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The adjustment of position of shading bands, in an energy meter is done to provide friction compensation.

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Description :

An induction type energy meter is found to run fast. Correction for this error can be made by  (A) Over-load compensation. (B) Voltage compensation. (C) Moving the brake magnet away from the centre of the disc. (D) Moving the brake magnet towards the centre of the disc.

Answer :

An induction type energy meter is found to run fast. Correction for this error can be made by Moving the brake magnet away from the centre of the disc.

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112 views 1 answer
Description :

A 200 V, 5 A d.c. energy meter is tested at its marked ratings. The resistance of the pressure circuit is 8000 Ω and that of current coil is 0.1 Ω. The power consumed when testing the meter with phantom loading with current circuit excited by a 6 V battery is (A) 2.5 W (B) 5 W (C) 32.5 W (D) 35 W

Answer :

A 200 V, 5 A d.c. energy meter is tested at its marked ratings. The resistance of the pressure circuit is 8000 Ω and that of current coil is 0.1 Ω. The power consumed when testing the meter with phantom loading with current circuit excited by a 6 V battery is 35 W

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112 views 1 answer
Description :

Answer :

The household energy meter is an integrating instrument.

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157 views 1 answer
Description :

Explain the “mitigation of power theft” and “faulty meter replacement” for energy conservation techniques to reduce commercial losses. 

Answer :

Energy conservation techniques to reduce commercial losses:  1. Mitigation of Power Theft: Power theft being the most important issue which all of the service providing utilities ... agricultural sector. Prepaid meters may prove effective measures against unauthorized abstraction of energy. 

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71 views 1 answer
Description :

State the function and shape of following parts used in induction type energy meter: i) Series magnet ii) Shunt magnet iii) Al disc iv) Brake magnet

Answer :

i) Series magnet: produce flux proportional to current (load current) of circuit and interact in the aluminum disc with flux produced by voltage magnet for torque production. Its shape is like letter U.  ii) ... : brakes the motion of the aluminum disc or slows it down. Its shape is like letter C. 

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80 views 1 answer
Description :

State the meaning of creeping error in 1 phase energy meter.

Answer :

Creeping error: It is defined as the slow and continuous rotation of the disc of the energy-meter when only pressure coil is energized with no current in the current coil (load current = 0). ... magnet on this iron wire is sufficient to prevent continues rotation of the disc on no load condition.

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237 views 2 answers
Description :

List any four errors in induction type energy meter. Give method of compensation for each.

Answer :

Errors in Induction Type Energy Meter with their Compensation:  1) Error due to friction: This error can be compensated by the additional shading band provided on the shunt electromagnet.  2) Phase ... error: This error can be compensated by providing a flux diverter' to the current magnet. 

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997 views 1 answer
Description :

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is (A) 1.2 kW (B) 1 kW (C) 600 W (D) 500 W

Answer :

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is 500 W

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152 views 1 answer
Description :

Draw a block diagram of electronic energy meter. Write function of each block.

Answer :

Electronic Energymeter  Functions of components/blocks: - CT reduces current to reasonable value for current scaling network. - Voltage & current scaling networks reduce proportionally the voltage ... ADC converts the square wave frequency analog output to display the energy in watthour.

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189 views 1 answer
Description :

Draw a neat sketch of 1-ph induction type energy meter and write operating principle of it. 

Answer :

Operating Principal:- The disc is placed between the two-flux due to pressure coil and flux due to current coil, which will set up torque on the disc which is proportional to power causing the ... is proportional to voltage, the second carries a current coil so its flux is proportional to current.

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88 views 1 answer
Description :

Draw and describe working of electronic energy meter.

Answer :

working of electronic energy meter:- 1. CT reduces current to reasonable value for current scaling network. 2. Voltage & current scaling networks reduce proportionally the voltage & ... The ADC converts the square wave frequency analog output to display the energy in watthour. 

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71 views 1 answer
Description :

What is meant by energy meter constant?

Answer :

Energy Meter Constant  A fixed value which is used when converting meter readings to actual energy use, especially when potential transformers and similar types of equipment are used in metering. For example, K=--------rev/Kwh

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67 views 1 answer
Description :

With neat diagram explain calibration of energy meter by direct loading method.

