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(A) Increasing the Forward Speed of Combine (B) Increasing the Cylinder Peripheral Speed (C) Decreasing the Concave Clearance (D) All of the Above

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(A) Increasing the Forward Speed of Combine (B) Increasing the Cylinder Peripheral Speed (C) Decreasing the Concave Clearance (D) All of the Above HARVESTING AND THRESHING MACHINES 1. Cylinder loss in a combine can be reduced by: (A) Increasing the forward speed of combine (B) Increasing the cylinder peripheral speed (C) Decreasing the concave clearance (D) All of the above 2. The ratio of reel peripheral speed to forward speed of combine is called (A) Velocity ratio (B) Reel speed index (C) Kinematic index (D)None of the above 3. The thresher used for especially sunflower (A) Axial flow thresher (B) Rasp bar thresher (C) Peg tooth type (D) Spike tooth 4. Length of cut in straw chopper can be adjusted by (A) Change the feed mechanism (B) Changing number of knives on feed mechanism (C) Changing speed of cutter bar (D) all of the above 5. Most commonly used threshing mechanism on the grain combine is (A) Axial flow thresher (B) Rasp bar thresher (C) Peg tooth type (D) Spike tooth 6. A thresher, not equipped with aspirator is called (A) Drummy type thresher (B) Paddy thresher (C) Wheat thresher (D) Multi crop thresher 7. The cutter bar of a vertical conveyer reaper is set to the direction of motion at about (A) 78 (B) 88 (C) 68 (D) 48 8. The total permissible loss in a combine harvester could be of the order of (A) 6 to 10 percent (B) 12 to 16 percent (C) 8 to 9 percent (D) 1.5 to 3 percent 9. In a combine harvester the ratio of reel peripheral speed to forward Speed (reel speed index) should normally be in the range of (A) 1.25 to 1.50 (B) 1.50 to 1.7 (C) 1.75 to 2.00 (D) None of the above 10. Most important factor affecting threshing efficiency (A) Peripheral speed (B) Cylinder concave clearance (C) Feed rate (D) Moisture content 11. Olpad thresher is used for (A) Gram (B) Paddy (C) Wheat (D) All of the above 12. The material left by the machine during harvesting operation is known as (A) Stubbles (B) Swath (C) Straw (D) Windrow 13. For better threshing of a crop the optimum moisture content is (A) 10 - 12 % (B) 12 - 15 % (C) 15 - 20 % (D) 17 – 2 5% 14. The power required to accelerate forage at a feed rate of 24 kg/s, at the cutter head of a combine at a peripheral velocity of 29.9 m/s is equal to (A) 13.73 kW (B) 12.48 kW (C) 10.73 kW (D) 11.55kW 15. Thresher blows broken grain with chaff due to (A) High cylinder speed (B) More feed rate (C) Cylinder concave clearance is more (D) Moisture content is more 16. The machine which cuts the crop and lay in fine windrow is known as (A) Mower (B) Windrower (C) Combine (D) Harvester 17. Cylinder loss in a stationary power thresher can be reduced by increasing the (A) Cylinder peripheral speed (B) Concave clearance (C) Blower speed (D) All of the above 18. In conventional mowers the crank and pitman are connected by (A) Crank shaft (B) Bevel gears (C) Ball and socket (D) Chain and sproket 19. A multi crop thresher is equipped with (A) Spike tooth cylinder (B) Rasp bar cylinder (C) Beater (D) All of the above 20. Reaper is used for (A) Weeding (B) Threshing (C) Cutting crop (D) Windrowing 21. Wire loop type cylinders are generally used in (A) Paddy threshers (B) Maize thresher (C) Wheat thresher (D) All of the above 22. The speed of axial flow sunflower thresher is (A) 200 - 300 rpm (B) 300 - 350 rpm (C) 300 - 400 rpm (D) 400 - 500 rpm 23. A thresher causes more seed damage if (A) Speed is increased (B) Feed rate is reduced (C) Clearance is increased (D) Speed is reduced 24. A spike tooth has advantages over rasp bar (A) More positive feeding action (B) Does not plug easily (C) Requires less power (D) All of the above 25. The purpose of registration in a mower is (A) To get uniform length of cut grass (B) To run the mower at minimum power (C) To run the mower at uniform torque (D) To reduce the occurrence of overload 26. The reciprocating type mower is fitted with (A) A