What should be the resolution of a digital voltmeter having three digit 0-3V?

What should be the resolution of a digital voltmeter having three digit 0-3V?
by

1 Answer

Answer :

3mV
by

Related questions

How much current does an electrostatic voltmeter require through it to operate?

Description : How much current does an electrostatic voltmeter require through it to operate?

Last Answer : zero current

Calculate the series resistance needed to convert a D' Arsonval meter with FSD of 100uA and a meter resistance of 1kohm to a voltmeter with 10V FSD.

Description : Calculate the series resistance needed to convert a D' Arsonval meter with FSD of 100uA and a meter resistance of 1kohm to a voltmeter with 10V FSD.

Last Answer : Rs=10V/100uA - 1kohm = 99kohm

Error in voltmeter is due to ___

Description : Error in voltmeter is due to ___

Last Answer : loading

An electrostatic voltmeter in which an assembly of figure-8-shaped metal plates rotates between the plates of a stationary assembly when a voltage is applied betweeen the assemblies.

Description : An electrostatic voltmeter in which an assembly of figure-8-shaped metal plates rotates between the plates of a stationary assembly when a voltage is applied betweeen the assemblies.

Last Answer : Kelvin voltmeter

High sensitive DC voltmeter provides accurate reading when measuring ___ circuits.

Description : High sensitive DC voltmeter provides accurate reading when measuring ___ circuits.

Last Answer : high resistance

High sensitive DC voltmeter provides accurate reading when measuring ___ circuits.

Description : High sensitive DC voltmeter provides accurate reading when measuring ___ circuits.

Last Answer : high resistance

Voltage measurement in a high impedance circuit requires a voltmeter with

Description : Voltage measurement in a high impedance circuit requires a voltmeter with

Last Answer : high input impedance

A Kelvin electrostatic voltmeter uses what method of damping?

Description : A Kelvin electrostatic voltmeter uses what method of damping?

Last Answer : fluid friction

Which of the voltmeter is used for measuring high direct voltage (say 10kV)?

Description : Which of the voltmeter is used for measuring high direct voltage (say 10kV)?

Last Answer : electrostatic

In order to make an accurate measurement as possible, the internal resistance of a voltmeter must be

Description : In order to make an accurate measurement as possible, the internal resistance of a voltmeter must be

Last Answer : as high as possible

What is the typical full-scale voltage across a moving coil voltmeter?

Description : What is the typical full-scale voltage across a moving coil voltmeter?

Last Answer : 50mV

A type of meter that gives a precise reading of voltage, current or resistance where there is the generation of samples at the input and then feeds it to a digital read-out.

Description : A type of meter that gives a precise reading of voltage, current or resistance where there is the generation of samples at the input and then feeds it to a digital read-out.

Last Answer : DMM

An instrument of device having recognized permanent of stable value that is used as a reference.

Description : An instrument of device having recognized permanent of stable value that is used as a reference.

Last Answer : standard instrument/device

What do you call an oscilloscope that uses sampling techniques in processing signals having frequencies beyond its normal capabilities?

Description : What do you call an oscilloscope that uses sampling techniques in processing signals having frequencies beyond its normal capabilities?

Last Answer : sampling oscilloscope

What is two wire and three wire R.T.D. system ?

Description : What is two wire and three wire R.T.D. system ?  

Last Answer : Two wire R .T .D. system : Two wire RTD system use for short distance like a compressor field local panel. Three wire System : Three wire system use for long distance coke a field to control Run. The third wire is used for compensation of lead wire resistance. 

What does a transmitter output start from 3-15 psi or (0.2 - 1 Kg/Cm2) or 4 - 20 ma. etc. ?

Description : What does a transmitter output start from 3-15 psi or (0.2 - 1 Kg/Cm2) or 4 - 20 ma. etc. ? 

Last Answer : The transmitter output stance from what is known as "live zero". This system has specific advantages : 1. The systems automatically alarms when the signal system becomes inoperative. ... transmitter operating, but transmitting a zero measurement and a failure, in the signal system. 

You are given a mercury manometer range 0 -760 mm ? A vacuum gauge reads 60 mm vacuum. The test manometer reads 50 vacuum ? Which of the two in correct.

Description : You are given a mercury manometer range 0 -760 mm ? A vacuum gauge reads 60 mm vacuum. The test manometer reads 50 vacuum ? Which of the two in correct.

Last Answer : The transmitter is correct because 760 - 50 = 710 mm abs.

How will you calibrate an absolute pressure transmitter using vacuum manometer. Range 0-400mm abs ?

Description : How will you calibrate an absolute pressure transmitter using vacuum manometer. Range 0-400mm abs ?