Answer :

Calibration of Energy Meter by Direct Loading Method:  There are three methods for testing/calibration:  1. Long period dial test  2. Using rotary sub- standard meter  3. Using precision grade instruments  All ... of substandard meter in kWh  Then % error = [(D - DS)/DS] x 100

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822 views 1 answer
Description :

Why energy meter is integrating type measuring instrument?

Answer :

Energy Meter is Integrating Type Measuring Instrument: Energy meter is used for measurement of energy, which is obtained by integration (summation) of power supplied over the particular time duration, hence it the integrating type measuring instrument. 

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73 views 1 answer
Description :

Write any two advantages of digital energy meter.

Answer :

Advantages of Digital Energy Meter: 1) Easy to read. 2) High accuracy 3) High resolution. 4) No frictional losses as there are no moving parts. 5) No requirement for external adjustments. 6) Large ... due to absence of moving parts. 7) Highly efficient. 8) Very much compact. 9) Good reliability.

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57 views 1 answer
Description :

Phantom loading for testing of energy meter is used (A) to isolate the current and potential circuits (B) to increase power loss during testing (C) for meters having low current ratings (D) to test meters having a large current rating for which loads may not be available

Answer :

B

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1.3k views 2 answers
Description :

Answer :

In a shaded pole motor, the shading coil usually consist of a single turn of heavy copper wire which is short-circuited and carries only induced current.

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71 views 1 answer
Description :

The meter which does not have any component in it to provide control torque is (A) Electrodynamometer for current measurement (B) Electrodynamometer for voltage measurement (C) Electrodynamometer for power measurement. (D) Electrodynamometer for power factor measurement.

Answer :

The meter which does not have any component in it to provide control torque is Electrodynamometer for power factor measurement.

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132 views 1 answer
Description :

Answer :

For high value of diversity factor, a power station of given installed capacity will be in a position to supply more number of consumers.

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117 views 1 answer
Description :

Answer :

An induction meter can handle current up to 100 A.

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90 views 1 answer
Description :

What type of meter is used to measure current?

Answer :

Ammeter

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2.7k views 3 answers
Description :

Answer :

In a Weston frequency meter, the magnetic axes of the two fixed coils are perpendicular.

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81 views 1 answer
Description :

Answer :

In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of 0.5 Hz.

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191 views 1 answer
Description :

Answer :

In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at 120°.

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88 views 1 answer
Description :

Answer :

In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.

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195 views 1 answer
Description :

Answer :

The multiplier and the meter coil in a voltmeter are in series.

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147 views 1 answer
Description :

For measurement of radio frequency ac signals __________ type meter is used

Answer :

For measurement of radio frequency ac signals thermo-couple type meter is used

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131 views 1 answer
Description :

A moving coil of meter has 100 turns, and a length and depth of 10mm and 20mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carrier current capacity is 50 mA. The torque on the coil is

Answer :

A moving coil of meter has 100 turns, and a length and depth of 10mm and 20mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carrier current capacity is 50 mA. The torque on the coil is 200µNm

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338 views 1 answer
Description :

Answer :

A Weston frequency meter is moving iron instrument.

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62 views 1 answer
Description :

Answer :

The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.

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86 views 1 answer
Description :

Answer :

A power factor meter has one current circuit and two pressure circuits.

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54 views 1 answer
Description :

State the use of Lux Meter and Tachometer in energy audit.

Answer :

Use of lux meter – to measure intensity of light Use of tachometer – to measure speed

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15 views 1 answer
Description :

Copper shading is provided in energy meter to  (A) Bring flux exactly in quadrature with applied voltage (B) To increase speed of aluminium disc (C) To count the rotation (D) To balance the system from vibration 

Answer :

A

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3.2k views 1 answer
Description :

What is an RF Power Meter?

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46 views 0 answers
Description :

What does an electric meter measure?

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63 views 0 answers
Description :

Answer :

Induction type single phase energy meters measure electric energy in kWh.

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281 views 1 answer
Description :

Draw venture meter and write steps to measure flow rate.

