Flow Measurement Objective Type Questions and Answers 1. For accurate operation, orifice plate flowmeters require a) Laminar flow b) Fully-developed turbulent flow c) Swirls and eddies in the flow stream d) Transitional flow Answer : Fully-developed turbulent flow 2. A flag flapping in the breeze illustrates what type of dynamic fluid effect? a) Cavitation b) Vortex shedding c) Transitional flow d) Coriolis effect Answer : Vortex shedding 3. A ∆P transmitter calibrated for a range of 0 to 100 ”H2O measures liquid flow through an orifice plate from 0 to 1200 GPH. Calculate the new calibration range for the transmitter if we desire to decrease the flow measurement range to 0 to 700 GPH, using the same orifice plate. a) 0 to 34.03” H2O b) 0 to 76.38” H2O c) 0 to 171.4” H2O d) 0 to 293.9” H2O Answer : 0 to 34.03” H2O 4. Identify which of the following flowmeters inherently measures mass flow rate a) Thermal b) Magnetic c) Flow nozzle d) Vortex Answer : Thermal 5. As an incompressible flu

  Pressure Regulators Multiple Choice Questions 1. The measuring element _______________ a) Measures the inlet flow b) Measures the outlet flow c) Compares the inlet flow to the outlet flow d) None of the above Answer: Compares the inlet flow to the outlet flow 2. A pressure regulator includes? a) restricting element b) loading element c) measuring element d) All of the above Answer: All of the above 3. Regulators are used for? a) Gases b) Liquid c) Solid d) Both a and b Answer: Both a and b 4. _____________ regulators are two regulators in series in the same housing that operate to reduce the pressure progressively in two steps instead of one. a) One stage b) Two stage c) Three stage d) Four stage Answer: Two stage 5. Restricting element in a pressure regulator can be _________ a) Globe valve b) Poppet valve c) Butterfly valve d) All of the above Answer: All of the above 6. In pressure regulators load flow is ___________ proportional to regulator flow a) depends b) indirectly c) direc

  Control Loops Multiple Choice Questions 1. The most common analog signal standard for industrial process instruments is 4 to 20 _________ a) milliamps DC b) amps AC c) volts d) milliamps Answer: milliamps DC 2. Which of the following is not a “final control element”? a) A pressure transmitter b) An electric motor c) A heating element d) A control valve Answer : A pressure transmitter 3. Identify which of the following is an example of a “primary sensing element”  a) I/P transducer b) Instrument signal cable c) Control valve d) Diaphragm Answer : Diaphragm 4. A basic control loop will consist of __________ a) signal converter, resistor, knob, and control valve b) transducer, valve packing, hex-head wrench, and tubing c) transmitter, controller, I/P transducer, and control valve d) resistor, capacitor, terminal block, and battery Answer : transmitter, controller, I/P transducer, and control valve 6. The purpose of a “shield” wire on an instrument signal cable is to __________ a) Hold a

  Dynamic behaviour of first order and second order systems Objective Questions and Answers 1. In a second order system, the damping factor is 0.65 and the natural frequency is 4 Hz. If the stiffness of springs is halved, the new values of damping factor and natural frequency are _______ a) 0.92, 2.83 Hz b) 0.46, 5.66 Hz c) 0 92, 5.66 Hz d) 0.46, 2.83 Hz. Answer: 0.92, 2.83 Hz 2. The volume of bulb of a liquid filled thermometer is 1000 mm3. Its time constant and sensitivity are respectively 300 s and 3.6 mm/°C. If the volume of the bulb is reduced to 500 mm3, the sensitivity becomes ______________ a) 7.2 mm/°C b) 10.8 mm/°C c) 1.8 mm/°C d) 1.2 mm/°C if other conditions remain the same. Answer: 1.8 mm/°C 3. In force-current analogy stiffness constant K is analogous to __________ a) inductance b) reciprocal of inductance c) capacitance d) reciprocal of capacitance Answer: reciprocal of inductance 4. Dynamic response consists of __________ a) two parts, one steady state and the other tra

