71. Which of the following is minimum tillage operation?
72. Harrow is an implement of
73. Traction of wheel can be improved by
74. Intercultural operations with implements is usually done bar
75. Seed drill is classified into
76. Soil strength is determined by
77. Rate of mass transfer depends on . . . . . . . .
78. Carbon content in low carbon steel
79. Best speed to get minimum brake specific fuel consumption is
80. Most durable wood to manufacturing of agricultural implements
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