Chemical Engineering Basics

Question: Which of the following transducers is most commonly used for the measurement of shock and vibration ?
[A].

Linear variable differential transducer (LVDT)

[B].

Dial gauge

[C].

Accelerometer

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: For dynamic strain measurement, the wheatstone bridge used is of __________ type.
[A].

voltage sensitive null

[B].

voltage sensitive deflected

[C].

current sensitive deflected

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ circuit is most commonly used to measure strain with the help of a strain gauge.
[A].

Ballast

[B].

Voltage balancing potentiometric

[C].

Simple current sensitive

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Angular displacement can be measured suitably by a
[A].

shaft encoder.

[B].

linear variable differential transducer (LVDT).

[C].

stroboscope.

[D].

tachometer.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Cascade control is
[A].

the continuous adjustment of the set point index of an automatic control loop by a primary (master) controller.

[B].

used when changes in process conditions cause serious upsets in the controlled variable.

[C].

useful to control flow from temperature.

[D].

all ‘a’, ‘b’ & ‘c’.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Floating control action
[A].

moves the final control element at constant speed in either direction in response to an error signal.

[B].

changes the position of the final control element from on to off.

[C].

is used to counteract rapid load changes.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: On-off control
[A].

fully opens the final control element, when the measured variable is below the set point.

[B].

fully closes the final control element, when the measured variable is above the set point.

[C].

is a two position control (fully open or fully closed) control adequate to control a process with slow reaction and minimum dead time or transfer lag.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: A controller action in which there is a con-tinous relation between the values of controlled variable and the rate of change of conrolled output signal is called the __________ action.
[A].

proportional

[B].

integral

[C].

derivative

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Difference at any instant between the value of the controlled variable and the set point is called the
[A].

deviation

[B].

derivative time

[C].

error ratio

[D].

differential gap

Answer: Option A

Explanation:

No answer description available for this question.

Question: Device used as a standard for the calibration of pressure gauges is a
[A].

bellow

[B].

diaphragm

[C].

dead weight pressure tester

[D].

mercury manometer

Answer: Option C

Explanation:

No answer description available for this question.