  Pole- Zero effect on process response Objective Questions and Answers 1. Pressure error can be measured by which of the following? a) Differential bellows and strain gauge b) Selsyn c) Strain gauge d) Strain gauge and potentiometer Answer: Differential bellows and strain gauge 2. Zeroes are defined as _______ a) Roots of the denominator of the closed loop transfer function b) Roots of the numerator of the closed loop transfer function c) Parts of the numerator d) Parts of the denominator Answer: Roots of the numerator of the closed loop transfer function 3. Addition of __________  increases the stability. a) zero b) one  c) number d) none of the mentioned Answer: zero 4. _____________ is not a final control element. a) Control valve b) Potentiometer c) Electro-pneumatic converter d) Servomotor Answer: Potentiometer 5. A control system is generally met with the time response specifications  _____________ a) Steady state accuracy b) Damping factor c) Setting time d) All of the mentione

  Approximation of higher order models  Objective Questions and Answers 1. The second derivative input signals modify which of the following? a) The time constant of the system b) Damping of the system c) The gain of the system d) The time constant and suppress the oscillations Answer: The time constant and suppress the oscillations 2. Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero? a) The system is relatively stable b) The system is highly stable c) The system is highly oscillatory d) The system is stable Answer: The system is highly oscillatory 3. Zero initial condition for a system means? a) Input reference signal is zero b) Zero stored energy c) Initial movement of moving parts d) System is at rest and no energy is stored in any of its components Answer: System is at rest and no energy is stored in any of its components 4. On which of the following factors does the sensitivity of a closed loop system to gain

  FPL Multiple Choice Questions 1. _________ is not the component of data structure. a) Operations b) Storage Structures c) Algorithms d) None of above Answer: None of above 2.  Which of the following is not the part of ADT description? a) Data b) Operations c) Both of the above d) None of the above Answer: None of above 3._________ Is a pile in which items are added at one end and removed from the other. a) Stack b) Queue c) List d) None of the above Answer: Queue 4.  Which of the following data structure can't store the non-homogeneous data elements? a) Arrays b) Records c) Pointers d) Stacks Answer: Arrays 5.  Which of the following is non-liner data structure? a) Stacks b) List c) Strings d) Trees Answer: Trees 6.  Which of the following data structure is linear type? a) Graph b) Trees c) Binary tree d) Stack Answer: Stack 7.  Which data structure allows deleting data elements from and inserting at rear? a) S

Control Systems MCQ 1. The transfer function technique is considered as inadequate under which of the following conditions ? a) Systems having complexities and non-linearities b) Systems having stability problems c) Systems having multiple input dis¬turbances (d) All of the above Answer: All of the above 2. With feed back ____________ reduces. a) system stability b) system gain c) system stability and gain d) none of the above Answer: system gain 3. Which of the following is the output of a thermocouple ? a) Alternating current b) Direct current c) A.C. voltage d) D.C. voltage Answer: D.C. voltage 4. Which of the following is exhibited by Root locus diagrams ? a) The poles of the transfer function for a set of parameter values b) The bandwidth of the system c) The response of a system to a step input d) The frequency response of a system Answer: The poles of the transfer function for a set of parameter values 5. If the gain of the critical damped system is increased it will behave as a

  Control Systems Questions & Answers 1. In case of type-1 system steady state acceleration is a) unity b) infinity c) zero d) 10 Answer: infinity 2. Which of the following devices is used for conversion of co-ordinates ? a) Microsyn b) Selsyn c) Synchro-resolver d) Synchro-transformer Answer: Synchro-resolver 3. Which of the following is the best method for determining the stability and transient response ? a) Root locus b) Bode plot c) Nyquist plot d) None of the above Answer: Root locus 4. An increase in gain, in most systems, leads to a) smaller damping ratio b) larger damping ratio c) constant damping ratio d) none of the above Answer: smaller damping ratio 5. A conditionally stable system exhibits poor stability at a) low frequencies b) reduced values of open loop gain c) increased values of open loop gain d) none of the above Answer: reduced values of open loop gain 6. Which of the following is the non-linearity caused by servomotor ? a) Static friction b) Backlash c) Satura

