List of practice Questions

Given below are two statements:
Statement (I): The heat transfer coefficient for air in free convection varies between 5 to 30 W/m²·K.
Statement (II): The heat transfer coefficient of steam during condensation lies between 5000 to 110000 W/m²·K.
In light of the above statements, choose the most appropriate answer from the options given below.

The shape factor of a hemispherical body placed on a flat surface with respect to itself is

Given below are two statements one is labelled as Assertion A and the other one labelled as Reason R

Match List I (Non-Dimensional Number) with List II (Formula):

LIST I	LIST II
A. Nusselt Number	I. \( \mu C_p / k_f \) (where \( k_f \) is thermal conductivity of fluid)
B. Biot Number	II. \( hL / k_s \) (where \( k_s \) is thermal conductivity of solid)
C. Prandtl Number	III. \( h / \rho C_p \)
D. Stanton Number	IV. \( hL / k_f \) (where \( k_f \) is thermal conductivity of fluid)

Choose the correct answer from the options given below.

Lumped Heat capacity analysis can be applied to a system when

Consider the following statements about the flow in a convergent-divergent nozzle operating under design conditions:

1. In the divergent section, pressure is higher than the pressure in the convergent section.
2. The pressure at the throat is equal to critical pressure.
3. The pressure in the convergent section reduces.
4. The flow is subsonic in the convergent section and supersonic in the divergent section.

Choose the correct answer from the options given below.

Given below are two statements:
Statement (A): The flow in a pipe is turbulent when the Reynolds’ Number is more than 4000.
Statement (R): The flow in a pipe is turbulent at entry and slowly changes to laminar along the length of the pipe.
In light of the above statements, choose the correct answer from the options given below:

Match List I (Non-dimensional number) with List II (It is the ratio of):

LIST I	LIST II
A. Reynold’s Number	III. Inertia force to viscous force
B. Mach Number	I. Inertia force to elastic force
C. Froude’s Number	II. Inertia force to gravity force
D. Weber’s Number	IV. Inertia force to surface tension force

Choose the correct answer from the options given below:

The vacuum in a closed container is 50 mm of Hg The absolute pressure in the container is

Which of the following is correct?

The complementary function of the differential equation \( y'' + 16y = x \sin px, \, p = 4, \) is given by:

The first-order partial derivative of the function \( \log(\sin x + \cos y) \) with respect to the variables \( x \) and \( y \), respectively, are given by:

Which of the following is not correct?

If the function \( f(z) = x^2 + axy + by^2 + i(cx^2 + dxy + y^2) \) is analytic, then the values of \( a, b, c, \) and \( d \) are given by:

The catalyst used during the condensation of phenol and formaldehyde to obtain the highest electrical properties is:

For the manufacture of Nylon-6 by condensation polymerization of caprolactam, the temperature maintained in the reactor is about:

The kinetics and degree of polymerization of polymer during emulsion polymerization depends upon:

The polymer —A–A–A–B–B—AAA—B-——-B represents:

Polymer having high tensile strength, tensile modulus, stiffness, melting point, and heat distortion temperature combined with low specific gravity and excellent resistance to environmental stress cracking is:

Self-polymerization of reactive styrene at room temperature can be prevented by the addition of:

Diglycidyl ether of bisphenol-A and 4,4-diamino diphenyl sulfone system can be used to obtain glass-reinforced composites by the process of:

In extrusion, the primary function of the transition zone is to:
A. compress the polymer
B. melt the polymer
C. support the screen pack
D. contribute for he back pressure

Bicycle pedal is an example of:

The characteristic that deteriorates when more styrene is added to butadiene to get SBR during polymerization is: