SSC JE Mechanical Engineering 29th Jan 2018 Shift-1

Instructions

For the following questions answer them individually

Question 181

If the flow parameters change with time it is known as

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Question 182

The coefficient of lift at stall point is

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Question 183

Hydraulic jump is a phenomenon occurring in

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Question 184

Pelton wheel is a

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Question 185

The unit speed of a turbine is equal to
(a) $$\frac{N}{\sqrt{H}}$$
(b) $$\frac{\sqrt{H}}{N}$$
(c) $$N\sqrt{H}$$
(d) $$\frac{2N}{\sqrt{H}}$$

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Question 186

The flow within the boundary layer is

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Question 187

Consider the following statements regarding Bernoulli’s theorem for fluid flow
1. Conservation of energy
2. Steady flow
3. Viscous flow
4. Incompressible flow
Which of the above statements is/are correct?

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Question 188

Why is an air vessel used in a reciprocating pump?

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Question 189

Consider the following statements pertaining to specific speed of turbo machines:
1. Specific speed varies with shape of the runner and other parts of the machine.
2. Machines with higher specific speeds are limited to low heads.
3. Specific speed is dimensionless .and is independent of variation of type of fluid used.
Which of the statements given above are correct?

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Question 190

The velocity of a water stream is being measured by a L- Shaped pitot-tube and the readings is 20 cm. Then, what is the approximate value of velocity?

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