Type j thermocouple iron constantan.
Dry bulb thermometer read more than wet bulb.
Scale of target flow meter: flow is proportional to the square of the flow rate.
From root locus or bode plot asking whether it is lead or lag.
Bode plot given and asking stability.
Specific gravity is a dimensionless.
In rota meter at equilibrium drag force + buoyancy force = force due to gravity
A McLeod gauge measure very low pressures.
What is gauge factor?
How many nand gate to make and gate.
Conversion time of 10 bit successive approximation if clock period is given.
Ques on clipper clamper circuit.
Resistance of PT100 at 100 Celsius is 138.50 ohm.
Segmental orifice plates are used to measure the flow of light slurry's.
Schmitt trigger followed by an integrator: triangular wave generator.
Question on basic electrical, control system, digital electronics and Instrumenation.
Sunday, April 24, 2011
Sunday, May 30, 2010
Required knowledge for barc 2010 instrumentation paper
Specific conductivity(S/cm) = measured conductivity (s)* electrode cell constant (1/cm)
Siemens (S), also called the mho (1/ohm).
electrode cell constant = (length of the column of liquid between the electrode) / (A is the area of the electrodes)
salt concentration control by measuring conductance of water. more the amount of water higher the conductivity.
Type T copper–constantan thermocouple
Type E Chromel-Constantan thermocouple has the highest sensitivity.
At 100 percent relative humidity, wet bulb temperature is maximum and equal to dry bulb temperature. As there is no cooling due to evaporation. Lower the humidity lower the temperature of wet bulb then dry bulb.
Temperature difference between the dry bulb and wet bulb, depends on the humidity of the air.
Latent Heat of fusion 79.72 (cal/g) or 333.55(kJ/kg)
The specific heat of water is 4.186 kJ/kg °k
Q=M*C*(change in temperature).
The rotameter’s scale is linear.
In silicon diodes up to about 5.6 volts, the Zener effect is the predominant effect and shows a marked negative temperature coefficient. Above 5.6 volts, the avalanche effect becomes predominant and exhibits a positive temperature coefficient. In a 5.6 V diode, the two effects occur together and their temperature coefficients neatly cancel each other out, thus the 5.6 V diode is the component of choice in temperature-critical applications.
Control valve size is either equal to or slightly less then the pipe size.
target flow meter used to measure bi-directional flow, signal polarity indicates direction of flow.
Siemens (S), also called the mho (1/ohm).
electrode cell constant = (length of the column of liquid between the electrode) / (A is the area of the electrodes)
salt concentration control by measuring conductance of water. more the amount of water higher the conductivity.
Type T copper–constantan thermocouple
Type E Chromel-Constantan thermocouple has the highest sensitivity.
At 100 percent relative humidity, wet bulb temperature is maximum and equal to dry bulb temperature. As there is no cooling due to evaporation. Lower the humidity lower the temperature of wet bulb then dry bulb.
Temperature difference between the dry bulb and wet bulb, depends on the humidity of the air.
Latent Heat of fusion 79.72 (cal/g) or 333.55(kJ/kg)
The specific heat of water is 4.186 kJ/kg °k
Q=M*C*(change in temperature).
The rotameter’s scale is linear.
In silicon diodes up to about 5.6 volts, the Zener effect is the predominant effect and shows a marked negative temperature coefficient. Above 5.6 volts, the avalanche effect becomes predominant and exhibits a positive temperature coefficient. In a 5.6 V diode, the two effects occur together and their temperature coefficients neatly cancel each other out, thus the 5.6 V diode is the component of choice in temperature-critical applications.
Control valve size is either equal to or slightly less then the pipe size.
target flow meter used to measure bi-directional flow, signal polarity indicates direction of flow.
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