ISRO Solved Question Papers For Mechanical With Answers

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1. The critical value of Reynolds number for transition from laminar to turbulent boundary layer in external flows is taken as
(a) 2300 - Answer
(b) 4000
(c) 5 x 105
(d) 3 X 106
(Expl : Critical value of Reynolds number for transition from laminar to turbulant layer in external flows is taken as 2300.)

2. The by-pass factor of single coil in an air-conditioner is 0.7. The by-pass factor, if three such cooling coils with the same appartus dew point are kept one behind the other will be
(a) 0.210
(b) 0.292
(c) 0.343 - Answer
(d) 0.412

3. Which one of the following statements is true for air conditioning duct design ?
(a) Static regain method is used, when the duct work is extensive, total pressure drop is low and flow is balanced
(b) Static regain method is used, when the duct work is extensive, total pressure drop is high and flow is unbalanced
(c) Equal friction method is used, when the duct work is extensive, total pressure drop is low and flow is balanced - Answer
(d) Equal friction method is used, when duct work is extensive, total pressure drop is low and flow is unbalanced.

4. For an-conditioned space, RTH = 100 kW; RSHF = 0.75, volume flow rate is equal to 100 m3/minute and indoor design specific humidity is 0.01 kg/(kg of dry air). The specific humidity of supply air is
(a) 0.010
(b) 0.0075
(c) 0.005 - Answer
(d) 0.0025


ISRO Mechanical Engineering exam paper



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