Online Chemical Engineering Test - Process Control and Instrumentation Test 2

Instruction:

  • This is a FREE online test. Beware of scammers who ask for money to attend this test.
  • Total number of questions: 20.
  • Time allotted: 30 minutes.
  • Each question carries 1 mark; there are no negative marks.
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  • All the best!

Marks : 2/20


Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.

1.
Flow rate of a river is measured by a/an
pitot tube
vane meter
kennison nozzle
open weir
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2.
Range of hydrogen gas constant volume themometer is __________ °C.
-10 to 20
0 to 100
100 - 500
400 - 1000
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3.
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.
no change
decrease
increase
exponential decrease
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4.
The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system
depends only upon the open loop transfer function.
determines its stability.
is the same for set point or load changes.
all 'a', 'b' & 'c'
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5.
In a second order under damped system, the
time required for the response of first reach its ultimate value is called the response time.
overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e.
decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot.
characteristics of a step response is represented by
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6.
Which of the following is not a differential pressure flow meter ?
Rotameter
Flow nozzle
Orificemeter
Venturimeter
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7.
A bolometer is
used for the measurement of thermal radiation.
an element which senses optical input and delivers thermal output.
both (a) & (b).
neither (a) nor (b).
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8.
The offset introduced by proportional controller with gain Kcin response of first order system can be reduced by
reducing value of Kc.
introducing integral control.
introducing derivative control.
none of the above.
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9.
The inverse Laplace transform of the function is
1 + et
1 - et
1 + e-t
1 - e-t
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10.
Water is entering a storage tank at a temperature T0 and flow rate Q0 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 A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as :
Q0(T0 - T) = Ac .
Q0T0 - QT = Ac .
Q(T0 - T) = Ac .
Q(T0 - T) = Ac .
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11.
Which of the following flow-metering instru-ments is an areameter ?
Venturimeter
Rotameter
Pitot tube
Hot wire anemometer
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12.
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?
Nickel
Brass
Chromel
Invar
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13.
Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.
radiation
optical
photoelectric
none of these
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14.
__________ is the static characteristics of an instrument,
Response
Tine lag
Drift
dynamic error
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15.
Which is the most suitable instrument for measuring pressure below 3 microns ?
Mcleoid gauge
Alphatron
Ionisation gauge
Bourdon guage
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16.
Which of the following thermocouples is capable of measuring a temperature of -50°C?
Platinum - platinum + rhodium
Chromel - alumel
Iron-constantan
Copper - constantan
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17.
For measuring the temperature of a red hot furnace, which is the most suitable instrument ?
Platinum resistance thermometer
Thermocouple
Optical pyrometer
Bimetallic thermometer
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18.
Pick out the wrong statement.
There is no transfer lag for a single first order system.
Stirred tank with a water jacket exemplifies an interacting system.
Transfer lag is a characteristics of all higher order systems (other than first order systems).
Transfer lag decreases as the number of stages decreases.
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19.
The thermal emf-temperature relationship of most thermocouples is
linear
parabolic
exponential
square root
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20.
Which is the strongest paramagnetic gas?
CO2
O2
NO
NO2
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