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Process Control and Instrumentation Online Exam Quiz

Important questions about Process Control and Instrumentation. Process Control and Instrumentation MCQ questions with answers. Process Control and Instrumentation exam questions and answers for students and interviews.

The transfer function for a PID controller is (where, ?? is the integral (reset) time and ?D is the derivative time.)

Options

A : a. A

B : b. B

C : c. C

D : d. D

The symbol for "capillary line" in instrumentation diagram is

Options

A : a. A

B : b. B

C : c. C

D : d. D

What is the overall transfer function (C/R) of the following block diagram if G = G?. G?. G? and H = H?.H?.

Options

A : a. A

B : b. B

C : c. C

D : d. D

Transfer functions X/Y for which of the following block diagrams is

Options

A : a. A

B : b. B

C : c. C

D : d. D

The transfer function for a first order process with time delay is

Options

A : a. A

B : b. B

C : c. C

D : d. D

An ideal PID controller has the transfer function [1 + 1/0.55 + 0.25 ]. The frequency at which the magnitude ratio of the controller is 1, is

Options

A : a. A

B : b. B

C : c. C

D : d. D

The unit step response of the following transfer function reaches its final steady state assymptotically after

Options

A : a. a monotonic increase.

B : b. a monotonic decrease.

C : c. initially increasing and then decreasing.

D : d. increasing decreasing and then increasing.

A process is initially at steady state with its output y=1 for an input u=1. The input is suddenly changed to 2 at time t=0. The output response is y(t)=1+2t. The transfer function of the process is

Options

A : a. A

B : b. B

C : c. C

D : d. D

For the block diagram shown below, the characteristic equation is

Options

A : a. A

B : b. B

C : c. C

D : d. D

The experimental response of the controlled variable y(t) for a step change of magnitude P in the manipulated variable x(t) is shown below. The appropriate transfer function of the process is

Options

A : a. A

B : b. B

C : c. C

D : d. D

The open loop transfer function of a process is given below. In the root locus diagram, the poles will be at

Options

A : a. -1, -4

B : b. 1, 4

C : c. -2, -3

D : d. 2, 3

Water is entering a storage tank at a temperature T? and flow rate Q? and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A?. The model that describes the dynamic variation of temperature of water in the tank with time is given as :

Options

A : a. A

B : b. B

C : c. C

D : d. D

The Laplace transform of a sinusoidal function (eg; sin at) is represented by the curve

Options

A : a. A

B : b. B

C : c. C

D : d. D

Pick out the symbol for "locally mounted instrument" in instrumentation diagram.

Options

A : a. A

B : b. B

C : c. C

D : d. D

Block diagram of a simple standard control system is shown below in the figure. Which of the following statement about the above control system is wrong ?

Options

A : a. A

B : b. B

C : c. C

D : d. D

Which is the symbol for "pneumatic control valve" ?

Options

A : a. A

B : b. B

C : c. C

D : d. D

Find the Laplace transform of the following input function shown in figure.

Options

A : a. A

B : b. B

C : c. C

D : d. D

A control system has the following transfer function. The initial value of the corresponding time function is

Options

A : a. 1

B : b. 1/8

C : c. 7/8

D : d. -1

For the time domain function f(t) = t, the Laplace transform of following equation is given by

Options

A : a. 1/2 S³

B : b. 2/S³

C : c. 1/S³

D : d. 2/S²

The characteristic equation for the control system with a closed loop transfer function G?/1 + G? is given by 1 + G? = 0. The characteristic equation for the control system

Options

A : a. depends only upon the open loop transfer function.

B : b. determines its stability.

C : c. is the same for set point or load changes.

D : d. all 'a', 'b' & 'c'

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