Related Questions

The main size reduction operation in ultrafine grinders is
A Cutting
B Attrition
C Compression
D Impact
In centre less grinders, the maximum angular adjustment of the regulating wheel is
A 5°
B 10°
C 15°
D 20°
In centerless grinders, the regulating wheel is inclined at
A 0° to 8°
B 9° to 15°
C 16° to 20°
D 21° to 25°
The actual feed in centerless grinders is given by (where d = Dia. of regulating wheel, n = Revolutions per minute, and α = Angle of inclination of wheel)
A πd
B πdn
C πdn sinα
D πdn cosα
Ultrafine grinders operate principally by
A Slow compression
B Impact
C Attrition
D Cutting action
Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.
A Acrylic
B Polyester
C Nylon 6:6
D Polypropylene
Which of the following terminology is not used for size reduction of materials to fine sizes or powders?
A Comminution
B Dispersion
C Pulverisation
D Compression
General mechanism of size reduction in intermediate and fine grinder is by
A Cutting action
B Compression
C Compression and tearing
D Impact and attrition
A reduction of 15% in the price of a shirt resulted in the reduction of the price of the shirt by Tk 21. What was the previous price of the shirt?
A Tk. 175
B Tk. 140
C Tk. 150
D Tk. 120
Determine power rating of an electric motor if it runs at 1440 rpm and line shaft transmits torque of 75 Nm. Assume Reduction ratio =1.6
A 10.36 kW
B 11.3 kW
C 7.068kW
D 9.12kW

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