List of practice Questions

A thermo flask is

2 kg of air is contained in a closed system at a pressure of 2 bar and 0.5 m³. It undergoes an isobaric expansion till the final volume becomes 0.6 m³. The work transfer (in kJ) during the process is:

Given below are two statements, one is labelled as Assertion (A) and the other one labelled as Reason (R):
Assertion (A): The Clausius statement of second law of thermodynamics states that it is impossible to transfer heat from a body at low temperature to a body at high temperature without the aid of external work.
Reason (R): Heat always flows from low temperature to high temperature.
In light of the above statements, choose the correct answer from the options given below:

A system at 500 K receives 7200 kJ/min of heat from a source at 1000 K The ambient temperature is 300 K The system and source temperature remain constant during heat transfer The decrease in available energy due to heat transfer through finite temperature difference is

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:

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.

Lumped Heat capacity analysis can be applied to a system when

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

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

Let \( P(\alpha, \beta) \) be a point on the parabola \( y^2 = 4x \). If \( P \) also lies on the chord of the parabola \( x^2 = 8y \) whose midpoint is \( \left( 1, \frac{5}{4} \right) \), then \( (\alpha - 28)(\beta - 8) \) is equal to ______.

Which of the following is correct?

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

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

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

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:

Which of the following is not correct?

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:

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

Bicycle pedal is an example 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

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