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UP Polytechnic Lecturer: Mechanical Quiz 23
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Question 1
A gear train is as shown in the figure below, in which gears A and B have 20 and 40 teeth, respectively. If arm C is fixed and gear A rotates at 100 r.p.m., the speed of gear B will be
Question 2
In a steam power plant the work output and the pump work are 1000 kJ/kg and 10 kJ/kg respectively. The net work ratio is
Question 3
Among the following four designs of a flywheel with given mass M (kg) and external diameter D (m), which is the one with highest energy storage capacity?
Question 4
The chief advantage of die casting is _____.
Question 5
The tension in the cable supporting a lift moving upwards is twice the tension when the lift moves downwards. What is the acceleration of the lift?
Question 6
In a Kaplan turbine, the power developed is 20000 kW under a head of 30 m. The flow ratio is 0.6 and boss diameter is 0.5 times runner diameter. The overall efficiency of the turbine is 80%. The discharge through the turbine is:
Take g=10 m/s2
Question 7
What does 18-8 steel stands for?
Question 8
The stretch in a steel rod of circular cross section, having a length L subjected to a tensile load P and tapering uniformly from a diameter d1 at one end to a diameter d2 at the other end, is given by
Question 9
A Watt governor rotates at a vertical height of 250 mm at a speed of 60 rpm. If the speed is now changed to 80 rpm, its new vertical height in mm will be:
Question 10
Pressure angle in involute gears will:
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