Can you help by answering this question?

Slew rate is expressed in :

9 views
in Instrumentation and control by

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

1 Answer

0 votes
by

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 90o

Related questions

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 11 views

 In a household single phase induction type wattmeter, the meter can be reversed by: - a) reversing the supply terminals b) reversing the load terminal c) opening the meter connection and reversing either the potential coil terminals or current coil terminals d) opening the meter and reversing the connection of both the potential coil terminals and current coil terminals

asked Apr 14, 2018 in Instrumentation and control 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
1 answer 17 views

The current coil of a single-phase energy meter is wound on (a) One limb of the laminated core (b) Both the limbs of the laminated core with same number of turns (c) Both the limbs of the laminated core with different number of turns (d) The centre of the limb on the laminated core

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

The meter constant of a single-phase 230 V induction watt hour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10 A of 0.9 pf lagging will be

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
0 answers 53 views

The meter constant of a single phase 240 V induction watt hour meter is 400 revolutions per KWhr. The speed of the meter disc for a current of 10 A of 0.8 pf, lagging will be  (A) 12.8 rpm (B) 16.02 rpm (C) 18.2 rpm (D) 21.1 rpm 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 14 views

A true rms reading voltmeter uses two thermocouple in order: -  a) to increase sensitivity b) that a second thermocouple cancels out the no linear effect of the first thermocouple c) to prevent drift in the dic. Amplifier d) all of the above

asked Apr 10, 2018 in Instrumentation and control by Shimroz123
0 answers 31 views

A single phase energy meter has a constant of 1200 revolution/kWh. When a load of 200 W is connected, the disc rotates at 4.2 revolutions per min. If the load is on for 10 hours, the meter records an excess of   (a) 0.1 kWh (b) 0.2 kWh (c) 1.0 kWh (d) 2.0 kWh 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

One single-phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant is 400 rev/kWh. The power factor of the load is

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve (A) low starting torque (B) quick acceleration (C) high efficiency (D) reduced size

asked May 17, 2018 in Induction Machine by Shimroz123
1 answer 23 views

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then (A) the flux is constant (B) the flux first decreases and then increases in the same direction (C) the flux increases and decreases in the opposite direction with the same magnitude (D) current flows through the rotor

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 31 views

In order to have a lower cost of electrical energy generation the load factor  (1) and the diversity factor should be low (2) should be low but the diversity factor should be high (3) should be high but the diversity factor should be low (4) and the diversity factor both should be high

asked Apr 29, 2018 in Electric Power Generation by Shimroz123
1 answer 58 views

Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting:  (1) A capacitor across the mains (2) A capacitor in series with the machine (3) A capacitor is series with the auxiliary winding (4) Equal value capacitors in series with the main and the auxiliary windings

asked Apr 9, 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
2 answers 3 views

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

asked Sep 6, 2018 by Shimroz123
0 answers 19 views

What is the value of form factor in connection with single phase alternating supply systems ? (A) 1.01 (B) 1.11 (C) 1.21 (0) 1.31

asked Apr 14, 2018 in Electrical Engineering 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 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
1 answer 47 views

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%

asked Apr 25, 2018 in Instrumentation and control by Shimroz123
1 answer 20 views

In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

In a capacitor start single-phase induction motor, the capacitor is connected in:  (A) series with the main winding (B) series with the auxiliary winding (C) series with both the windings (D) parallel with the auxiliary winding .

asked Apr 9, 2018 in Electrical Engineering 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 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 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 25 views

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?

asked Mar 20, 2018 in Induction Machine by Shimroz123
1 answer 13 views

For a single phase capacitor start induction motor, which of the following statements is valid?  A) The capacitor is used for power factor improvement B) The direction of rotation can be changed by reversing the main winding terminals C) The direction of rotation cannot be changed D) The direction of rotation can be changed by interchanging the supply terminals

asked May 17, 2018 in Induction Machine by Shimroz123
0 answers 11 views

The no~load current of a single phase induction motor is around _____% of full load current.  (1) 10 (2) 20 (3) 40 (4) 80

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

In a three-phase system, when the loads are perfectly balanced, the value of neutral current is equal to: A. Zero B. One-third of the maximum value C. Two -third of the maximum value D. The maximum value

