menu search
person
thumb_up_alt 0 like thumb_down_alt 0 dislike
86 views

1 Answer

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
← Prev Question Next Question →

Related questions

Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
195 views 1 answer
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

thumb_up_alt 0 like thumb_down_alt 0 dislike
147 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
164 views 2 answers
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
88 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. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
103 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
178 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

thumb_up_alt 0 like thumb_down_alt 0 dislike
152 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
54 views 1 answer
Description :

Explain power in single phase AC circuit.

thumb_up_alt 0 like thumb_down_alt 0 dislike
75 views 0 answers
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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
229 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
281 views 1 answer
Description :

Illustrate with neat wiring diagram a single lamp control by two point method.

Answer :

Single lamp control by two point method:  This system is commonly used for stair case wiring. It consists of two way switches (the switch operates always in one of the two possible positions) the ... the person will change the position of switch S2, so that the lamp will be switched OFF'.

thumb_up_alt 0 like thumb_down_alt 0 dislike
101 views 1 answer
Description :

Answer :

Necessary conditions required to be satisfied in order to ensure successful parallel operation of single phase transformers:  1. Only transformers having the same phase displacement between primary and secondary ... . 7. The phase sequence must be followed strictly on HV and LV side connection.

thumb_up_alt 0 like thumb_down_alt 0 dislike
119 views 2 answers
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
121 views 1 answer
Description :

Answer :

In two part tariff, variation in load factor will affect operating or running charges.

thumb_up_alt 0 like thumb_down_alt 0 dislike
61 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. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
635 views 1 answer
Description :

In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be?

Answer :

In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be 0.5.

thumb_up_alt 0 like thumb_down_alt 0 dislike
201 views 1 answer
Description :

In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was?

Answer :

In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was unity.

thumb_up_alt 0 like thumb_down_alt 0 dislike
699 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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
237 views 2 answers
Description :

State the application of phase sequence indicator; clip on ammeter, frequency meter & P.F. meter.

Answer :

Phase Sequence Indicator:  1. For finding correct phase sequence of supply  2. For obtaining exact instant of parallel operation of alternators.  3. For obtaining reversal of rotation ...  4. In electroplating industries   5. In various processes industries for measuring power factor

thumb_up_alt 0 like thumb_down_alt 0 dislike
125 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
81 views 1 answer
Description :

Why is a capacitor used in a single phase motor and not in three phase motor ?

Answer :

In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.

thumb_up_alt 0 like thumb_down_alt 0 dislike
138 views 6 answers
Description :

Explain the working of a single phase capacitor start induction motor. 

Answer :

Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc

thumb_up_alt 0 like thumb_down_alt 0 dislike
194 views 2 answers
Description :

Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.

Answer :

Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.

thumb_up_alt 0 like thumb_down_alt 0 dislike
233 views 1 answer
Description :

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he

Answer :

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he 0.52

thumb_up_alt 0 like thumb_down_alt 0 dislike
252 views 1 answer
Description :

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

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
85 views 1 answer
Description :

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm

Answer :

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm

thumb_up_alt 0 like thumb_down_alt 0 dislike
703 views 1 answer
Description :

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%

Answer :

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 11%

thumb_up_alt 0 like thumb_down_alt 0 dislike
279 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
151 views 2 answers
Description :

Answer :

If a single phase induction motor runs slower than normal, the most likely defect is worn bearings.

thumb_up_alt 0 like thumb_down_alt 0 dislike
123 views 1 answer
Description :

Answer :

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a magnetic relay.

thumb_up_alt 0 like thumb_down_alt 0 dislike
177 views 1 answer
Description :

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?

Answer :

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 not start at all.

thumb_up_alt 0 like thumb_down_alt 0 dislike
124 views 1 answer
Description :

The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be?

