List of top Chemical, Thermal and Polymer Engineering Questions

Which of the following is correct?

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

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

Bicycle pedal is an example 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

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

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:

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

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

In a flow-nozzle type flow meter, the contraction is noticed to be:
A. gradual
B. abrupt
C. no change
D. discrete

The lower limit of the useful working range of a transducer is determined by its:
A. error
B. noise
C. accuracy
D. stability

The effect of smoke in the preparation of smoked rubber sheet is:
A. to make the rubber brown
B. to serve as a preservator
C. to make the rubber soft
D. to make the rubber blistering

Tubeless tyres can be made from:

Dynamic response of a system consists of:
A. steady state response only
B. transient state response only
C. unsteady state response only
D. non-transient state response only

Microprocessor-based systems which are increasingly being used for dedicated applications in process instrumentation are:

Routh test criterion:
A is applicable only to those systems with polynomial characterizatic equation
B. does not prove any information about the actual location of roots
C. is applicable only to those systems with non-polynomial characterizatic equation
D. Gives full information about the actual location of roots