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P

Priya 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is the difference between Resistance and capacitance?

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Anupama Patil replied | 30/09/2016

Resistence is property of any material that opposes the flow ofelectric current.
Capacitance is the ability to store the electric charge in it without flowing.This builds electric potential.

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Ramalingam replied | 11/10/2016

in a resistance energy gets dissipated, whereas in a capacitance energy is stored. resistance is a resistive device, whereas a capacitance is a reactive device. in a resistance the voltage and current are in phase, whereas in a capacitor, current and voltage are in quadrature.

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Lamaan 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is the use of Thermocouple?

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Ramalingam replied | 11/10/2016

a passive transducer used for measurement of temperature

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Shantanu replied | 23/11/2016

A Thermocouple is a sensor used to measure temperature. Thermocouple consist of two wire legs made from different metals. The wires legs are welded together at one end, creating a junction. This junction is where the temperature is measured. When the junction experiences a change in temperature, a voltage is created.

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Gagandeep 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What do you mean LTI system?
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Manish Pandey replied | 29/09/2016

LTI system means Linear time Invariant system , so as the name LTI a system which follows the characteristics of linearity and time invariant property is LTI system.

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Anupama Patil replied | 30/09/2016

It is a system which obeys superposition principle.It ia a linear system.It does not change with time,be it past,present or future.Hence we can predict its behaviour.We can define system always.

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Vikas 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is the value of n terms of the series 4+44+444+......... ?

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Prathyusha replied | 28/09/2016

4/9(9+99+999+... n terms)
4/9(10-1+100-1+1000-1+...n terms)
4/9(10+100+1000+... n terms - n)
4/9((10^n-10)/9 -n)

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Anupama Patil replied | 30/09/2016

= 4 ( 1 + 11 + 444 + ...)
= 4/9( 9 + 99 + 999 +..)
= 4/9 (10 - 1 + 100 - 1 + 1000 -1 ......) say n terms
= 4/9( 10+ 100+1000 ..... +10^n - n)
= 4/9{ ((10^n - 10)/9) -n}

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Puneethkumar 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is the magnitude of the Fourier transform of y(t) where the signal x(t) have the Fourier transform X(?) ; y(t) = d/dt[x(t - td)], where td is an arbitrary delay ?
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Navneet replied | 20/10/2016

2*pi*|f*X(f)|

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Amandeep 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What do you mean by linear variable differential transformer (LVDT)?
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Vikas replied | 28/10/2016

This transformer is used for measuring linear displacement , position

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Yash 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is the variance of a random variable that is uniformly distributed over the interval 2 to 10?
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Guduri Ganesh Sai replied | 29/09/2016

8

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Anupama Patil replied | 30/09/2016

variance of uniform distribution from limits a to b is given by ( (b-a)^2 /12)

Here a = 2 b= 10 therfore varieance or square of std dev is 8^2 / 10 64/10m= 6.4

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A

Ajit 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

The torque in a rotating shaft is measured using strain gauges. What will be the arrangement of the strain gauge so that the strain gauges must be positioned on the shaft ?
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S Venkateswarlu replied | 06/10/2016

45 degree each

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Nagasanthoshi 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What will be the bandwidth of g2(t), if the bandwidth of a low-pass signal g(t) is 3 kHz ?
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Guduri Ganesh Sai replied | 29/09/2016

1.5klhz

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Anupama Patil replied | 30/09/2016

6 Khz

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R

Renu 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is the quantization error of ADC?
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S Venkateswarlu replied | 06/10/2016

Quantization error and (assuming the ADC is intended to be linear) non-linearity are intrinsic to any analog-to-digital conversion

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Ramalingam replied | 11/10/2016

Quantization error is due to the rounding off in an ADC. It is equal to +/- 1/2 LSB

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Krishnaraj 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is inverse proportional of Resistance?

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Prathyusha replied | 28/09/2016

1/resistance = conductance denoted by G

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Ramalingam replied | 11/10/2016

conductance

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A

Anurag 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

Define calorimeter?

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Rashmi replied | 30/09/2016

an apparatus for measuring the amount of heat involved in a chemical reaction

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Shantanu replied | 23/11/2016

An apparatus for measuring the amount of heat involved in a chemical reaction or other process.

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K

Kalpana 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

Define network communication?

