Chemical Engineering Mcqs

The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________?

(A) 1
(B) 2
(C) 3
(D) 4

Submitted By :Ali Uppal

Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ?

(A) Mercury in glass thermometer
(B) Alcohol in glass thermometer
(C) Fused metal (Na or K) in steel thermometer
(D) Nitrogen in steel thermometer

Submitted By :Ali Uppal

Working principle of mercury in glass thermometer is__________________?

(A) Volumetric expansion
(B) Pressure rise with temperature
(C) Linear expansion
(D) None of these

Submitted By :Ali Uppal

In a closed loop system, the process to be controlled is an integrating process with transfer function 1/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit__________________?

(A) Overdamped response
(B) Underdamped response
(C) Undamped response
(D) Unstable response

Submitted By :Ali Uppal

A typical example of a physical system with under damped characteristic is a____________________?

(A) U-tube manometer
(B) Spring loaded diaphragm valve
(C) CSTR with first order reaction
(D) Thermocouple kept immersed in a liquid filled thermowell

Submitted By :Ali Uppal

The time taken for a radioactive element to reduce to 50% of its original weight is _____________ years, if its half life period is 12 years?

(A) 24
(B) 18
(C) 6
(D) 36

Submitted By :Ali Uppal

Heavy water is preferred over ordinary water as a coolant, because it?

(A) Acts both as an efficient coolant as well as a moderator
(B) Can be heated to a higher temperature without pressurizing
(C) Is less prone to radiation damage
(D) All

Submitted By :Ali Uppal

An ideal coolant for a nuclear reactor should ________________?

(A) Be a good absorber of neutrons
(B) Be capable of attaining high temperature, only when it is pressurised
(C) Have high density, but low heat transfer co-efficient
(D) Be free from radiation damage and non-corrosive

Submitted By :Ali Uppal

The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235, followed by nuclear fission is __________________?

(A) 1
(B) 2
(C) 3
(D) 4

Submitted By :Ali Uppal

The frequency at which maximum amplitude ratio is attained is called the ______________ frequency?

(A) Corner
(B) Resonant
(C) Cross-over
(D) Natural

Submitted By :Ali Uppal

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