Explore topic-wise MCQs in Thermodynamics.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.

1.

The Bernoulli equation is restricted to _____ fluids but the SFEE is valid for _____ fluids as well.

A. viscous compressible, frictionless incompressible
B. frictionless incompressible, viscous compressible
C. viscous incompressible, frictionless compressible
D. none of the mentioned
Answer» C. viscous incompressible, frictionless compressible
Discussion
2.

For an inviscid frictionless fluid flowing through a pipe, Euler equation is given by

A. Vdp+VdV+gdZ=0
B. Vdp-VdV+gdZ=0
C. Vdp-VdV-gdZ=0
D. none of the mentioned
Answer» B. Vdp-VdV+gdZ=0
Discussion
3.

A heat exchanger is a device in which heat is transferred from one fluid to another.

A. true
B. false
Answer» B. false
Discussion
4.

For an adiabatic compressor or pump,

A. the enthalpy of fluid remains constant with the amount of work input
B. the enthalpy of fluid decreases by the amount of work input
C. the enthalpy of fluid increases by the amount of work input
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
5.

A_HEAT_EXCHANGER_IS_A_DEVICE_IN_WHICH_HEAT_IS_TRANSFERRED_FROM_ONE_FLUID_TO_ANOTHER.?$

A. true
B. false
Answer» B. false
Discussion
6.

The Bernoulli equation is restricted to _____ fluids but the SFEE is valid for _____ fluids as well.$

A. viscous compressible, frictionless incompressible
B. frictionless incompressible, viscous compressible
C. viscous incompressible, frictionless compressible
D. none of the mentioned
Answer» C. viscous incompressible, frictionless compressible
Discussion
7.

For_an_inviscid_frictionless_fluid_flowing_through_a_pipe,_Euler_equation_is_given_by$

A. Vdp+VdV+gdZ=0
B. Vdp-VdV+gdZ=0
C. Vdp-VdV-gdZ=0
D. none of the mentioned
Answer» B. Vdp-VdV+gdZ=0
Discussion
8.

For an adiabatic compressor or pump?

A. the enthalpy of fluid remains constant with the amount of work input
B. the enthalpy of fluid decreases by the amount of work input
C. the enthalpy of fluid increases by the amount of work input
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
9.

For a turbine, it is seen that work is done by the fluid at the expense of its enthalpy.

A. true
B. false
Answer» B. false
Discussion
10.

Turbines and engines ____ positive power output, and compressors and pumps ____ power input.

A. require, give
B. give, require
C. give, give
D. require, require
Answer» C. give, give
Discussion
11.

In a throttling device, what do we get as SFEE when changes in PE and KE are taken zero?

A. dQ/dm≠0
B. dW/dm≠0
C. h1=h2
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
12.

Fluid flow through which of the following throttles the flow?

A. partially opened valve
B. orifice
C. porous plug
D. all of the mentioned
Answer» E.
Discussion
13.

For an insulated nozzle, SFEE of the control surface gives ( considering change in PE is zero and inlet velocity is small compared to exit velocity)

A. V2=sqrt(4*Δh)
B. V2=sqrt(Δh)
C. V2=sqrt(Δh/2)
D. V2=sqrt(2*Δh)
Answer» E.
Discussion
14.

What does a diffuser do?

A. increases the pressure of the fluid at the expense of its KE
B. decreases the pressure of the fluid and also increases its KE
C. increases the pressure of the fluid and also its KE
D. decreases the pressure of the fluid and also its KE
Answer» B. decreases the pressure of the fluid and also increases its KE
Discussion
15.

What does a nozzle do?

A. decreases the velocity of a fluid at the cost of its pressure gain
B. increases the velocity of a fluid at the cost of its pressure drop
C. increases the velocity of a fluid and also its pressure
D. none of the mentioned.
Answer» C. increases the velocity of a fluid and also its pressure
Discussion