Answer / mohamed yousuf(instrumentation

radar type level transmitter works on the principle
of "time of flight system " actually this type of
transmitter having antenna used to send and recive the
micro waves these waves having the frequency range in GHZ.
by calculating the time required to send and recieve the
data the distance can be calculated from the following
expression
velocity=2 distance/time
therefore distance =velocity *time /2

for zero level 4ma and for span 20ma has to set

Answer / vikram kumbhekar

first of all we calculated the total lenth, then set 4mA at
zero level & max lenth at 20mA. When we send a RF freq
signal the time required to recieved the signal,that time
will be calculated by following formula

distance=velocity*time/2

in this way we get the value

Answer / vsraj_ece

radar level txr as a geiger counter and the source is emits
the radio waves into the vessel it contains some liquids the
ionised radio electrons move to the chargable ends as a
measurement unit if low liquids are in vessel means higher
electrons move to measurement unit.

Answer / jamal qamar

Radar level measurement is based on the principle of
measuring the time required for the microwave pulse and its
reflected echo to make a complete return trip between the
non-contacting transducer and the sensed material level.
Then, the transceiver converts this signal electrically into
distance/level and presents it as an analogue and/or digital
signal. The transducer’s output can be selected by the user
to be directly or inversely proportional to the span. RADAR
LEVEL MEASUREMENT BASICS

I want to know the questions asked in ONGC interview(after being selected in the written exam) for Instrumentation branch.Kindly help.

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given a processor batch of 1000 resistors moving on the conveyor belting in a large factory. the resistors is value at 10k ohms each but when the resistors reach the quality control, some of the resistor has been rejected caused by failure in manufacturing.the high quality measurement is used to determine the failure. describe the instrumentation terminology in measurement of a system above with explaining the important in:- -reliability -sensitivity -repeatability -precision -range -resolution -linearity -hysteresis -error -accuracy (answer must related to the scenario above)

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why micro controller 8051/52's clock frequency is internally divide by 12 ?? and why it is further divide by 32 in UART serial communication ??

1 Answers  

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How we connect a instrument with ground, Give brief explanation with help of diagram?

0 Answers  

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Why do we need to install hook-up line differential pressure type level transmitter when the differential pressure type level transmitter with capillary are available?

2 Answers  

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What is the difference between EPROM & EEPROM.

1 Answers   Sabic,

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what is difference between positioner and position transmitter in control valve

2 Answers  

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what is IEC code in cables & how to selecting cables?

0 Answers   ROS,

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installation process of orifice,a question asked for confusion creation in interview by BARC 1.if orifice is tightly fitted with pipe ,it will act like venturi 2.if orifice is left hanging in between liquid it will not create the pressure difference exactly,

0 Answers   BARC,

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Explain what is meant by the term “FLASH POINT” of liquid?

2 Answers  

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what is use of communication wire in multipare cable(oil and gas field), why this communication wire not used in single pair cable?

0 Answers  

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how is a displacer type level transmitter calibrated.explain the method?

2 Answers   Emirates,

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