SSC JE Mechanical Engineering 29th Jan 2018 Shift-1

Instructions

For the following questions answer them individually

Question 191

Which of the following water turbines maintain a high efficiency over a long range of the, part load?
1. Francis turbine
2. Kaplan turbine
3. Pelton turbine
4. Propeller turbine

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Question 192

The components of velocity in a two-dimensional frictionless incompressible, flow are:
$$u=t^{2}+3y$$ and $$v=3t+3x$$ What is the approximate resultant total acceleration at the point (3, b: and t = 2?

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Question 193

A centrifugal pump needs 1000 W of power when operating at 1500 rpm. What is the power requirement if, the speed of the pump is increased to 3000 rpm?

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Question 194

The flow in which conditions do not change with time at any point, is known as

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Question 195

Uniform flow occurs when

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Question 196

In a centrifugal pump casing, the flow of water leaving the impeller, is

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Question 197

The given figure below shows the curves between Head (H) and Flow (Q) for centrifugal pump impeller with different impeller vane exit angles

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Question 198

The figure given below shows the relationship between power (P) and discharge (Q) for different vane exit angles of centrifugal pump. Curve A holds good for.

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Question 199

Specific speed of turbine indicated as
A) $$\frac{N\sqrt{Q}}{H^\frac{3}{4}}$$
B) $$\frac{N\sqrt{P}}{H^\frac{5}{4}}$$
C) $$\frac{N\sqrt{Q}}{H^\frac{2}{3}}$$
D) $$\frac{N\sqrt{P}}{H^\frac{3}{2}}$$

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Question 200

If α is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse turbine is

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