21. A forging method used for reducing the diameter of a bar and in the process making it longer is termed as-
A. Extruding
B. Upsetting
C. Punching
D. Fullering
22. Poor machinability of a centrifugally cast iron pipe is due to-
A. Chilling
B. Segregation
C. Dense structure
D. High mould rotation speed
Read More- Basic Terms in Thermodynamics
23. A grinding wheel of 150 mm diameter is rotating at 3000 rpm. Find the grinding speed(m/s)?
A. 4.55Π
B. 7.5Π
C. 45Π
D. 75Π
24. In a plain milling machine, the table can be moved-
A. Vertically
B. Longitudinally
C. Crosswise
D. All of these
25. The process of removing the burrs or flash from a forged component in drop forging is known as-
A. Trimming
B. Fettling
C. Swagging
D. Perforating