SSC JE Mechanical Engineering 29th Jan 2018 Shift-1

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

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?

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?

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

Uniform flow occurs when

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

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

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.

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) $$\frac{N\sqrt{P}}{H^\frac{3}{2}}$$

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