Last Answer : The procedure for calibration is as follows : Connect air supply to the transmitter. Connect a test gauge of 0-1.4 Kg/cm2 to the output. Connect Vacuum pump with tee off to the manometer. Apply 760 ... nearest ) and adjust zero. Apply 360 mm Vacuum adjust span. ( 760 - 360 = 400 mm abs. )

A sensing element that provides a dc voltage less than 10mV with typical power range of 0.1 to 100mW

Description : A sensing element that provides a dc voltage less than 10mV with typical power range of 0.1 to 100mW

Last Answer : thermal converters

On a simple ohmmeter, the 0 ohm(s0 mark is located __ of the scale

Description : On a simple ohmmeter, the 0 ohm(s0 mark is located __ of the scale

Last Answer : at far right

A galvanometer with 20 ohms coil resistence has a full-scale deflection of 10 mA. A 0.02 ohm is placed across the meter to increase its rating capacity. What is the new full scale current for the meter?

Description : A galvanometer with 20 ohms coil resistence has a full-scale deflection of 10 mA. A 0.02 ohm is placed across the meter to increase its rating capacity. What is the new full scale current for the meter?

Last Answer : False.

An ammeter has a full-scale deflection current of 100mA. If the same ammeter is used to measure a full-scale current of 1.0ampere, what is the value of the shunt resistor in ohms if the voltage across the meter is 9.0 volts?

Description : An ammeter has a full-scale deflection current of 100mA. If the same ammeter is used to measure a full-scale current of 1.0ampere, what is the value of the shunt resistor in ohms if the voltage across the meter is 9.0 volts?

Last Answer : 10 ohms

A circuit consists of three bateries of emf `E_(1) = 1V, E_(2)=2V` and `E_(3)=3V` and internal resistance `1Omega, 2Omega` and `1Omega` respectively w

Description : A circuit consists of three bateries of emf `E_(1) = 1V, E_(2)=2V` and `E_(3)=3V` and internal resistance `1Omega, 2Omega` and `1Omega` respectively w

Last Answer : A circuit consists of three bateries of emf `E_(1) = 1V, E_(2)=2V` and `E_(3)=3V` and internal resistance `1Omega, ... ` B. `2.0V` C. `2.2V` D. `3.0V`

What is a filter used for ?

Description : What is a filter used for ?

Last Answer : The half wave and full wave signals are pulsating D . C . voltages. The use of such voltages is limited to charging batteries, running D. C. motors, and a few other applications. What we really ... voltage from a battery. To get a constant voltage from this, we can use a capacitor input filter. 

What is Zener Diode ? What is a voltage Regulator ?

Description : What is Zener Diode ? What is a voltage Regulator ?

Last Answer : The breakdown region of a p n diode can be made very sharp and almost vertical Diodes with almost vertical breakdown region are known as Zever Diodes. A Zener diodes operating in the breakdown ... VOLTAGE REGULATOR : The output remains constant despite changes in input voltage due to Zever effect.  

What is transistor ? What are the different types ?

Description : What is transistor ? What are the different types ?

Last Answer : A transistor is a three lagged semi conductor device. Basically a transistor means (transfer - resister). Whether the transistor is pnp or npn it resembles two diodes (back to back). The one of the left ... transistor : Emitter - Base - Forward Bias. Collector - Base - Reverse Bias. 

What is CB, CE and CC configuration ?

Description : What is CB, CE and CC configuration ?

Last Answer : Buffer : A device or a circuit used to isolate two pt'ne circuits or stages. The emitter follows is a example of buffer. Alpha = IC / IE Beta = IC / IB

How will you test a transistor with a multimeter. ?

Description : How will you test a transistor with a multimeter. ?

Last Answer : 1. Emitter +ve of meter and Base -ve output = Low resistance 2. Emitter -ve of meter and base +ve output = High resistance. 3. Collector +ve and Base -ve output = Low. 4. Collector -ve and base +ve output = High. Emitter : Collector = High Resistance. PNP : Opposite Results. 

What is a thyristor ? What are its uses ?

Description : What is a thyristor ? What are its uses ?

Last Answer : A thyristor is a special kind of semi conductor device that uses internal feedback to produce latching action. Use : Used for controlling large amounts of load power in motors, heaters, lighting systems etc ... the latches like a open switch. This latch will always stay in open or close position.  

What are Intrinsically safe system ?

Description : What are Intrinsically safe system ?

Last Answer : Intrinsic safety is a technique for designing electrical equipment for safe use in locations made hazardous by the presence of flammable gas or vapors in air. "Defn. :" Intrinsically safe circuit is ... , unfortunately, been adopted in all countries. However two sets of codes in common use are.  

What is feed back control ? What is feed forward control ? Discuss its application ?

Description : What is feed back control ? What is feed forward control ? Discuss its application ?

Last Answer : Feed back control: Feed back control involves the detection of the controlled variable and counteracting of charges its it's value relative to set point, by adjustment of a manipulated ... controller for a particular process application, two factors time and gain must be considered.    

What is Furnace Draft control ?

Description : What is Furnace Draft control ? 

Last Answer : Balanced draft boilers are generally used negative furnace pressure. When both forced draft and induced draft are used together, at some point in the system the pressure will be the same as that of atmosphere. ... have is a very slight (about 0.1" H20 ) negative pressure of the top of furnace.  

