Process Control and Instrumentation Thermal wells used in temperature measurements should have Polished surface High transmissivity of radiation Very thick walls Low emissivity Polished surface High transmissivity of radiation Very thick walls Low emissivity ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation A simple pitot tube measures the Maximum velocity Point velocity Static pressure Average velocity Maximum velocity Point velocity Static pressure Average velocity ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation The operation of a rotameter is based on Pressure drop across a nozzle Rotation of a turbine Pressure at a stagnation point Variable flow area Pressure drop across a nozzle Rotation of a turbine Pressure at a stagnation point Variable flow area ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Measurement of sub-zero Celcius temperature in industry is done most commonly by Bi-metallic thermometers Gas thermometers Resistance thermometers Thermocouples Bi-metallic thermometers Gas thermometers Resistance thermometers Thermocouples ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature Embrittlement of iron occurs Rusting of iron takes place Both B and C Here Emf produced is very low of the order of microvolt Embrittlement of iron occurs Rusting of iron takes place Both B and C Here Emf produced is very low of the order of microvolt ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their Low electrical conductivity High viscosity index Low thermal conductivity Low flash point Low electrical conductivity High viscosity index Low thermal conductivity Low flash point ANSWER DOWNLOAD EXAMIANS APP
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