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 Various adjustments in an energy meter include light load or friction, lag and creep, overload and voltage compensation.

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1 answer 17 views

Light load adjustments for induction type energy meters are usually done at   (a) 10% of full load current (b) 5% of full load current (c) 50% of full load current (d) 1% of full load current 

asked May 13, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 37 views

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.

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 11 views

In an induction type energy meter, the steady speed attained by the rotating disc is  1. Proportional to the deflecting torque. 2. Proportional to the resistance of the path of eddy currents. 3. Inversely proportional to the effective readings of disc from its axis. 4. Inversely proportional to the square of brake magnet flux.  Which of the above are correct ?

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
0 answers 40 views

If an energy meter disc makes 10 revolutions in 100 seconds when a load of 450W is connected to it, the meter constant in revolutions per kWh is  A) 1000 B) 500 C) 1600 D) 800

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
0 answers 58 views

An energy meter has a constant of 600 rev/kWh. If the meter makes 10 revolutions in 20 s, what is the load in kW?  (A) 0.75 kW (B) 1.5 kW (C) 3 kW (D) 6 kW 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 23 views

The constant of a given energy meter is 500 revolution/kWh. At the test 4.4 kW full load, meter completes 50 revolutions in 86 seconds. The percentage error of the meter is (a) –4.86% (b) 4.86% (c) 2.0% (d) 3.0%

asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 9 views

Energy meter runs slowly even if power is not used. This error is called (a) Speed error (b) Phase error (c) Creeping error (d) None of these

asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 11 views

The disc of domestic supply energy meter is made of which material ? (a) Zinc (b) Copper (c) Aluminium (d) Silver 

asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 19 views

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

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 28 views

It is desired to convert a 0-1000A meter movement, with an internal resistance of 100 ohms, into a 0-100mA meter. The required value of shunt resistance is about 

asked Mar 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 63 views

The magnitude of various voltage drops that occur in an alternator depends on?

asked Mar 18, 2018 in Alternator by Shimroz123
1 answer 10 views

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

asked Sep 6, 2018 by Shimroz123
2 answers 3 views

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

asked Sep 6, 2018 by Shimroz123
1 answer 15 views

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

asked Sep 5, 2018 by Shimroz123
1 answer 9 views

In a single phase induction energy meter, in order to obtain true value of energy, the shunt magnetic flux should lag behind the applied voltage by   (a) 90o (b) 0o (c) 45o (d) 60o

asked May 13, 2018 in Instrumentation and control by Shimroz123
1 answer 29 views

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

asked Apr 25, 2018 in Instrumentation and control by Shimroz123
1 answer 8 views

 Damping torque used in energy meter is : - a) Electrostatic b) Electro magnetic c) Eddy Current d) None

asked Apr 14, 2018 in Instrumentation and control by Shimroz123
1 answer 15 views

The major cause for creeping in energy—meter is:  (1) Over compensation for friction (2) Vibrations (3) Stray magnetic fields (4) Excessive voltage across the potential coil

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
0 answers 25 views

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 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 70 views

The power in a 3-phase load is measured by two watt meters. If one watt meter reads zero, then the load power factor is (A) Zero (B) 0.5 (C ) 0.866 (D) unity 

asked Jun 4, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 18 views

In a particular meter, the deflecting torque is directly proportional to the current flowing through it, the type of meter is (a) moving coil (b) moving iron (c) induction (d) electro-static  

asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 24 views

A d.c. ampere-hour meter is rated at 5A, 250 V. The declared constant is 5 A sec/revolution. The constant in revolution/kwh will be (a) 2880 (b) 2680 (c) 2480 (d) 2280

asked May 25, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 23 views

A reading of 120 is obtained when a standard inductor was connected in the circuit of a Q-meter and the variable capacitor is adjusted to a value of 300 pF. A lossless capacitor of unknown value Cx is then connected in parallel with the variable capacitor and the same reading was obtained when the variable capacitor is readjusted to a value of 200 pF. The value of Cx in pF is  A) 100 B) 200 C) 300 D) 500

asked May 20, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 44 views

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.

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 6 views

The best method for measurement of temperatures of hot bodies radiating energy in the visible spectrum is (a) bolometer (b) optical pyrometer (c) thermocouple (d) thermopile 

asked May 25, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 29 views

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

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 13 views

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

asked Sep 6, 2018 by Shimroz123
1 answer 17 views

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

asked Sep 6, 2018 by Shimroz123
1 answer 10 views

Draw and describe working of electronic energy meter.

asked Sep 6, 2018 by Shimroz123
1 answer 8 views

What is meant by energy meter constant?

asked Sep 6, 2018 by Shimroz123
1 answer 30 views

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

asked Sep 6, 2018 by Shimroz123
1 answer 11 views

Why energy meter is integrating type measuring instrument?

asked Sep 5, 2018 by Shimroz123

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