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Free download in PDF Turbomachines Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
The product of force (F) and time (t) is called as________.
[A]
momentum
[B]
work done
[C]
impulse
[D]
pressure
(22)
What is the formula for forces exerted by fluid on a body?
[A]
(Rate of momentum in) x (Rate of momentum out)
[B]
(Rate of momentum in) – (Rate of momentum out)
[C]
(Rate of momentum in) + (Rate of momentum out)
[D]
None of the above
Answer: (Rate of momentum in) – (Rate of momentum out)
(23)
The radial force in rotodynamic machine, which is developed by rate of change of momentum in radial velocity, is taken care by__________.
[A]
journal bearing
[B]
radial thrust bearing
[C]
both a. and b.
[D]
none of the above
(24)
Meridonial velocity is the resultant of _____________ components of fluid velocity.
[A]
radial and tangential
[B]
tangential and axial
[C]
radial and axial
[D]
unpredictable
(25)
_______________ components of fluid velocity have the responsibility of the transportation of fluid through the machine.
[A]
Radial and tangential
[B]
Tangential and axial
[C]
Radial and axial
[D]
None of the existing
(26)
In which turbine the pressure energy of water is first converted into kinetic energy by means of nozzle kept close to the runner?
[A]
Impulse turbine
[B]
Reaction turbine
[C]
Both a. and b.
[D]
None of the above
(27)
The pressure of water is atmospheric and remains constant while passing over the runner in __________ .
[A]
Impulse turbine
[B]
Reaction turbine
[C]
Both a. and b.
[D]
None of the above
(28)
The energy of water entering the reaction turbine is _______
[A]
fully the kinetic energy
[B]
fully the pressure energy
[C]
partly the pressure energy and partly the kinetic energy
[D]
unpredictable
Answer: partly the pressure energy and partly the kinetic energy
(29)
Which of the following is an example of impulse turbine?
[A]
Propeller turbine
[B]
Francis turbine
[C]
Kaplan turbine
[D]
Pelton wheel
(30)
The runner of __________ turbine always be under pressure of above atmospheric
[A]
Turgo
[B]
Girand
[C]
Kaplan
[D]
None of the above
31
The water from runner in reaction turbine is discharged into tail race through a draft tube which has ____________ cross sectional area.
[A]
constant
[B]
gradually decreasing
[C]
gradually increasing
[D]
uneven
Answer: gradually increasing
32
__________ turbines are also called as parallel flow turbine.
[A]
Radial flow
[B]
Axial flow
[C]
Both radial flow and axial flow
[D]
None of the above
33
In which type of reaction turbine does the water flow in radial direction at the outer periphery of runner and leave at the centre in the direction parallel to the axis of rotation of runner?
[A]
Radial flow turbine
[B]
Axial flow turbine
[C]
Mixed flow turbine
[D]
All of the above
Answer: Mixed flow turbine
34
What is the formula to calculate specific speed (Ns) of a turbine rotating at a speed of 'N' rpm that develops the power of 'P' kW at the heat of 'H' m?
[A]
(Ns) = (√N x P) x (H)(5/4)
[B]
(Ns) = (2 √N x P) x (H)(5/4)
[C]
(Ns) = (N √P) x (H)(5/4)
[D]
(Ns) = (2N √P) x (H)(5/4)
Answer: (Ns) = (N √P) x (H)(5/4)
35
Generally, the value of specific speed of Kaplan turbine is _____________ that of the Pelton turbine.
[A]
lower than
[B]
higher than
[C]
same as
[D]
unpredictable
36
The passage of uniformly varying cross-section in which the kinetic energy of steam increases at the expense of its pressure is called as__________
[A]
steam turbine
[B]
steam nozzle
[C]
steam area
[D]
all of the above
37
The nozzle efficiency can be defined as the ratio of
[A]
isentropic enthalpy drop to actual enthalpy drop
[B]
actual enthalpy drop to isentropic enthalpy drop
[C]
isothermal enthalpy drop to isentropic enthalpy drop
[D]
isentropic enthalpy drop to isothermal enthalpy drop
Answer: actual enthalpy drop to isentropic enthalpy drop
38
The quality of vapour at the exit of nozzle ___________ due to nozzle friction.
[A]
increases
[B]
decreases
[C]
does not change
[D]
unpredictable
39
Pump transfers the mechanical energy of a motor or of an engine into _________ of a fluid.
[A]
pressure energy
[B]
kinetic energy
[C]
either pressure energy or kinetic energy
[D]
pressure energy, kinetic energy or both
Answer: pressure energy, kinetic energy or both
40
Which of the following is NOT a type of positive displacement pumps?
[A]
Reciprocating pump
[B]
Rotary displacement pump
[C]
Centrifugal pump
[D]
None of the above
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