#Instrumentation interview questions series

Accuracy: it is the degree of closeness with which an instrumentation reading approaches to the true value of the quantity being measured. 36.What is the difference between accuracy & precision? Ans. It facilitates this process of comparison. It is an act of comparison between the unknown quantity and the standard resulting in knowing the magnitude of the unknown quantity in terms of the standard being used for the purpose of comparison. 33.Electromagnetic flow meter is not suitable for which kind of fluids? Ans. 32.Stroboscope is used for the measurement of_? Ans. It gives a permanent pressure loss but due to their low cost they are preferred in the industries. 30.What is the disadvantage of orifice meter & why they are preferred in the industries? Ans. RTDs are typically connected with other fixed resistors In a pi configuration In a bridge configuration And variable resistors And capacitors in a filter-type circuit 15.Holding current for an SCR is best described as The minimum current required for turn-off The current required before an SCR will turn on The amount of current required to maintain conduction The gate current required maintaining conduction 16.What is the moving part of a linear variable differential transformer? Primary Secondary Diaphragm Core 17.What does a Hall Effect sensor sense? Temperature Moisture Magnetic fields Pressure 18.What causes the piezoelectric effect? Heat or dissimilar metals Pressure on a crystal Water running on iron A magnetic field 19.What type of application would use a photo voltaic cell? An automobile horn A TI 92 calculator A magnetic field detector A remote power source 20.A transducerвЂ™s function is to: Transmit electrical energy Convert energy Produce mechanical energy Prevent current flow 21.Derived units are obtained from various combinations of Electrical quantities Fundamental units Metric prefixes International standards 22.Scientific notation is a method of expressing a very large number of expressing a very small number used to make calculations with large and small numbers All of the above 23.If you drop a 5 when rounding a number, you are using the round-to-even rule significant digit rule round-off rule retained digit rule 24.A measure of the repeatability of a measurement of some quantity is error precision accuracy significant 25.Another name for вЂњfundamental unitsвЂќ is base units atoms the metric system letter symbols 26.When using the terms вЂњaccuracyвЂќ and вЂњprecisionвЂќ for measurements вЂњprecisionвЂќ implies less measurement error than вЂњaccuracyвЂќ вЂњaccuracyвЂќ implies less measurement error than вЂњprecisionвЂќ вЂњprecisionвЂќ measures the repeatability of a measurement both terms mean the same thing 27.For what purpose Pirani gauge is used? Ans. None of the above 8.The connections to a thermocouple Can produce an unwanted thermocouple effect, which must be compensated for Produce an extra desirable thermocouple effect Must be protected, since high voltages are present Produce an extra desirable thermocouple effect and must be protected, since high voltages are present 9.What is the zero-voltage switch used for? To reduce radiation of high frequencies during turn-on of a high current to a load To control low-voltage circuits To provide power to a circuit when power is lost For extremely low-voltage applications 10.Temperature sensing can be achieved by the use of Thermocouples RTDs thermistors All of the above 11.The purpose of compensation for a thermocouple is to decrease temperature sensitivity to increase voltage output to cancel unwanted voltage output of a thermocouple used for high-temperature circuits 12.The change in value of an analog signal during the conversion process produces what is called the Quantization error Resolution error Nyquist error Sampling error 13.Which of the following performance specifications applies to a sample-and-hold circuit? Aperture time Aperture droop Feedback Acquisition jitter 14. is based on the gauge factor, but is typically less than an ohm has a positive temperature coefficient 7.The output voltage of a typical thermocouple is Less than 100 mV Greater than 1 V Thermocouples vary resistance, not voltage.

#Instrumentation interview questions series

Grams pounds ounces kilograms 2.Which of the following would be about the height of the average doorway? 2 meters 2 centimeters 2 millimeters 2 kilometers 3.A series dissipative regulator is an example of a: linear regulator switching regulator shunt regulator dc-to-dc converter 4.Which of the following is a unit of mass in the metric system? gram milliliter centimeter pounds 5.What device is similar to an RTD but has a negative temperature coefficient? Strain gauge Thermistor Negative-type RTD Thermocouple 6.The resistive change of a strain gauge is based on the weight placed upon it, but can be many thousands of ohms is usually no more than 100 omega. RED marked are the correct answers 1.A balance beam scale uses which of the following units?.