Model Questions for SSC Junior Engineer EXAM - Mechanical Engg Set-5

1. Discharge of a centrifugal pump is

A. directly proportional to (diameter)2 of its impeller
B. inversely proportional to diameter of its impeller
C. inversely proportional to (diameter)2 of its impeller
D. directly proportional to diameter of its impeller

2. Which of the following statement is wrong?

A. The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy.
B. The length of divergent portion in a venturimeter is equal to the convergent portion.
C. A flow whose streamline is represented by a curve, is called two dimensional flow.
D. A pitot tube is used to measure the velocity of flow at the required point in a pipe.

3. A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is

A. 1.75 kW
B. 3.75 kW
C. 0.75 kW
D. 0.25 kW

4. The loss of pressure head in case of laminar flow is proportional to

A. (velocity)4
B. (velocity)2
C. (velocity)3
D. velocity

5. In a Kaplan turbine runner, the number of blades are generally between

A. 8 to l6
B. 2 to 4
C. 16 to 24
D. 4 to 8

Study Kit for SSC Junior Engineer EXAM (Paper-1) 2017-2018

6. The discharge over a triangular notch is

A. inversely proportional to H5/2
B. inversely proportional to H3/2
C. directly proportional to H5/2
D. directly proportional to H3/2

7. The mechanical efficiency of an impulse turbine is

A. ratio of the Work done on the wheel to the energy of the jet
B. ratio of the actual work available at the turbine to the energy imparted to the wheel
C. ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
D. none of the above

8. Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.

A. diameter
B. square of diameter
C. cube of diameter
D. fourth power of diameter

9. A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is

A. 9.28 kN
B. 28.9 kN
C. 8.29 kN
D. 2.89 kN

10. The flow of water through the hole in the bottom of a wash basin is an example of

A. free vortex
B. forced vortex
C. uniform flow
D. steady flow

Study Kit for SSC Junior Engineer EXAM (Paper-1) 2017-2018

Answer

1. (C) 2. (B) 3. (A) 4. (D) 5. (D) 6. (C) 7. (B) 8. (D) 9. (C) 10. (A)