Bihar Polytechnic Civil 3rd SEM Dec 2019 Paper on Mechanical Operation
| Sr. No. | Questions with options |
| 1 | Shape factor for a cylinder whose length equals its diameter is
(a) 1.5 (b) 0.5 (c) 1.0 (d) None of these |
| 2 | The opening of 200 mesh screen (Taylor series) is
(a) 0.0074 cm (b) 0.0074 mm (c) 0.0047 cm (d) None of these |
| 3 | Filteration of water in a paper mill is done by _____ filter.
(a) Open sand (b) Plate and frame (c) Vacuum leaf (d) Sparkler |
| 4 | Which of the following screens has the maximum capacity
(a) Grizzles (b) Trammels (c) Shaking screen (d) Vibrating screen |
| 5 | Colloidal mills are used for _____grinding.
(a) Coarse (b) Intermediate (c) Fine (d) Ultrafine |
| 6 | Moor filter is a _________type of filter
(a) Leaf (b) Press (c) Rotary (d) Sand |
| 7 | Which one is a filter aid?
(a) Canvas fabric (b) Diatomaceous earth (c) Calsied lime (d) None the these |
| 8 | Ball mills take feed upto about ___________mm in size
(a) 1 mm (b) 50 mm (c) 500 mm (d) 1400 mm |
| 9 | In black jaw crusher, the angle between the jaws is usually –
(a) 5 degree (b) 15 degree (c) 30 degree (d) 90 degree |
| 10 | Size reduction of asbestos is done by a crusher
(a) Hammer crusher (b) Ball crusher (c) Jaw crusher (d) Gyratory crusher |
| 11 | Size reduction of ice is done by
(a) Stamp mill (b) Ball mill (c) Ring roll mill (d) Toothed roll crusher |
| 12 | For coarse reduction of hard solids _____method is used
(a) Impact (b) Attrition (c) Compression (d) Cutting |
| 13 | Mesh indicates the number of holes per ___
(a) Square inch (b) Linear inch (c) Square foot (d) Linear foot |
| 14 | In froth flotation chemical agent added to cause air adherence is called _____
(a) Collector (b) Prother (c) Modifier (d) Activator |
| 15 | Kick’s law relates to –
(a) Energy consumption (b) Final particle size (c) Feed size (d) None of these |
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| 16 | Devices which separate particles of differing densities are known as –
(a) Thickner (b) Cyclones (c) Filter (d) Both (a) & (b) |
| 17 | The compressibility coefficient of incompressible cake is ?
(a) 1 (b) 0 (c) -1 (d) Infinity |
| 18 | A plot of filerate volume versus time for a constant pressure filteration is a _____
(a) Straight line (b) Parabola (c) Hyperbola (d) Exponential curve |
| 19 | Which of the following has the minimum rittingers number?
(a) Galena (b) Pyrites (c) Calcite (d) Quartz |
| Data Collected By – Rashmi | |
| Published On – 10th June 2022 | |
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