Murugappa Group interview questions and answers https://www.wikitechy.com/interview-questions/tag/murugappa-group-interview-questions-and-answers/ Interview Questions Thu, 09 Sep 2021 06:07:10 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png Murugappa Group interview questions and answers https://www.wikitechy.com/interview-questions/tag/murugappa-group-interview-questions-and-answers/ 32 32 Why we don’t use 2-20mA, 1-20mA, 3-20mA or 10-50mA signal instead of 4-20mA ? https://www.wikitechy.com/interview-questions/instrumentation/why-we-dont-use-2-20ma-1-20ma-3-20ma-or-10-50ma-signal-instead-of-4-20ma/ https://www.wikitechy.com/interview-questions/instrumentation/why-we-dont-use-2-20ma-1-20ma-3-20ma-or-10-50ma-signal-instead-of-4-20ma/#respond Thu, 05 Aug 2021 07:07:00 +0000 https://www.wikitechy.com/interview-questions/?p=1485

Why we don’t use 2-20mA, 1-20mA, 3-20mA or 10-50mA signal instead of 4-20mA ?

  • Generally, in a transistor some amount of voltage is required for turning it on.
  • This voltage is the cut in voltage. Up to this voltage it exists a nonlinearity in its characteristics. Beyond this cut in voltage the characteristics of transistor is linear.
  • This nonlinear region lays between 0-4mA, beyond 4ma it linear. That’s why 4-20 mA range is used.

Due to some following reasons 4-20mA signal is used,

  • 4-20mA has an inherent ‘live zero’. Zero engineering unit is 4mA not 0.0mA indicates an open circuit, fault in the line which is not valid.
  • 4-20 mA has little, if any, signal loss in its circuit; current regulation compensates for minor resistances in terminal boxes, whereas voltage drop across resistances for voltage signals creates an error.
  • S 4-20 mA signal is less susceptible to noise pickup than a voltage circuit. So it is free from interference from other signals.
  • 4-20 mA works at a relatively long distance(>1 Km ) boosting the power supply voltage will drive the signal further.
]]> https://www.wikitechy.com/interview-questions/instrumentation/why-we-dont-use-2-20ma-1-20ma-3-20ma-or-10-50ma-signal-instead-of-4-20ma/feed/ 0 How to calculate the flow rate in Vortex flow meter ? What is K factor ? Can you give me an example calculation to understand the same as better ? https://www.wikitechy.com/interview-questions/instrumentation/how-to-calculate-the-flow-rate-in-vortex-flow-meter-what-is-k-factor-can-you-give-me-an-example-calculation-to-understand-the-same-as-better/ https://www.wikitechy.com/interview-questions/instrumentation/how-to-calculate-the-flow-rate-in-vortex-flow-meter-what-is-k-factor-can-you-give-me-an-example-calculation-to-understand-the-same-as-better/#respond Thu, 05 Aug 2021 07:05:18 +0000 https://www.wikitechy.com/interview-questions/?p=1484

How to calculate the flow rate in Vortex flow meter ? What is K factor ? Can you give me an example calculation to understand the same as better ?

  • Vortex flow meters are flow sensors that detect the frequency of vortices shed by a bluff body placed in a flow stream.
  • The frequency of the vortices is proportional to the flow velocity.

Vortex flow Meter

Where:

  • fv is the frequency of vortex shedding.
  • D is the diameter of the pipe.
  • w is the width of bluff body over diameter of pipe.
  • K is the a constant for all fluids given design of meter. A k factor is introduced to compensate for the non-uniform profile of pipe flow.
  • S is the Strouhal number, determined experimentally.
  • Flow rate information can be output as an analog current signal.

What is K factor ?

  • K-factor is a dividing factor.
  • The term is usually encountered when dealing with pulse signals although analog K-factors are sometimes used.
]]> https://www.wikitechy.com/interview-questions/instrumentation/how-to-calculate-the-flow-rate-in-vortex-flow-meter-what-is-k-factor-can-you-give-me-an-example-calculation-to-understand-the-same-as-better/feed/ 0 Wind is a Horizontal Movement of air https://www.wikitechy.com/interview-questions/geography/wind-is-a-horizontal-movement-of-air/ https://www.wikitechy.com/interview-questions/geography/wind-is-a-horizontal-movement-of-air/#respond Mon, 19 Jul 2021 11:14:07 +0000 https://www.wikitechy.com/interview-questions/?p=1051

1. Wind is

  1. Horizontal movement of air
  2. Vertical movement of air
  3. Movement of air

Answer : A. Horizontal movement of air

  • Wind is horizontal movement of air from an area of HIGH pressure to an area of LOW pressure.
  • There are two types of winds:
    • local winds
    • global winds
  • Both local and global winds are caused by differences in air pressure due to incapable heating of the Earth’s surface and air above it.
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