ISRO Scientist or Engineer Mechanical 2020

Instructions

For the following questions answer them individually

Question 51

$$\cos(z)$$ can be expressed as

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Question 52

Ina vector field; Divergence of the gradientis

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Question 53

If a continuously differentiable vector function is the gradientof a scalar function, then its curl is

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Question 54

What does ‘a’ and ‘e’ indicate in the surface texture symbol shown below

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Question 55

Two steel trusses, XY and YZ of identical size supports a load of 200 N as shown in fig. The length of the truss is 1m. The force in the truss xy in N is

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Question 56

A block weighing 100 N is resting on a plane inclined with horizontal as shown in Fig. What horizontal force P is necessary to hold the body from sliding down the plane? (Coefficient of friction can be taken as 0.25)

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Question 57

The ratio of maximum shearstress to average shear stress in a beam ofrectangular section is

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Question 58

A mass less beam has a loading pattern shown in figure. Find the bending moment at mid span?

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Question 59

Steel machine element at the critical section is in biaxial stress state with two principal stress being 300 $$\frac{N}{mm^{2}}$$ and 300 $$\frac{N}{mm^{2}}$$ (equal magnitude). Find the von Mises stress (in $$\frac{N}{mm^{2}}$$) in the member

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Question 60

A machine component of 90 kg mass needs to be held in position using three springs as shown below .The spring constants K_{1}, K_{2},K_{3} are 4,4 and 8 $$\frac{N}{m}$$ respectively. Find the natural freqeuncy of the system in $$\frac{rad}{sec}$$.

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