[A]. 50%
[B]. 56.7%
[C]. 66.67%
[D]. 76.66%
✅ The correct answer is option C.
Mechanical Engineering MCQs
If p1, is the pressure of air entering the L.P. cylinder and p2 is the pressure of air leaving the L.P. cylinder (or intercooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D1 = Dia. of L.P. cylinder, and D2 = Dia. of H.P. cylinder)
[A]. D1/D2 = p1p2
[B]. D1/D2 = p1/p2
[C]. D1/D2 = p2/p1
[D]. none of these
✅ The correct answer is option C.
The heat transfer by conduction through a thick sphere is same as through a thick cylinder.
[A]. True
[B]. False
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✅ The correct answer is option B.
Which of the following indicates a multigrade oil ?
[A]. SAE 30
[B]. API SF
[C]. SAE 20 W-50
[D]. API 50
✅ The correct answer is option C.
A saw which cuts wood during the return stroke of the saw is known as
[A]. push saw
[B]. pull saw or draw saw
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✅ The correct answer is option B.
Resilience is the
[A]. energy stored in a body when strained within elastic limits
[B]. energy stored in a body when strained upto the breaking of the specimen
[C]. maximum strain energy which can be stored in a body
[D]. none of the above
✅ The correct answer is option D.
A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be
[A]. 400 MPa
[B]. 500 MPa
[C]. 900 MPa
[D]. 1400 MPa
✅ The correct answer is option D.
The coefficient of performance of Heat Pump is always __________ one.
[A]. equal to
[B]. less than
[C]. greater than
null
✅ The correct answer is option C.
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
[A]. lower pair
[B]. higher pair
[C]. self-closed pair
[D]. force-closed pair
✅ The correct answer is option A.
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the
[A]. pitch circle
[B]. base circle
[C]. pitch curve
[D]. prime circle
✅ The correct answer is option C.