reciprocating cutter bar (B) A rotary blade (C) Fixed knives (D) Swinging knives 27. The average threshing outturn of a paddy thresher in kg/h is (A) 500 (B) 650 (C) 800 (D) 1000 28. In an axial flow thresher the concave clearance is (A) 3 cm (B) 4 cm (C) 5 cm (D) 6 mm 29. For proper alignment the amount of lead generally provided in a reciprocating type mower cutter bar is about. (A) 5 mm per metre of bar length (B) 10 mm per metre of bar length (C) 15 mm per metre of bar length (D) 20 mm per metre of bar length 30. Type of concave used in a rasp bar type thresher is (A) Open type (B) Closed type (C) Semi open type (D) All of the above 31. The theoretical length of cut in a field chopper can be increased by (A) Increasing the number of knives (B) Decreasing the peripheral speed of the feed rolls (C) Increasing the rotational speed of the cutter bar (D) None of the above 32. Most commonly used harvesting tool (A) Sickle (B) Khurpi (C) Spade (D) All of the above 33. A properly aligned mower shows that the (A) Crank pin and knife end are in straight line (B) Crank pin and knife head and outer end are in straight line (C) The cutter bar is at right angle to the direction of motion of tractor (D) Knife head and crank pin are at 90 degree 34. In reciprocating type mower, the knife clip of knife section restricts (A) Horizontal displacement of knife (B) Side displacement of knife (C) Vertical displacement of knife (D) Horizontal and side displacement of knife 35. The speed of cutter bar in combine is (A) 400 - 550 rpm (B) 600 - 900 rpm (C) 800 - 1200 rpm (D) Above 1200 rpm 36. The cutter bar of a tractor-operated mower ordinarily makes (A) 800 - 1200 strokes/min (B) 1600-2000 strokes/min (C) 2400 - 2800 strokes/min (D) None of the above 37. The cutter bar knife of a reciprocating mower reciprocates (A) Ledger plate (B) Bearing plate (C) Guards (D) Shoes 38. The number of knives on powered chaff cutter (A) 2 – 6 (B) 1 – 2 (C) 5 – 10 (D) 10 - 20 39. Two bladed flywheel type forage cutter rotates at 60 rev/min. At a feed rate of 1.26 m/min, the theoretical length of the cut of the forage will be (A) 5.3 mm (B) 10.5 mm (C) 21.0 mm (D) 42.0mm 40. Cutting speed of the impact type cutter is (A) 10 - 20 m/s (B) 20 - 40 m/s (C) 46 - 56 m/s (D) 50 - 60 m/s 41. A ferrule is provided (A) Sickle (B) Khurpi (C) Spade (D) Vertical conveyor reaper 42. Recommended peripheral velocity of spike-tooth threshing cylinder for wheat crop is (A) Less than 20 m/s (B) 20 to 25 m/s (C) 25 to 30 m/s (D) 30 to 35 m/s 43. Kinematic index of straw walker should be (A) 1.2 - 2.2 (B) 2.2 - 2.6 (C) 3.2 - 4.2 (D) 4.2 - 6.2 44. The cutting section of a flail mower is performed (A) Cutter bar (B) Swinging knives (C) Reciprocating knife (D) Fixed fingers 45. During harvesting with combine the standing crop are pushed to the cutter bar by (A) Header (B) Reel (C) Auger(D) Cylinder 46. Cutting speed of cutter bar of a mower is (A) 35-50 m/s (B) 10-20 m/s (C) 2- 4 m/s (D) 0.2-0.4 m/s 47. The movers are designed to cut (A) Wheat (B) Paddy (C) Sunflower (D) Grasses 48. An olpad thresher is operated by (A) Manually (B) By a pair of bullocks (C) By a tractor (D) By an electric motor 49. In a axial paddy power threshers, a spike tooth cylinder is preferred over a rasp bar cylinder (A) It has more positive feeding action (B) It requires less power (C) It does not plug easily (D) All of the above 50. A self-propelled combine harvester has a purchase price of Rs. 8,00,000, an expected economic life of 10 years and an expected salvage value of 10% of new cost. At the time of purchase the prevailing annual interest rate is 7%. The annual interest on investment following straight line method would be (A) Rs.5,600 (B) Rs.25,200 (C) Rs.30,800 (D) Rs.56,000 51. Working element of a paddy thresher is (A) Rasp bar (B) Wire loop (C) Spike tooth (D) Angle iron bar 52. The most common type of conveyer used in combine is (A) Chain conveyer (B) Table conveyer (C) Belt conveyer (D) Augur conveyer 53. The cutter bar of a vertical conveyer reaper is inward lead (A) 7 (B) 2 (C) 8 (D) 4 .
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