The Spalart-Allmaras model differs from the RANS equations by ___________

The k-ω model adds ___________ to the RANS equations.

A

three variables

B

three equations

C

two variables

D

two equations

The Weberian model of bureaucracy has been criticised from a variety of stand points.
Consider the following points in this regard:
1. The Weberian model appears to be a 'machine theory' and a closed system model taking little account of organisational interactions with the environment.
2. The structural features of bureaucracy as laid down by Weber might be suitable for routine and repetitive tasks but these would produce dysfunctional consequences in terms of human behaviour if the jobs would involve innovation and creativity.
3. Weberian model has not been found to respond adequately to the tasks of socioeconomic transformation in the developing countries. These tasks require quick changes whereas the capacity of the Weberian model for adaptation to change is rather slow.
4. Weber's model is confined to the study of formal bureaucratic structure and fails to take notice of the informal structure of bureauracy such as informal relations, informal norms and values, an informal power hierarchy and informal power struggles.
Which of the above points make a valid criticism of the Weberian model? Select the correct answer from below:

A

1 and 3

B

2 and 3

C

1, 2 and 3

D

1, 2, 3 and 4

Which of these terms arise in the conservation equations when using the RANS model?

A

Reynolds stresses and turbulent scalar flux

B

Cross stresses and turbulent scalar flux

C

Leonard stresses and turbulent scalar flux

D

Leonard stresses and cross stresses

What is the difference between the RANS model and the Reynolds stress model?

A

The RANS model needs 5 extra transport equations

B

The Reynolds stress model needs 5 extra transport equations

C

The RANS model needs 7 extra transport equations

D

The Reynolds stress model needs 7 extra transport equations

To close the RANS equations, we need _____________

A

Incompressible flow model

B

DNS method

C

Turbulence models

D

SGS model

Though the applicability of the realizable k-ε model and the RNG k-ε model are almost the same, the realizable k-ε model is ___________ when compared to the RNG k-ε model.

A

more accurate and converges easily

B

more stable

C

linear

D

more consistent

In the following question, two statements are given each followed by two conclusions I and II. You have to consider the statements to be true even if theyseem to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statements:
(I) Some polynomials are linear equations.
(II) Some linear equations are quadratic. Conclusion:
(I) Polynomials are quadratic.
(II) Linear equations are quadratic.

A

Conclusion I follows

B

Conclusion II follows

C

Neither I nor II follows

D

Both I and II follows

The figure shows the plot of y as a function of x
Differential Equations mcq question image

The function shown is the solution of the differential equation (assuming all initial conditions to be zero) is

A

$$\frac{{{{\text{d}}^2}{\text{y}}}}{{{\text{d}}{{\text{x}}^2}}} = 1$$

B

$$\frac{{{\text{dy}}}}{{{\text{dx}}}} = {\text{x}}$$

C

$$\frac{{{\text{dy}}}}{{{\text{dx}}}} = - {\text{x}}$$

D

$$\frac{{{\text{dy}}}}{{{\text{dx}}}} = \left| {\text{x}} \right|$$

The averaging interval in RANS equation is based on ____________

A

the grid size

B

the eddy size

C

the fluctuations

D

the time interval of the problem

Which of these models is a hybrid of LES and RANS?

A

DNS model

B

DES model

C

WALE model

D

RNG – LES model

The Spalart-Allmaras model differs from the RANS equations by ___________

Related Questions