A jet of water issues from a nozzle with a velocity of 10 m/s and it impinges normally on a fixed flat plate. The cross sectional area of the jet is 0.02 m2 and the density of water is 1000 kg/m3 . What is the force developed on the plate?

The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m³, a = Cross-sectional area of jet in m² and V = Velocity of jet in m/s)

A

$$\frac{{{\text{waV}}}}{{2{\text{g}}}}$$

B

$$\frac{{{\text{waV}}}}{{\text{g}}}$$

C

$$\frac{{{\text{wa}}{{\text{V}}^2}}}{{2{\text{g}}}}$$

D

$$\frac{{{\text{wa}}{{\text{V}}^2}}}{{\text{g}}}$$

In the gate area for non-pressurized casting gating ratio a:b:c? (gating ratio = a: b: c where, a = cross-sectional area of sprue, b: cross-sectional area of runner, c = total cross-sectional area of ingates).

A

1:2:2

B

2:2:1

C

1:4:4

D

1:4:2

Steam issues from the nozzle with a velocity of 1000 m/s in a De Laval turbine. The nozzle angle is 20°, mean blade velocity is 350 m/s. The inlet and outlet angles of the blades are equal. The mass of the steam flowing through the turbine per second is 0.3 kg. Calculate the tangential force on the blades. Take blade velocity coefficient as 0.8.

A

451 N

B

256 N

C

318 N

D

196 N

Water, having a density of 1000 kg/m3, leave from a nozzle with a velocity of 10 m/s and the jet strikes a bucket mounted on a Pelton wheel. The wheel rotates at 10 rad/s. The mean diameter of the wheel is 1 m. The jet is split into two equal streams by the bucket, such that each stream is deflected by 120°, as shown in the figure. Friction in the bucket may be neglected. Magnitude of the torque exerted by the water on the wheel, per unit mass flow rate of the incoming jet, is

A

0 (N.m)/(kg/s)

B

1.25 (N.m)/(kg/s)

C

2.5 (N.m)/(kg/s)

D

3.75 (N.m)/(kg/s)

Select the phrase/connector from the given three options which can be used to form a single sentence from the two sentences given below, implying the same as expressed in the statement sentence. Social issues are distinguished from economic issues. Some issues have both social and economic aspects. 1. When some issues 2. However some issues 3. Whenever social issues

A

Only 1

B

Only 2

C

Only 3

D

Both 2 and 3

E

Both 1 and 3

Six flats A, B, C, D, E and F are located in two rows of three flats each. The flats in both the rows face each other. Flat D is diagonally opposite to flat C. Flat E is opposite to flat F, which is north facing. Flat C is 2nd to the left of A and both of flats are south facing. Which of the following flats is facing flat B?

A

C

B

A

C

D

F

A free jet of water of cross-sectional area 0.01 m² and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is

A

200 N

B

400 N

C

2000 N

D

4000 N

Two wires have the same material and have the same volume. However wire 1 had cross sectional area A and wire 2 has cross sectional area 3A. If the length of wire 1 increases by ∆x on applying force F, how much force is needed to stretch wire 2 by the same amount?

A

F

B

4F

C

6F

D

9F

The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is

A

$$\frac{{{\text{wa}}\left( {{\text{V}} - {\text{v}}} \right)}}{{2{\text{g}}}}$$

B

$$\frac{{{\text{wa}}\left( {{\text{V}} - {\text{v}}} \right)}}{{\text{g}}}$$

C

$$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{2{\text{g}}}}$$

D

$$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{\text{g}}}$$

An object X sinks in liquids P and Q but floats in liquid R. Which of the following conclusions can be made from these observations? A) Density of X is more than the density of P B) Density of X is less than the density of R C) Density of P is equal to the density of R D) Density of P is less than the density of R

A

A, B, C

B

A, B, D

C

B, C, D

D

A, C, D

A jet of water issues from a nozzle with a velocity of 10 m/s and it impinges normally on a fixed flat plate. The cross sectional area of the jet is 0.02 m2 and the density of water is 1000 kg/m3 . What is the force developed on the plate?

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