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An induction meter can handle current up to 100 A.

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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 :

What type of meter is used to measure current?

Answer :

Ammeter

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2.7k views 3 answers
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 :

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 :

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 :

In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized

Answer :

In the induction type directional over current relay, when a short-circuit occurs in the circuit power flows in reverse direction

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87 views 1 answer
Description :

Why does induction motor have high starting current?

Answer :

In induction motor , the flux produce is quadrature to the applied voltage. Since when we are going to start motor , there is no flux present inside . So in order to lets say compensate it ... times of current to further increase flux. So that is reason for high starting current in induction motor

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Description :

Answer :

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

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114 views 1 answer
Description :

Answer :

An induction wattmeter can be used for A.C. 

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78 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 :

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 :

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 :

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 :

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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Description :

Answer :

A Weston frequency meter is moving iron instrument.

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Description :

Answer :

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

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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 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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Description :

Answer :

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

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Description :

Answer :

The household energy meter is an integrating instrument.

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157 views 1 answer
Description :

Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.

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64 views 0 answers
Description :

Answer :

A direct current can be measured by a D.C. potentiometer in conjunction with a standard resistance.

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79 views 1 answer
Description :

Answer :

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

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281 views 1 answer
Description :

Answer :

For handling greater currents induction wattmeters are used in conjunction with current transformers.

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85 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 :

The disc of an instrument using eddy current damping should be of conducting and non-magnetic material.

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218 views 1 answer
Description :

How can a magnetic field be used to generate an electric current?

Answer :

Magnetic  field  can  be  used  to  generate  electric  current  on  a  condition  that  it  is  on  a  rate  of  changing  magnetic  flux.  (Faraday's  law)

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96 views 1 answer
Description :

A change of 4% in the supply voltage to an induction motor will produce a change of approximately

Answer :

A change of 4% in the supply voltage to an induction motor will produce a change of approximately 8% in the rotor torque

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296 views 1 answer
Description :

In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will  (1) reduce to one-half (2) reduce to one-fourth (3) remain unchanged (4) increase four times

Answer :

In an induction motor if the flux density is reduced.to one-half, of its normal value then the torque will reduce to one-fourth

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245 views 1 answer
Description :

Answer :

The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it helps in reducing the tendency of the rotor teeth to remain under the stator teeth.

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124 views 1 answer
Description :

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?

Answer :

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because stator supply is not required to produce magnetic field.

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93 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 :

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 :

Answer :

Yes, Induction heating is used for both magnetic and non-magnetic materials.

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87 views 1 answer
Description :

how can we reverse the direction of rotation of three phase induction motor ?

Answer :

The direction of rotation of three phase induction motor can be reversed by plugging i.e by changing any two out of three phases of the supply to the stator of the Induction motor terminal.

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108 views 1 answer
Description :

Answer :

if induction motor rotates exceed than its synchronous speed, it acts as a generator.

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54 views 1 answer
Description :

List out any four effects of electric current used in measuring instruments & write name of meter working on it.

Answer :

Effects of Electric Current used in measuring instruments:  1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc.  2. Electromagnetic induction ... . Electrostatic effect: Voltmeters.  5. Hall Effect: Flux meter, Poynting vector wattmeter.

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581 views 1 answer
Description :

Answer :

The gravity controlled instrument has crowded scale because current is proportional to sine of deflection angle.

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180 views 1 answer
Description :

An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is (A) 5.06 kW (B) 0.3 kW (C) 100 kW (D) 83.33 kW

Answer :

An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is 83.33 kW

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143 views 1 answer
Description :

In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an external resistance in the rotor circuit and the slip is 0.15. If the rotor winding resistance per phase is 0.2 Ω, the external resistance is (A) 0.2 Ω (B) 0.3 Ω (C) 0.4 Ω (D) 0.5 Ω

Answer :

In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an external resistance in the rotor circuit and the slip is 0.15. If the rotor winding resistance per phase is 0.2 Ω, the external resistance is 0.3 Ω

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111 views 1 answer
Description :

Answer :

An induction motor has relatively high power factor at near full load.

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67 views 1 answer
Description :

Why starter is required for starting an induction motor?

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102 views 0 answers
Description :

The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?

Answer :

Ns         equals        f/pair pole 50/4      - 12.5

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136 views 2 answers
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
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