Question Statement:
Pasteurisation of milk can be carried out either at 91 °C for 3 s or at 73 °C for 30 s to inactivate vegetative cells of microorganism(s). The sterilisation value is 10 in both the cases. Thermal death time constant (z value) for reference temperatures of 73 °C and 91 °C, in °C, is nearest to
-type split: MCQ — 48 questions; NAT — 17 questions (no MSQ in this paper).
Farm Power and Soil & Water Conservation Engineering jointly carry 34 marks — the highest-yield pair. Within Farm Power, Tractors and Power Tillers alone contributed 5 questions (traction theory, ergonomics/noise, final drives, steering hydraulics).
Hydrology (Q.25, 58, 59) and Fluid Mechanics — flow in open channels (Q.21, 60) dominated Section 4.
Engineering Mathematics stayed formula-direct: Linear Algebra (2), Differential Equations (2), Numerical Methods (2), Calculus (1), Vector Calculus (1), Probability and Statistics (1).
Several 1-mark questions (Q.21, Q.28, Q.29) deliberately contained redundant data. Recognising the governing definition — rather than computing with every number given — was the real test.
Three high-value NAT questions demanded a non-obvious refinement of the standard formula: Q.54 (Taborek’s kingpin torque relation), Q.59 (Snyder’s duration correction) and Q.62 (riser projection deducted from bench width). Solving with the basic formula alone lands outside the official range in each case.
Options:
- (A) 18.0
- (B) 1.8
- (C) 9.0
- (D) 0.9