Control Systems Multiple Choice Questions & Answers  1. The viscous friction co-efficient, in force-voltage analogy, is analogous to a) charge b) resistance c) reciprocal of inductance d) reciprocal of conductance Answer: resistance 2. In a control system the output of the controller is given to a) final control element b) amplifier c) comparator d) sensor Answer: final control element 3. The capacitance, in force-current analogy, is analogous to a) momentum b) velocity c) displacement d) mass Answer: mass 4. The transient response of a system is mainly due to a) inertia forces b) internal forces c) stored energy d) friction Answer: stored energy 5. The second derivative input signals modify which of the following ? a) The time constant of the system b) Damping of the system c) The gain of the system d) The time constant and suppress the oscillations Answer: The time constant and suppress the oscillations 6. The on-off controller is a _____ system. a) digital b) linear c) non-linea

  Control Systems Objective Questions & Answers 1. As a result of introduction of negative feedback which of the following will not decrease ? a) Band width b) Overall gain c) Distortion d) Instability Answer: Band width 2. By which of the following the control action is determined when a man walks along a path ? a) Brain b) Hands c) Legs d) Eyes Answer: Eyes 3. _______ is an open loop control system. a) Ward Leonard control b) Field controlled D.C. motor c) Stroboscope d) Metadyne Answer: Field controlled D.C. motor 4. In an open loop control system a) Output is independent of control input b) Output is dependent on control input c) Only system parameters have effect on the control output d) None of the above Answer: Output is independent of control input 5. A.C. servomotor resembles a) two phase induction motor b) Three phase induction motor c) direct current series motor d) universal motor Answer: two phase induction motor 6. Any externally introduced signal affecting the contro

  Automotive Driverless train driving The automotive Automotive Driverless train driving system is one of the recent technologies used in train travel systems. Basically, this system means that the train will run without drivers. It is guided by LIDAR (Light Detection and Ranging) technology. It is a remote sensing method that uses light in the form of pulsed radar to measure ranges. It has various optical sensors and other types of laser-guided instruments which makes the vehicle to move automatically over a designated path. They run on a virtual or marked track and are monitored by a central control system like SCADA or DCS. Advanced levels of programming are done which ensures that the train follows its path without the need of a driver. This also automatically reduces the number of errors. This ensures that the safety and reliability of the system are maintained in a proper way. Just like an automated guided vehicle used in factories that run without drivers and on marked trains, a

  Dead time Multiple Choice Questions 1. Dead time of the instrument is a) The time required by an instrument for initial warming up b) The time required by an instrument to begin to respond to a change in the measured value c) The largest change of input quantity for which there is no output of the instrument d) None of the above Answer: The time required by an instrument to begin to respond to a change in the measured value 2. The dead time of an instrument refers to _____ a) Large change of input quantity for which there is no output. b) The time encountered when the instrument has to wait for some reactions to take place. c) The time before the instrument begins to response after the quantity has altered. d) Retardation or delay in the response of an instrument to a change in the input signal. Answer: The time before the instrument begins to response after the quantity has altered.

  Electric actuators Electric actuators are motor driven devices that utilize an electrical input signal to generate a motor shaft rotation. This rotation is, in turn, translated by the unit’s linkage into a linear motion,which drives the valve stem and plug assembly for flow modulation. In case of electric signal failure, these actuators can be specified to fail in the stem-out, stem-in, or last position. Commonly used motors for electric actuators include steppers and servos.  steppers A step motor uses gears with increments in the range of 5,000 to 10,000 at 90 degree rotation for accurate positioning at lower speeds. The disadvantage is that steppers may lose synchronization with the controller when employed in an open loop without an encoder or if they are undersized for an application.  servos Servos, by definition, are closed loop and provide superior performance at high speeds, but at a higher cost. High precision screws and anti-backlash mechanics provide accuracies to ten-tho

  Process Control Multiple Choice Questions 1. When we adjust integral time in a controller a) We determine an RC time constant in the controller’s internal feedback path b) We adjust the time it will take for integral to equal derivative c) We set the process time constant so that it will always equal 1 d) What happens specifically depends on the type of controller, pneumatic Answer: We determine an RC time constant in the controller’s internal feedback path 2. For proper feedback in a process control element, it is required to ________ a) measure P b) measure set point c) measure error d) measure comparator Answer: measure P 3. If in a proportional-plus-integral controller measurements away from the set point for a long period, the controller’s output will be a) 0 b) Unknown c) 0 d) 100 percent Answer: 0 4. In the modem controller, derivative action is applied only to the a) Error b) Measurement c) Setpoint d) Integral circuit Answer: Measurement 5. What is the main objective of proc