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Browse complete papersA gas turbine produces 4 MW power with 5 kg/s air flow. Find specific work.
400 kJ/kg
800 kJ/kg
600 kJ/kg
1000 kJ/kg
Correct answer
400 kJ/kg
A flat belt drive runs at a speed of 12 m/s. The tension in the tight side of the belt is 900 N, while the tension in the slack side is 600 N. Determine the power transmitted by the belt drive.
Correct answer
The coefficient of friction (\(\mu\)) for oak tanned leather belts on a cast iron pulley, at the point of slipping is:
\(\mu = 0. 54 - (42.6 / (152. 6 + v))\)
\(\mu = 0. 64 - (42.6 / 152. 6 + v)\)
\(\mu = 0. 54 - (42.6 / 172. 6 + v)\)
\(\mu = 0. 54 - (42.6 / 152. 6 + d)\)
Correct answer
\(\mu = 0. 54 - (42.6 / (152. 6 + v))\)
What is the formula for tearing resistance in rivets?
\(pt = (p - d)t.\sigma _t\)
\(pt = (p - d)t\)
\(pt = (p - 0. 1d)t\)
\(pt = (p - 0. 2d)t\)
Correct answer
\(pt = (p - d)t.\sigma _t\)
A single-strand chain No. 12A is used in a mechanical drive. The driving sprocket has 17 teeth and rotates at 1,000 rpm (neglecting centrifugal force acting on the chain). What factor of safety should be used for the standard power rating?
fs = 2
fs = 11. 73
fs = 3
fs = 4
Correct answer
fs = 2
An engine running at 150 r.p.m. drives a line shaft by means of a belt. The engine pulley has a diameter of 750 mm, and the pulley on the line shaft has a diameter of 450 mm. A 900 mm diameter pulley on the line shaft drives a 150 mm diameter pulley keyed to a dynamo shaft.
Find the speed of the dynamo shaft, assuming there is no slip.
1200 r.p.m.
1500 r.p.m.
1300 r.p.m.
1400 r.p.m.
Correct answer
1200 r.p.m.
Which one of the following is a positive drive?
Chain drive
V-belt drive
Flat belt drive
Open belt drive
Correct answer
Chain drive
What is the efficiency range for a single riveted butt joint?
55% to 60%
65% to 70%
70% to 83%
80% to 90%
Correct answer
55% to 60%
In the analysis of collar bearings, which assumption is made under the uniform wear theory?
Pressure is inversely proportional to the radius
Pressure is directly proportional to the radius
Pressure is maximum at the middle
Pressure remains the same across the surface
Correct answer
Pressure is inversely proportional to the radius
Which of the following is considered undesirable in a good bearing material?
Low coefficient of friction
High coefficient of friction
High thermal conductivity
Resilience
Correct answer
Low coefficient of friction