Related Questions

High speed steel tools retain their hardness up to a temperature of
A 250°C
B 350°C
C 500°C
D 900°C
High speed steel cutting tools operate at cutting speeds _________ than carbon steel tools.
A 2 to 3 times lower
B 2 to 3 times higher
C 5 to 8 times higher
D 8 to 20 times higher
The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.
A Equal to
B Less than
C More than
D None of these
The correct sequence of tool materials in increasing order of their ability to retain their hot hardness is
A Carbide, ceramic, cermet, borazon
B Ceramic, carbide, borazon, cermet
C Cermet, carbide, ceramic, borazon
D Borazon, ceramic, carbide, cermet
In 1995 a certain store had 1,800 tools in stock that had been purchased for Tk. 30 each. If 1,000 of these tools were sold in 1995 for Tk. 40 each and the remaining 800 were sold in 1996 for Tk. 50 each, how much greater was the gross profit on the tools sold in 1996 than of 1995?
A Tk. 0
B Tk. 6,000
C Tk. 8,000
D Tk. 32,000
High speed steel drills can be operated at about _________ the speed of high carbon steel drills.
A One-half
B One-fourth
C Double
D Four times
Relief angles on high speed steel tools usually vary from
A 0° to 3°
B 3° to 10°
C 10° to 20°
D 20° to 30°
For machining a mild steel workpiece by a high speed steel tool, the average cutting speed is
A 5 m/min
B 10 m/ min
C 15 m/min
D 30 m/min
The average cutting speed for turning mild steel with a high speed steel tool is
A 15 to 19 m/min
B 25 to 31 m/min
C 60 to 90 m/min
D 90 to 120 m/min
Grain hardness is measured by the __________ hardness testing method.
A Knoop
B Rockwell F
C Shore sceleroscope
D Vicker's

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