Answer :

Venturi meter consists of three sections that is converging section, throat section and diverging section. The flow is introduced to the meter through the inlet with diameter D' . The inclined angle ... to 15o . Flow rate is proportional to the square root of the differential pressure.

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38 views 1 answer
Description :

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is (A) 9997 Ω (B) 10000 Ω (C) 997 Ω (D) 10003 Ω

Answer :

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is 9997 Ω

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126 views 1 answer
Description :

State the use of shunt and series resistance used in extension of meter.

Answer :

Use of shunt and series resistance: i) Use of shunt: To extend the range of Ammeter. ii) Use of series resistance: To extend the range of Voltmeter.

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62 views 1 answer
Description :

kWh meter is the electric meter that measures the amount of electrical _________ in kWh that was consumed in the house.  (A) Energy (B) Current (C) Voltage (D) None of the above

Answer :

kWh meter is the electric meter that measures the amount of electrical Energy in kWh that was consumed in the house. 

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70 views 1 answer
Description :

List variable flow meter. 

Answer :

1. Variable area : Rotameter 2. Variable head : a) Venturi b) Orifice c) Pitot tube d) Nozzle

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25 views 1 answer
Description :

working of distortion factor meter with block diagram

Answer :

Working : Initially the switch S is kept at position 1.The attenuator gets excluded and the bridge T network is adjusted for full suppression of fundamental frequency and hence we get ... is obtained on the meter.Thus the total rms distortion is indicated by the reading of attenuator. 

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635 views 1 answer
Description :

Principal of digital frequency meter.

Answer :

The basic block diagram of basic digital frequency meter (DFM) is shown in above figure. The signal whose frequency we have to be measured is first to be amplified through amplifier. The output of amplifier ... = Number of counts. t = Time interval between start and stop condition of the gate.

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107 views 2 answers
Description :

State one application of clip on meter.

Answer :

Clip-on meter is used to measure the High value AC current without breaking the circuit Or without opening the circuit.

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34 views 1 answer
Description :

State advantages & disadvantages of electromagnetic flow meter.

Answer :

Advantage: Provides wide linear range. 2) Ability to measure reverses flow. 3) Gives rapid response to flow changes. 4) No obstruction is created to flow. 5) It can handle corrosive as ... and pipe networks with relatively short inside diameters. 3) It is useful for electrically conducting fluid.

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58 views 1 answer
Description :

Compare variable head flow meter with variable area flow meter.

Answer :

Parameter Variable head flowmeter Variable area flowmeter Working principle Restriction or obstacle is placed in the path of flow to create a differential Pressure. The pressure ... viscous fluid slurries and dirty fluids. In laboratories and testing and production lines.

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72 views 1 answer
Description :

Describe principle of operation of Doppler type ultrasonic flow meter with diagram. 

Answer :

Diagram: Working:  The flow meter consists of a crystal transducer mounted outside the pipe in which flow is to be measured. This transducer is a piezoelectric crystal which ... , so the frequency of the reflected wave is shifted to particle velocity, according to Doppler principle.

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107 views 1 answer
Description :

Draw the diagram and explain the working of ferrodynamic type frequency meter. 

Answer :

Ferrodynamic type frequency meter: (Electrical resonance type frequency meter): It consists of a fixed coil. The supply whose frequency is to be measured is connected across it. This coil ... so selected that the moving coil takes up a convenient position when frequency is of normal value. 

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4.3k views 1 answer
Description :

With a neat sketch explain working of 1 phase dynamometer type power factor meter.

Answer :

Working of 1 phase dynamometer type power factor meter : The current coil is connected in series with load. Two pressure coils marked as A and B are connected across the supply terminals ... becomes stationary and the pointer shows steady deflection corresponding to the power factor of the load. 

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103 views 1 answer
Description :

Write the working of L-C-R meter with suitable sketch.

Answer :

LCR meter: A LCR meter (Inductance L, Capacitance C, and Resistance R) test equipment used to measure the inductance, capacitance and, resistance of a component. It works on the principle ... relative change in magnitude of the repetitive variations of the voltage and current known as amplitudes.

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56 views 1 answer
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