Related Questions

When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where $${\tau _{\text{u}}}$$ = Ultimate shear strength of the material of the plate)
A $${\text{dt}}{\tau _{\text{u}}}$$
B $$\pi {\text{dt}}{\tau _{\text{u}}}$$
C $$\frac{\pi }{4} \times {{\text{d}}^2}{\tau _{\text{u}}}$$
D $$\frac{\pi }{4} \times {{\text{d}}^2} \times {\text{t}}{\tau _{\text{u}}}$$
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where $$\sigma $$ = Stress for a plate with no hole i.e. nominal stress)
A $$\sigma \left( {1 + \frac{{\text{b}}}{{2{\text{a}}}}} \right)$$
B $$\sigma \left( {1 + \frac{{2{\text{a}}}}{{\text{b}}}} \right)$$
C $$\sigma \left( {1 + \frac{{\text{b}}}{{3{\text{a}}}}} \right)$$
D $$\sigma \left( {1 + \frac{{3{\text{a}}}}{{\text{b}}}} \right)$$
Punch ও die দিয়ে কোন শীটে বৃত্তকার গর্ত করতে কোন অপারেশন ব্যবহৃত হয়? 
A Shearing
B Pierching
C Punching
D Blanking
The operation of cutting a sheet of metal in a straight line along the length, is known as
A Plunging
B Notching
C Slitting
D Forming
If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated?
A Increases
B Decreases
C Unchanged
D Depends upon the metal
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?
A Increase
B Dacrease
C Remain constant
D Will increase first and then dcrease
The operation of producing cup shaped parts from flat sheet metal blanks by bending and plastic flow of metal, is known as
A Drawing
B Squeezing
C Coining
D Planishing
The operation of cutting of a flat sheet to the desired shape is called
A Shearing
B Piercing
C Punching
D Blanking
In metal cutting, use of low feeds and high cutting speeds is desired when the objective is
A High metal removal rate
B Dry machining
C Use of soft cutting tool
D Surface finish
In machining metal, cutting force at the cutting edge is measured by a
A Wattmeter
B Dynamometer
C Hydrometer
D Pyrometer

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