Online Mechanical Engineering Test - Hydraulic Machines Test

Instruction:

  • This is a FREE online test. Beware of scammers who ask for money to attend this test.
  • Total number of questions: 20.
  • Time allotted: 30 minutes.
  • Each question carries 1 mark; there are no negative marks.
  • DO NOT refresh the page.
  • All the best!

Marks : 2/20


Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.

1.
In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.
True
False
Your Answer: Option
(Not Answered)
Correct Answer: Option

2.
In a Kaplan turbine runner, the number of blades are generally between
2 to 4
4 to 8
8 to l6
16 to 24
Your Answer: Option
(Not Answered)
Correct Answer: Option

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
0.25 kW
0.75 kW
1.75 kW
3.75 kW
Your Answer: Option
(Not Answered)
Correct Answer: Option

4.
Which of the following turbine is preferred for 0 to 25 m head of water?
Pelton wheel
Kaplan turbine
Francis turbine
none of these
Your Answer: Option
(Not Answered)
Correct Answer: Option

5.
The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as
manometric efficiency
mechanical efficiency
overall efficiency
volumetric efficiency
Your Answer: Option
(Not Answered)
Correct Answer: Option

6.
Discharge of a centrifugal pump is
directly proportional to diameter of its impeller
inversely proportional to diameter of its impeller
directly proportional to (diameter)2 of its impeller
inversely proportional to (diameter)2 of its impeller
Your Answer: Option
(Not Answered)
Correct Answer: Option
Explanation:

Discharge of a centrifugal pump is directly proportional to (Diameter)^2 of its impeller.

Head of a centrifugal pump is directly proportional to (Diameter)^2 of its impeller.

Power Developed of a centrifugal pump is directly proportional to (Diameter)^4 of its impeller.


7.
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
slow speed with radial flow at outlet
medium speed with radial flow at outlet
high speed with radial flow at outlet
high speed with axial flow at outlet
Your Answer: Option
(Not Answered)
Correct Answer: Option

8.
When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.
Agree
Disagree
Your Answer: Option
(Not Answered)
Correct Answer: Option

9.
Geometric similarity is said to exist between the model and the prototype, if both of them
have identical velocities
are equal in size and shape
are identical in shape, but differ only in size
have identical forces
Your Answer: Option
(Not Answered)
Correct Answer: Option

10.
An impulse turbine is used for
low head of water
high head of water
medium head of water
high discharge
Your Answer: Option
(Not Answered)
Correct Answer: Option

11.
The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.
equal to
1.2 times
1.8 times
double
Your Answer: Option
(Not Answered)
Correct Answer: Option

12.
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 discharge of wheel is
0.25 m3/s
0.5 m3/s
1.5 m3/s
2.5 m3/s
Your Answer: Option
(Not Answered)
Correct Answer: Option

13.
The discharge through a reaction turbine __________ with the increase in unit speed.
remains same
increases
decreases
Your Answer: Option
(Not Answered)
Correct Answer: Option

14.
Overall efficiency of a centrifugal pump is the ratio of
energy available at the impeller to the energy supplied to the pump by the prime mover
actual workdone by the pump to the energy supplied to the pump by the prime mover
energy supplied to the pump to the energy available at the impeller
manometric head to the energy supplied by the impeller per kN of water
Your Answer: Option
(Not Answered)
Correct Answer: Option

15.
In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows.
Correct
Incorrect
Your Answer: Option
(Not Answered)
Correct Answer: Option

16.
A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure.
Correct
Incorrect
Your Answer: Option
(Not Answered)
Correct Answer: Option

17.
Manometric head is the actual head of water against which a centrifugal pump has to work.
Correct
Incorrect
Your Answer: Option
(Not Answered)
Correct Answer: Option

18.
Which of the following pump is sucessfully used for lifting water to the boilers?
Centrifugal pump
Reciprocating pump
Jet pump
Air-lift pump
Your Answer: Option
(Not Answered)
Correct Answer: Option

19.
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
slow speed pump with radial flow at outlet
medium speed pump with radial flow at outlet
high speed pump with radial flow at outlet
high speed pump with axial flow at outlet
Your Answer: Option
(Not Answered)
Correct Answer: Option

20.
The power of a centrifugal pump working under constant head and discharge increases with the speed.
True
False
Your Answer: Option
(Not Answered)
Correct Answer: Option

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