Mock campus paper for mechanical 6
1. The efficiency of an inclined plane at α to the vertical is expressed ( for θ as the angle of friction) for horizontal direction applied force will be
a) tan (α + θ) / tan α b) tan α / tan (α + θ) c) tan (α - θ) / tan α d) tan α / tan (α - θ)
2. In a De Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section will be
a) 3.3 bar b)5.46 bar c)8.2 bar d)9.9 bar
3.In an ideal impulse turbine, the
a) absolute velocity at the inlet of moving is equal to that at the outlet
b) relative velocity at the inlet of the moving blade is equal to that at the outlet
c) axial velocity at the inlet is equal to that at outlet
d) whirl velocity at the inlet is equal to that at the outlet
4. The nature of flow of a fluid inside a tube i.e., whether it is turbulent or laminar, is ascertained by
a) Flow velocity b) Tube size c) Viscosity of fluid d) Reynold’s number
5. Stoke’s law is valid when the particle Reynolds number is
a) <1 b) >1 c) <5 d) none of these
6. Flow stress corresponds to
(a) fluids in motion (b) breaking point (c) rupture stress (d) plastic
deformation of solids
7 A steel wire hangs vertically under its own weight. If its density is 8000kg/m^3
and allowable stress is 2000 kg/cm^2 then how much length it can sustain
(a) no limit (b) 1250 m (c) 2500 m (d) 2000 m
8. An equipment has been purchased for Rs. 120 and is estimated to have 10 years life and a scrap value of Rs. 20 at the end of life. The book value of the equipment at the end of sixth year when the interest rate is 5%(using declining balance methods) will be
a) Rs. 40.95 b)Rs. 51.25 c)Rs. 55.00 d)Rs. 59.25
9.Process X has fixed cost of Rs. 40,000 and variable cost of Rs. 9 per unit whereas process Y has fixed cost of Rs. 16000 and variable cost of Rs. 24 per unit. At what production quantity, the total cost of X and Y are equal?
a) 1200 units b)1600 units c)2000 units d)2400 units
10. Two forces acting along the same line but in opposite directions are called
a) Concurrent b) coplanar c) collinear d) non concurrent
11 The total number of instantaneous centres for a mechanism of n links is
a) n b) n/2 c) n-1 d) n(n-1)/2
12. In an automobile the power is transmitted from gear box to differential through
a) Knuckle joint b) Universal joint c) Oldham’s coupling d) Hooke’s joint
13. The initial tension in a belt allowing for centrifugal tension Tc is
a) ( T1 + T2 + Tc)/2 b) ( T1 + T2) + Tc/2 c) ( T1 + T2) + Tc d) ( T1 + T2 – 2 Tc)/2
14.. In a radial cam with a roller on follower, the pitch circle can be defined as
a) The smallest circle tangent to the pitch curve b) The smallest circle tangent to the cam profile
c) A circle drawn with radius equal to the distance between the pitch point and the centre of base circle
d) None of these
15. A 3-stage Rateau turbine is designed in such a manner that the first two stages develop equal power with identical velocity diagram while the third one develops more power with higher blade speed. In such a multistage turbine the blade ring diameter
a) is the same for all the three stages
b) gradually increases from the first to third stage
c) of the third stage is greater than that of the first two stages
d) of the third stage is less than that of the first two stages
16.. In metals subjected to cold working, strain hardening effect is due to
a) slip mechanism b)twining mechanism c)dislocation mechanism d)fracture mechanism
17.. In a eutectic system, two elements are completely
a) Insoluble in solid and liquid state b) Soluble liquid state c) Soluble in solid state
d) Insoluble in liquid state
18. Cast iron is used for machine beds because of its high
a) Tensile Strength b) Endurance strength c) Damping capacity d) Compressive strength
19. Which one of the following properties is more sensitive to increase in strain rate?
a) Yield Strength b) Proportional limit c) Elastic limit d) Tensile Strength
20. Atomic packing factor(APF) in the case of copper crystal is
a) 0.52 b) 0.68 c) 0.74 d) 1.633
21. Martensite is a super-saturated solution of carbon in
a) alpha iron b) beta iron c) gamma iron d) delta iron
22.The unit of Young’s modulus is
(a) mm/mm (b) kg/cm (c) kg (d) kg/cm^2
23. If the radius of wire stretched by a load is doubled, then its young’s modulus will
be
(a) doubled (b) halved (c) become four times (d) becomes one-fourth
24. If a material expands freely due to heating it will develop
(a) thermal stress (b) tensile stress (c) no stress (d) compressive stress
25. The loss of strength in compression due to overloading is known is
(a) hysteresis (b) resilience (c) bouschinger effect (d) creep
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