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
0 answers 8 views

In a second order system the value of resonant peak will be unity when the damping ratio has a value of  A) Zero B) Unity C) 0.707 D) 0.414

asked Apr 9, 2018 in Control System by Shimroz123
1 answer 24 views

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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 24 views

A single-phase transformer has a turns ratio of 1 :2 and is connected to a purely resistive load as shown in the figure. The magnetizing current drawn is 1A, and the secondary current is 1A. Ifcore losses and leakage reactances are neglected, the primary current is  A)1.41A B)2A C) 2.24A D)3A

asked May 20, 2018 in Transformer by Shimroz123
1 answer 16 views

A single transistor can be used to build which of the following digital logic gates : - a) AND gates b) OR gates c) NOT gates d) NAND gates

asked Apr 14, 2018 in Instrumentation and control by Shimroz123
0 answers 22 views

In slip-energy recovery scheme of converter-fed 3-phase induction motor, super synchronous speeds are possible by (A) injecting voltage into the stator (B) injecting voltage into the rotor (C) extracting voltage from the stator (D) extracting voltage from the rotor. 

asked Jun 4, 2018 in Electrical Machine by Shimroz123
1 answer 14 views

In the capacitor-start, capacitor-run single-phase induction motor (A) two capacitors are connected across the main winding (B) when the centrifugal switch opens, the permanent capacitor is left in the auxiliary winding circuit (C) when the centrifugal switch opens, the permanent capacitor is left in the main winding circuit (D) two capacitors are connected across the auxiliary winding.

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 40 views

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

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 515 views

A single-phase induction motor with only the main winding excited would exhibit the following response at synchronous speed  (A) Rotor current is zero (B) Rotor current is non-zero and is at slip frequency (C) Forward and backward rotating fields are equal (D) Forward rotating field is more than the backward rotating field

asked May 18, 2018 in Induction Machine by Shimroz123
1 answer 18 views

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

asked Apr 29, 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
1 answer 5 views

False () function ____.  a) Returns the logical value of false b) Returns the logical value of true c) Returns the actual value d) None of the above

asked May 13, 2018 in Computer Engineering by Shimroz123

Welcome to electronics2electrical.com here you can ask questions related to electrical, electronics, mechanical, telecommunication, instrumentation, computer, mathematics, physics etc.
Be respectful to all the members. Do not copy and paste the answers from other websites which have copyright content. While asking question give full details about it.

Categories

Most popular tags

power motor dc circuit transformer voltage current used system phase resistance factor synchronous load ac energy induction electric generator series frequency between speed capacitor use electrical meter line difference control type mosfet transmission magnetic plant high single instrument bjt unit source advantages function diode and machine winding field define torque parallel amplifier supply shunt thyristor motors electricity arduino maximum time relay armature problem value on transformers types coil diagram state flow ratio material three formula starting direction theorem method emf operating efficiency digital wave microprocessor test instruments inductance loss measure operation connected signal low applications effect single-phase network temperature working constant losses different law wattmeter measuring compare controlled breaker drive device logic rc full switch flux wire resistivity disadvantages free of materials machines angle force converter conductor transistor gain open protection scr core measurement number bridge principle generators reactance circuits negative the friction iron loop short pole battery conservation steam resistors hysteresis computer using analog lines secondary station gate a rectifier inverter linear induced relays nuclear capacitance basic characteristics design direct work rotor electronics ammeter forces diesel damping rlc connection factors capacitors minimum insulation moving regulation running self systems air fault range main stability quality starter igbt eddy alternator ideal rl average 3-phase plants arc thermal error fuzzy biasing dielectric pressure balanced superposition errors copper rotation feedback impedance measured electronic electrons charge inductive transfer explain start off back curve over solar is three-phase tariff locomotive peak bias zener engineering commutator surge conductors rating universal potentiometer density permanent mechanical transducer capacity memory adc excitation two fuse pure harmonics application semiconductor inductor internal pmmc reaction welding resonance traction permeability breakers rms designed electromagnetic si generation brushes switching capacitive shaded rate 1 distribution resistor methods delta star oscillator reluctance simplification algebra 8085 boolean weston dynamometer insulating strength installation definition fuel heating earth units
...