What is the difference the a wheatstone bridge and a potentiometer ?

Description : What is the difference the a wheatstone bridge and a potentiometer ?

Last Answer : The difference between a potentiometer and a wheatstone bridge measuring instrument is that potentiometer is a voltage measuring instrument and wheatstone bridge is a current measuring instrument. 

What is the specialty of thermocouples lead wires ?

Description : What is the specialty of thermocouples lead wires ?

Last Answer : They should be of the same material as the thermocouple.  

What are skin temperature thermocouples ?

Description : What are skin temperature thermocouples ? 

Last Answer : Skin thermocouples are those which are directly connected to the process without any thermowell. Used for measuring the skin temperature of heaters furnaces, flue gas etc.  

What type of sensing element would you use to measure very low temperature ?

Description : What type of sensing element would you use to measure very low temperature ?

Last Answer : The sensing element used for measuring very low temperature is R. T. D. ( Resistance Temperature Detector )

How will you calibrate a temp. recorder using a potentiometer ?

Description : How will you calibrate a temp. recorder using a potentiometer ?

Last Answer : Connect the potentiometer output to the input of temp. recorder. 1. Connect the ( +ve ) to the ( +ve ) and ( -ve ) to the ( -ve ). 2. If ambient compensation is provided ... ambient temp. millvolts to the corr. input millvolts measured. Find out from the chart for the corresponding temperature. 

Why are Thermowells used ?

Description : Why are Thermowells used ?

Last Answer : In numerous application it is neither desirable nor practical to expose a temperature sensor directly to a process material. Wells are therefore used to protect against damage corrosion, erosion, abrasion and high pressure processes. A ... 3. Monel. 4. Alloy steal. 5. Hastelloy 'C'.

Why is a converter used in a temp. recorder ?

Description : Why is a converter used in a temp. recorder ? 

Last Answer : The converter is designed to convert D. C. input voltage into an A. C. input voltage proportional in amplitude to the input.  

What is burnout feature ? Explain.

Description : What is burnout feature ? Explain.

Last Answer : Burnout provides the warning feature of driving indicator the end of scale if the input circuit should open. A burnout resistor is provided which develops a voltage drop between the measuring circuit and the ... Upscale burnout : R value 10 M Downscale burnout : R value 2.2 M 

What is the constant voltage unit ?

Description : What is the constant voltage unit ?

Last Answer : The constant voltage circuit consists of a rectifier, CR, a filter capacitor C1, followed by two stages of zener regulation. Abridge configuration is provided to 1amp line voltage regulation ... , Thus variations. Resisters R2 and R3 form a bridge that any remoment line voltage effects. 

Draw a potentiometer temp. Measuring circuits and explain its?

Description : Draw a potentiometer temp. Measuring circuits and explain its?  

Last Answer : OPERATION : The input to the instrument is a measurement of some in the processes using a sensing element ( such as thermocouple ) or a device to produce direct voltage, which is the voltage (signal) ... to zero results ( null point ) the balancing ( servo motor is be longer driven )   

What is Pt 100 mean. ?

Description : What is Pt 100 mean. ? 

Last Answer : Pt100 means 100 OHMS at 0'C for a platinum resistance bulb.  

Explain the working of an Enraf level gauge?

Description : Explain the working of an Enraf level gauge?

Last Answer : The Enraf precise level gauge are based on servo powered null-balance technique. A displacer serves as a continuous level sensing element. Principle: A displacer with a relative density higher than ... to a remote indicator of which the receiver motor drives a counter indicating level variation.  

How will you check zero of a level D.P. transmitter while is line ?

Description : How will you check zero of a level D.P. transmitter while is line ? 

Last Answer : ١. Close both the isolation valves. ٢. Open the vent valve on L.P. leg and H.P. leg drain. ٣. Check and adjust zero if necessary. 

How will you commission D.P. transmitter in field in pressurized vessel.

Description : How will you commission D.P. transmitter in field in pressurized vessel.

Last Answer : ١. Close both the isolation valves, Vent the H.P. side. ٢. Fill it with the sealing liquid. ٣. Open the L.P. side vent valve. ٤. Adjust zero with suppression spring. ٥. Close the L.P. side vent valve. ٦. Open both the isolation valves.  

What are the limitations of leveltrol ?

Description : What are the limitations of leveltrol ?

Last Answer : The limitations of a level control that it cannot be used for lengths more than 72 inches.  

What is the used of Suppression and elevation ?

Description : What is the used of Suppression and elevation ?  

Last Answer : Suppression and elevation are used on Level applications where (1) transmitters are not mounted on some level (2) Wet leg. i.e. condensable vapors are present.

What will happen if the displacer has a hole in it while in line ?

Description : What will happen if the displacer has a hole in it while in line ?  

Last Answer : The output will be minimum. 

What will happen if the displacer has fallen down while in line ?

Description : What will happen if the displacer has fallen down while in line ?

Last Answer : The output will be maximum.