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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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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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Description :

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

Answer :

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

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Answer :

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

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Answer :

The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.

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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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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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Answer :

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

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Description :

What is the difference between line and phase current?

Answer :

The currents flows through phase lines is called line voltage and currents flows from phase to neutral line is called phase current

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Description :

What is the difference between line and phase voltage?

Answer :

Line voltage  is  voltage  between two  phases R &Y  (415 v)  while  phase  voltage  is  the  voltage  between  one  phase and  a neutral  B &  N   (240 v).

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Description :

The power consumed in a circuit element will be least when the phase difference between the current and voltage is?

Answer :

The power consumed in a circuit element will be least when the phase difference between the current and voltage is 90°.

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Explain power in single phase AC circuit.

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Description :

In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?

Answer :

In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.

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229 views 1 answer
Description :

Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Answer :

(i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.

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Description :

When the phase difference between two sinusoidal quantities is 90° they are said to be ______ A) Phase right angle B) Phase quadrature C) Phase sinuright D) None of these

Answer :

When the phase difference between two sinusoidal quantities is 90° they are said to be Phase quadrature

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Description :

Answer :

In a low power factor wattmeter the pressure coil is connected to the load side of the current coil.

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Description :

Answer :

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

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Description :

The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that?

Answer :

The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that both waves must have same frequency.

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Answer :

The power factor of a single-phase induction motor is usually lagging.

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What is the difference between a cable and a conductor?

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Describe the difference between an open circuit and a short circuit.

Answer :

Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit

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A differential relay measures the vector difference between two or more similar electrical quantities.

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What is the difference between a soft start and a VFD?

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What is the difference between an anode and a cathode?

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The anode is positively charged electrode and the cathode is negatively charged electrode.

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What is the difference between an insulator and a dielectric?

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Dielectric is the another name for insulator.

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What is the difference between a sensor and a transducer?

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https://electronics2electrical.com/19108/

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What is the difference between a microcontroller and a microprocessor?

Answer :

Compare microprocessor and microcontroller Microprocessor Microcontroller 1)Inbuilt RAM and ROM 1)Do not have inbuilt RAM or ROM 2)Inbuilt timer 2)Doesn't have inbuilt timer ... same memory 6)Many Multifunction pins on the IC  6)less multifunction Pins on IC.

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Counter counts only when the trigger is applied and timer counts continuously with some equal delay.

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What is the difference between a switch and a relay?

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Switch is simply a mechanical contact mechanism and relay is a electromagnetic switch . Switch can be direct mechanically turn on and off but relay can be operated by energising coil .

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State the difference between energy conservation and energy audit. 

Answer :

energy conservation Energy audit It is reducing the growth of energy consumption by avoiding unnecessary usage of energy It is an inspection, survey & analysis of energy flows ... Various measuring instruments, with proper sensing elements are required for the energy audit. 

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Describe the difference between direct and alternating current.

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What is the difference between synchronous and asynchronous motors?

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