Answer :

The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be at the slot edge where coil enters or comes out of the slot.

thumb_up_alt 0 like thumb_down_alt 0 dislike
93 views 1 answer
Description :

Answer :

In a single phase motor the centrifugal switch disconnects auxiliary winding of the motor.

thumb_up_alt 0 like thumb_down_alt 0 dislike
168 views 1 answer
Description :

How does a single phase induction motor work?

Answer :

As we know that single phase induction is not self started because for self started we require atleast two revolving field but single phase induction motor has only one. So we provide extra ... 1phase IM classified as split phase IM, capacitor start capacitor run, capacitor start induction run.

thumb_up_alt 0 like thumb_down_alt 0 dislike
99 views 1 answer
Description :

Describe the gate circuit for a single phase full converter.

thumb_up_alt 0 like thumb_down_alt 0 dislike
63 views 0 answers
Description :

Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it. 

Answer :

Circuit Diagram: Waveforms:

thumb_up_alt 0 like thumb_down_alt 0 dislike
305 views 1 answer
Description :

Single phase transformer

Answer :

Single phase Transformer Transformer

thumb_up_alt 0 like thumb_down_alt 0 dislike
239 views 1 answer
Description :

Explain MCB and ELCB with connection diagram supplying single phase load. 

Answer :

OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
274 views 1 answer
Description :

State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders

Answer :

Application Suitable Single Phase Motor Table Fan 1) Capacitor split phase motor 2) Capacitor start capacitor run motor Mixers and Grinders 1) Universal motor 2) A.C. Series motor

thumb_up_alt 0 like thumb_down_alt 0 dislike
59 views 1 answer
Description :

Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.

thumb_up_alt 0 like thumb_down_alt 0 dislike
78 views 0 answers
Description :

working principle of single phase motor

Answer :

The Stator of single phase induction motor houses two windings  1. Main (Running) winding 2. Auxiliary (Starting ) winding Rotor of single phase induction motor is ... with starting winding or a capacitor may be permanently connected in series with Auxiliary (Starting ) winding.

thumb_up_alt 0 like thumb_down_alt 0 dislike
112 views 1 answer
Description :

Explain construction and working principle of single phase transformer.

Answer :

A single phase transformers is an electrical device that accepts single-phase AC power and outputs single-phase AC. PRINCIPLE... The single-phase transformer works on the principle of ... and secondary windings. Thin steel laminations shall be employed to prevent power losses from the core.

thumb_up_alt 0 like thumb_down_alt 0 dislike
530 views 4 answers
Description :

State advantages of three phase over single phase.

Answer :

Advantages of 3-phase system over 1-phase system: -  1. More output: For the same size, output of poly-phase machines is always higher than single phase machines.  2. Smaller size: For ... are self- starting: The three phase ac motors are self starting, while single phase induction motor are not.

thumb_up_alt 0 like thumb_down_alt 0 dislike
2.8k views 4 answers
Description :

Answer :

Single phase induction motor usually operates on 0.6 power factor lagging.

thumb_up_alt 0 like thumb_down_alt 0 dislike
103 views 1 answer
Description :

An unexcited single phase synchronous motor is ?

Answer :

An unexcited single-phase synchronous motor is reluctance motor.

thumb_up_alt 0 like thumb_down_alt 0 dislike
111 views 1 answer
Description :

What are the five types of single phase motors used in the industry?

thumb_up_alt 0 like thumb_down_alt 0 dislike
71 views 0 answers
Description :

write short notes on single phase system.

Answer :

A "phase" in an electrical system is often referred to as the waveform (may be voltage or the current) of the power supply. The waveform in an AC system is typically ... domestic household or commercial supplies and street lighting. Industrial supplies requires three phase electrical supply .

thumb_up_alt 2 like thumb_down_alt 0 dislike
91 views 1 answer
Description :

three phase to single phase cycloconverter

Answer :

three phase to single phase cycloconverter

thumb_up_alt 1 like thumb_down_alt 0 dislike
428 views 1 answer
...