Related Questions

Which of the following statement is wrong about ultrasonic machining?
A It is best suited for machining hard and brittle materials.
B It cuts materials at very slow speeds
C It removes large amount of material
D It produces good surface finish
In ultrasonic machining, tool is made of
A Tungsten carbide
B Brass or copper
C Diamond
D Stainless steel
The abrasive slurry used in ultrasonic machining contains fine particles of
A Aluminium oxide
B Boron carbide
C Silicon carbide
D Any one of these
Ultrasonic machining is best suited for
A Tool steels
B Sintered carbides
C Glass
D All of these
In metal machining, the zone where the maximum heat is generated due to the plastic deformation of metal, is called
A Friction zone
B Work-tool contact zone
C Shear zone
D None of these
The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.
A 0.5
B 3
C 10
D 25
For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of
A 500
B 1000
C 1750
D 2750
If 1/2 of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after four strokes ?
A 15/16
B 7/8
C 1/4
D 1/8
The average of five numbers is 25. After one if the numbers is removed, the average of the remaining is 31. What number has been removed?
A 7
B 6
C 4
D 1
If 1/2 of the air in a tank is removed with each stroke of a vacuum pump,what fraction of the original amount of air has been removed after 4 strokes?
A 15/16
B 7/8
C 1/4
D 1/8

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