Process Control and Instrumentation

91. Hot wire anemometer is used for the measurement of

  1. Flow rates of fluids
  2. Flow rates of granular solids
  3. Very high temperature
  4. Thermal conductivity of gases

Correct answer: (A)
Flow rates of fluids

92. Humidity of air can be determined by a

  1. Chromatograph
  2. Sling psychrometer
  3. Mass spectrometer
  4. Polarimeter

Correct answer: (B)
Sling psychrometer

93. Identify an unbounded input from inputs whose transfer functions are given below

  1. 1
  2. 1/S
  3. 1/S2
  4. 1/(S2 + 1)

Correct answer: (C)
1/S2

94. If response of a control system is to be free of offset and oscillation, the most suitable controller is

  1. Proportional controller
  2. Proportional-derivative (PD) controller
  3. Proportional-integral (PI) controller
  4. Proportional integral-derivative (PID) controller

Correct answer: (D)
Proportional integral-derivative (PID) controller

95. 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

  1. Overdamped response
  2. Underdamped response
  3. Undamped response
  4. Unstable response

Correct answer: (B)
Underdamped response

96. In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

  1. G/(1 + H)
  2. H/(1 + G)
  3. G/H
  4. H/G

Correct answer: (B)
H/(1 + G)

97. In a second order under damped system, the

  1. Time required for the response of first reach its ultimate value is called the response time
  2. Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient
  3. Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot
  4. None of these

Correct answer: (B)
Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient

98. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the _________ variable.

  1. Load
  2. Controlled
  3. Manipulated
  4. None of these

Correct answer: (C)
Manipulated

99. In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the _________ variable.

  1. Load
  2. Manipulated
  3. Controlled
  4. None of these

Correct answer: (A)
Load

100. In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the _________ variable.

  1. Load
  2. Manipulated
  3. Controlled
  4. None of these

Correct answer: (C)
Controlled

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