Related Questions

The stone whose crushing strength is least, is
A Granite
B Chalk
C Marble
D Slate
H উচ্চতায় অবস্থিত একটি বেলুন থেকে একটি পাথর ছেড়ে দিলে তা । উচ্চতায় অবস্থিত একটি হেলানো তনের উপর আছড়ে পড়ে। হেলানো শুলকে আঘাতের পর পাথরটির বেগ আনুভূমিক হয়। h/H এর মান কত হলে পাথরটি ভূমিকে স্পর্শ করতে সর্বোচ্চ সময় নিবে? (A stone falls from a balloon at a height of H above the ground and hits an inclined plane in its path at a height of h. After impact, the velocity of the stone becomes horizontal. What should be the value of hill so that the stone will take maximum time to reach the ground?)
A H-hh
B 12
C 32
D hH-h
E 2
Crushing strength of a good building stone should be more than
A 50 MPa
B 100 MPa
C 150 MPa
D 200 MPa
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
A 16°
B 32°
C 40°
D 46°
Choke crushing (in case of a Jaw crusher) compared to free crushing
A Results in increased capacity
B Consumes less power
C Consumes more power
D Both A and C
For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to
A The new surface created
B The size reduction ratio
C The change in volume due to crushing
D None of these
Crushing strength of a first class brick should not be less than
A 3.5 N/mm2
B 7.0 N/mm2
C 10.5 N/mm2
D 14.0 N/mm2
Cold crushing strength of refractories depends upon its
A Composition
B Texture
C Firing temperature
D All of the above
Cold crushing strength of a refractory does not depend upon its
A Shape
B Composition
C Firing temperature
D Texture
For a square key made of mild steel, the shear and crushing strength are related as
A Shear strength is equal to crushing strength
B Shear strength is greater than crushing strength
C Shear strength is less than crushing strength
D None of the above

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