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S Venkateswarlu replied | 06/10/2016

Defined by their size and complexity, they come in four main types: (1) small networks, used for the connection of subassemblies and usually contained in a single piece of equipment; (2) Local Area Networks, or LAN, cables or fibers used to connect computer equipment and other terminals distributed in a localized area, ...

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My 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

Define Newton - Ralphson’s method?

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Dr Ashok replied | 11/10/2016

It is a method for finding successively better approximations to the roots (or zeroes) of a real-valued function.

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Giridhari B Chandrabansi replied | 11/10/2016

Its a method to find root of non linear equation.

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P

Pavan 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is scalar and vector quantity?

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Prathyusha replied | 28/09/2016

any quantity that has only magnitude to define it completely is caled scalar quantity, Eg: weight
any quantity that requires magnitude and direction to define it completely is called vector quantity Eg: displacement(20m north)

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Ramalingam replied | 11/10/2016

scalar has only magnitude. vector has both magnitude and direction.

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Saravanan 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is the use of spectrometer?

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Guduri Ganesh Sai replied | 29/09/2016

used to identify the frequencies in the given signal

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Vishal 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

Define Spectrometer?

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Rashmi replied | 30/09/2016

an apparatus used for recording and measuring spectra, especially as a method of analysis.

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S

Sumit 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is the use of ECG?

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Priyanka replied | 28/09/2016

measuring instrunment for heart processing system

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J

Jaleeluddin 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What do you mean by ECG?

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Guduri Ganesh Sai replied | 29/09/2016

electrocardiogram.it study the function of heart based on the signal its generates in the form of waves.

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Anupama Patil replied | 30/09/2016

Electro caridio gram.Used to measure the heart related signals like heart beat,rythm and amplitude converted into electrical signals and shown as graph

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A

Aman 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

A loop transfer function is given by:G(s)H(s) = K(s + 2)/s power 2(s + 10). What is the point of intersection of the asymptote of G(s)H(s) on the real axis in the s-plane?

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Gangadhar replied | 29/09/2016

(Sum of poles - sum of zeros)/(P-Z)
ie (-10-10-(-2))/(3-1)=-9
ie (-9,0)

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K

Kiran 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

Why semiconductor strain gauges typically have much higher gauge factors than those of metallic strain gauge?

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Pradeep Verma replied | 11/10/2016

Gauge factor = (delta R/ R)/ Strain,
Basic principle of operation of operation of semiconductor strain gauge is the piezoresistive effect . This effect is the basic cause of high changes of resistance on strained. so its gauge factor is high.
Other hand in mettalic strain gauge, the cause of change of resistance when strained, is only change in shape of metal so its more...  more»
Gauge factor = (delta R/ R)/ Strain,
Basic principle of operation of operation of semiconductor strain gauge is the piezoresistive effect . This effect is the basic cause of high changes of resistance on strained. so its gauge factor is high.
Other hand in mettalic strain gauge, the cause of change of resistance when strained, is only change in shape of metal so its more low compare than semiconductor.
If you want to know more about piezoresistive effect or any confusion, tell me .
Thank You. «less

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Pradeep Verma replied | 12/10/2016

Due to piezoresistive effect.

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Nitesh 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is the real power in watts delivered to a load impedance ZL = (i,j2)? by an ideal current source i(t) = 4 sin(?l - 20)A ?

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Guduri Ganesh Sai replied | 29/09/2016

v(rms)*i(rms) cos theta

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H

Hima 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What is the probability density function e power (x/2)/K if the value of the K is constant?

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Manish Pandey replied | 29/09/2016

as pdf =f(x)= d/dx (F(x))
so here f(x)= d/dx (e power (x/2)/k )
= 1/2K exp(x/2k)

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Dhanshri 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

What will be the x-y plot if the equation is: x(t) - 3 sin(1000 ?t) and y(t) - 5 cos(1000 ?t + ?/4) ?

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Chandan replied | 19/10/2016

what is in the place of '?'

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A

Ankit 28/09/2016 in  GATE Coaching classes, Instrumentation(GATE Coaching classes)

The population of a new city is 5 million and is growing at 20% annually. How many years would it take to double at this growth rate?

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Guduri Ganesh Sai replied | 29/09/2016

approaximately 4 years i think, to get exact value use calci

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