21. Froude number is the ratio of inertial force to
(a) elasticity (b) surface tension
(c) gravitational force (d) viscosity
22. Proof resilience per unit volume of a material is known as
(a) modulus of resilience (b) resilience
(c) proof resilience (d) toughness
23. Cooling range in cooling tower is the
(a) difference in temperature of hot water entering and cold water leaving
(b) amount of heat removed by the cooling tower in kcal/hr
(c) difference in temperature of the cold water and atmospheric temperature
(d) difference in temperature of the cold water leaving the cooling tower and the wet bulb temperature of surrounding air
24. The vapour compression refrigerator employs the following cycle
(a) Carnot (b) Reversed Carnot
(c) Rankine (d) Reversed Rankine
25. A certain high tensile strength steel has a modulus of elasticity of 2x$10^6$ kg/cm^2 and a yield point stress of 6,000 kg/cm^2. Find the minimum limiting value of the slenderness ratio for which Euler's equation is valid
(a) 99 (b) 80
(c) 57 (d) 75
26. The ratio of central deflection due to a certain load in the case of a beam freely supported at both ends to the beam fixed at both ends will be
(a) 1/2 (b) 4
(c) 1/4 (d) 2
27. A framed structure is prefect if it contains members equal to
(a) n-1 (b) 2n-3
(c) 2n-1 (d) n-2
28. Prandtl number is expressed by
(a) $\frac{Inside-diameter-of-tube}{equivalent-thickness-of-film}$
(b) $\frac{specific-heat X viscosity}{thermal-conductivity}$
(c) $\frac{thermal-conductivity}{equivalent-thickness-of-film}$
(d) $\frac{molecular-diffusivity-of-momentum}{thermal-conductivity}$
29. Coining is the operation of
(a) cold forging (b) hot forging
(c) cold extrusion (d) piercing
30. Moment of inertia of a square of side d about the diagonal is
(a) $d^4/18$ (b)$d^4/24$
(c) $d^4/12$ (d) $d^4/8$
31. If the velocity of projection is u m/sec and the angle of projection is α, the maximum height of the projectile on a horizontal plane is
(a) $\frac{u^2 sin^2α}{2g}$ (b) $\frac{u^2 cos^2α}{2g}$
(c) $\frac{u^2 tan^2α}{2g}$ (d) $\frac{u^2 sin^2α}{g}$
32. If the air heated without changing its moisture content, the dew point will
(a) increase (b)remains same
(c) decrease (d) unpredictable
33. In a tensile testing experiment on a specimen of 1 cm^2 area, the maximum load observed was 5 tonnes and neck area 0.25 cm^2. The ultimate tensile strength of specimen is
(a) 2.5 tonne/cm^2 (b) 10 tonne/cm^2
(c) 5 tonne/cm^2 (d) 20 tonne/cm^2
34. For a given material assume, Young's modulus E = 300 GN/m^2 and modulus of rigidity G = 150 GN/m^2. Its bulk modulus K will be
(a) 120 GN/m^2 (b) 100 GN/m^2
(c) 200 GN/m^2 (d) 250 GN/m^2
35. A steel wire hangs vertically under its own weight. If its density is 10000 kg/m^3 and allowable stress is 3000 kg/cm^2 then how much length it can sustain
(a) 2500 m (b) 1250 m
(c) 3000 m (d) 5000 m
36. Laser is produced by
(a) graphite (b) ruby
(c) diamond (d) emerald
37. M.I.of a triangular section of base a and height h about an axis passing through its c.g. and parallel to base is
(a) $\frac{ah^3}{8}$ (b) $\frac{ah^3}{12}$
(c) $\frac{ah^3}{24}$ (d) $\frac{ah^3}{36}$
38. To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gasses is
(a) multiplied by its molecular weight
(b) divided by its molecular weight
(c) multiplied by its density
(d) multiplied by its specific weight
39. Film coefficient is defined as
(a) $\frac{Inside-diameter-of-tube}{equivalent-thickness-of-film}$
(b) $\frac{specific-heat X viscosity}{thermal-conductivity}$
(c) $\frac{thermal-conductivity}{equivalent-thickness-of-film}$
(d) $\frac{molecular-diffusivity-of-momentum}{thermal-conductivity}$
40. The longitudinal stress induced in a thin walled cylindrical vessel is
(a) pD/2t (b) pD/t
(c) pD/4t (d) pD/3t
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