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Polynomials

Polynomials

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ISRO Mechanical Engineering Fluid Mechanics Questions, Answers and Explanation

ISRO Mechanical Engineering Fluid Mechanics Fluid Properties - Bulk modulus 2011. 10.  A liquid compressed in cylinder has a volume of 0.04 m 3  at 50kg/cm 2  and a volume of 0.039 m 3  at 150 kg/cm 2 . The bulk modulus of elasticity of liquid is a) 400 kg/cm 2 b) 40 x 10 6  kg/cm 2 c) 40 x 10 5  kg/cm 2 d) 4000 kg/cm 2 Answer d) 4000 kg/cm 2 Explanation The bulk elastic properties of a material determine how much it will compress under a given amount of external pressure. The ratio of the change in pressure to the fractional volume compression is called the bulk modulus of the material. The reciprocal of the bulk modulus is called the compressibility of the substance. Bulk Modulus, B = ΔP/(ΔV/V) Here ΔP = 150-50 =100 kg/cm 2 ΔV = 0.04-0.039 = 0.001m 3 V = 0.04m 3 B = (100/(0.001/0.04)) = 100x0.04/0.001 =  4000 kg/cm 2 Fluid Properties - Surface Tension 2011.13  If the surface tension of water-air interface ...
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ISRO Mechanical Strength of Materials Questions, Answers and Explanation

Strength of Materials Simple Stresses and Strains 2017.2.9.  Which of the following is true for ductile materials? a) Engineering stress – strain curve cannot have negative slope b) Most applicable failure theory is maximum principal stress theory c) Ultimate strain is the strain at ultimate stress d) Strain hardening is represented by a negative slope in engineering stress strain curve Answer c)  Ultimate strain is the strain at ultimate stress Explanation  Principal stress theory is applicable for brittle materials. Elastic Constants 2017.2. 2.  For isotropic materials, the modulus of Elasticity in tension and shear (E and G) are related to the Poisson's ratio (&nu) as follows a) E = G/(2(1+ν)) b) G = E/(2(1+ν)) c) G = E/(2(1-ν)) d) E = G/(2(1-ν)) Answer b) G = E/(2(1+ν)) Explanation Derivation of relation between Modulus of elasticity in tension and shear Torsion 2017.2.76.  A 3m l...
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The Da Vinci Code trip

Chapter I of the novel begins with Robert Langdon asleep in the Ritz Hotel. Our trip begins with ourselves just outside the Ritz Hotel. One of the posh hotels with a lot of high end luxury cars parked outside. Ritz Hotel, Paris Sitting up now, Langdon frowned at his bedside Guest Relations Handbook, whose cover boasted:     SLEEP LIKE A BABY IN THE CITY OF LIGHTS. SLUMBER AT THE PARIS RITZ. In the beginning on his way to Louvre - The crisp April air whipped through the open window of the Citroën ZX as it skimmed south past the Opera House and crossed Place Vendôme . As the Citroën accelerated southward across the city, the illuminated profile of the Eiffel Tower appeared, shooting skyward in the distance to the right. Symbologists often remarked that France—a country renowned for machismo, womanizing, and diminutive insecure leaders like Napoleon and Pepin the Short—could not have chosen a more apt national emblem than a thous...
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