In an SI engine, combustion stage 1 takes 1 ms and combustion stage II takes 1.5 ms when the engine runs at 1000 rpm. If stage I time duration is independent of engine speed, then the additional spark advance necessary (if engine speed is doubled) will be ________.
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Solution
An aeroplane travel at 400 km/h at sea level where the temperature is 15°C. The velocity of aeroplane at the same mach number at an altitude where a temperature of– 25°C is prevailing will be ________.
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Solution
A motor has a wheel base of 280 cm and the pivot distance of front stub axles is 140 cm. When the outer wheel is turned through 30°, angle of turn of the inner front wheel for correct sheering will be ________.
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Solution
A spur gear transmits 10 kw at a pitch line velocity of 10m/s driving gear hav a diameter of 1 m. The tangential force between the driver and follower and transmitted torque will be ________.
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Solution
In a tensile test, near the elastic limit zone.
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Solution
tensile stress decreases at a faster rate near the elastic limit zone in a tensile test.
A thin cylinder contains fluid at a pressure of 500 N/m2, the internal diameter of shell is 0.6 m and the tensile stress in the material is to be limited to 9000 N/m2. The shell must have a minimum wall thickness of nearly will be ________.
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Solution
In the grain size determination. Using standard charts, the relation between the given size number n and the average number of grains N per square inch at a magnification of 100X is
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Solution
Average number of grains/(inch)2(N) = 2n–1
A gating ratio of 1:2:4 is used to design the gating system for magnesium alloy casting. This gating ratio refers to the cross-section areas of various gating elements as given below
1.Down sprue
2.Runnerbar
3.Ingates
The correct sequence of above elements in the ratio of 1:2:4 is
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Solution
Gating ratio is described as the ratio of sprue area of total runner area to total gating area i.e., as: ar : ag
A PERT activity has an optimistic time estimate of 3 days, a pessimistic time estimate of 8 days and a most-likely time estimate of 10 days. The expected time of activity will be________.
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Solution
Which one of the following information combinations has lowest break even point.
Fixed cost (in ₹) Variable cost/unit Revenue unit
(In ₹) (In ₹)
(a)30,000 10 40
(b)40,000 15 40
(c)50,000 20 40
(d)60,000 30 40
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Solution