Recent questions tagged ac

1 answer 27 views

AC power plugs and sockets

asked Jul 6 in Wikipedia by Shimroz123
1 answer 8 views

AC adapter

asked Jul 6 in Wikipedia by Shimroz123
1 answer 9 views

AC power

asked Jul 6 in Wikipedia by Shimroz123
1 answer 29 views

Is the power line voltage available in our homes a dc or an ac voltage?

asked Jun 29 by Shimroz123
1 answer 18 views

AC Circuits with Resistance but No Reactance

asked May 26 by Shimroz123
1 answer 14 views

What is the need of polarity marking in polyphase AC circuits?

asked Sep 7, 2018 by Shimroz123
1 answer 17 views

Explain how sinusoidal AC voltage is generated by using simple one loop generator.

asked Sep 7, 2018 by Shimroz123
1 answer 8 views

‘PMMC instrument is not suitable to measure AC quantity’. State the reason.

asked Sep 6, 2018 by Shimroz123
1 answer 125 views

How range of A.C. ammeter & A.C. voltmeter is extended? Draw suitable diagram.

asked Sep 5, 2018 by Shimroz123
2 answers 24 views

State any four advantages of A. C. over D. C . 

asked Sep 4, 2018 by Shimroz123
2 answers 74 views

UNIT 1 fundamentals of AC rotating machine Contents 1.1 Introduction 1.2 Advantages 1.3 Parts of AC machines 1.4 Synchronous speed 1.5 AC winding 1.6 Winding factor (Coil pitch and distributed winding) 1.7 Distribution factor 1.8 EMF equation of alternator or generator 1.9 Numericals 1.10 Harmonic 1.11 Slot harmonics 1.12 Harmonics minimization

asked Aug 25, 2018 in Electrical Machine by Notes
1 answer 58 views
2 answers 360 views

Do you think is DC better than AC to transmit energy?

asked Aug 11, 2018 in Electric Power Transmission by nbattack
0 answers 66 views

Write short notes on 3 phase AC system.

asked Aug 11, 2018 in Electrical Engineering by Shimroz
2 answers 317 views

Distinguish between AC and DC.

asked Aug 8, 2018 by Quiz
0 answers 94 views

The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of A) 10 kHz B) 10 Hz C) 5 kHz D) 5 Hz 

asked Jun 18, 2018 in Power Electronics by Shimroz123
1 answer 37 views

 An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

asked Jun 18, 2018 in Electronics Engineering by Shimroz123
1 answer 21 views

The main advantage of AC over DC is:  (A) Conversion flexibility from one voltage level to other (B) AC can be easily converted into DC by using a rectifier (C) AC is easy to maintain & can be easily distributed at long distances (D) All of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 205 views

An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to  (1) 1.414 times dc sensitivity (2) dc sensitivity (3) 0.9 times dc sensitivity (4) 0.707 times dc sensitivity

asked Apr 30, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 19 views

The ac bypassing of RF by CF in a common emitter configuration :  (A) increases ac signal across emitter -base junction (B) decreases ac signal across emitter -base junction (C) decreases voltage amplification (D) stabilizes the Q -point

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 53 views
1 answer 58 views

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

asked Apr 29, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 32 views

A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance to remain constant immediately after the fault, acceleration of the generator rotor is

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 27 views

Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above

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

The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 20 views

In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 224 views

Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 49 views

An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 29 views

A parallel AC. circuit in resonance will?

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

In an A.C. circuit power is dissipated in?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 97 views

The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

In AC. circuits, laminated iron is invariably used in order to?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 49 views

In an AC. circuit, a low value of kVAR compared with kW indicates?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 83 views

The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
2 answers 38 views

Pure inductive circuit takes power from the A.C. line when?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

In any A.C. circuit always?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

All the rules and laws of D.C. circuit also apply to A.C. circuit containing?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.

asked Mar 24, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken?

asked Mar 21, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 33 views

How is a thyristor used to convert AC to DC?

asked Mar 19, 2018 in Thyristor by Quiz
1 answer 109 views

What is the difference between an AC and DC generator?

asked Mar 15, 2018 in Electrical Machine by Quiz

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