractures occur within ductile materials undergoing significant plastic deformation. The fracture surface appears dull, silky, and fibrous due to micro-void coalescence. Ductile metals stretch and neck down exten...
Q4. If a material fractures below its yield point, the failure stems from___________________?
Show answer Hide answer
Answer: B. fatigue
Fatigue failure occurs when mechanical components experience repeated cyclic stress loading over time. Microscopic cracks initiate and propagate gradually until sudden structural fracture occurs. Crucially, maximum cycli...
Q5. Leak-tight joints are best achieved using this thread profile____________________?
Show answer Hide answer
Answer: E. NPT (national pipe threads)
National Pipe Thread standards utilize tapered thread profiles that wedge tightly together during assembly. This progressive wedging action deforms the metal slightly to block helical fluid leakage paths. Pipe thread sea...
Q6. When an unsupported elastic bar of uniform cross-section experiences longitudinal impact from a rigid bob traveling at velocity v, a compressive wave of intensity sc propagates through it such that______________________?
Show answer Hide answer
Answer: A. vpE
The magnitude of the stress wave generated by longitudinal impact is proportional to impact velocity. It depends directly on the acoustic impedance product of mass density and elasticity modulus. Mathematical derivation...