Recent questions tagged supply

1 answer 7 views

What is need of regulated power supply?

asked Sep 4, 2018 by Shimroz123
1 answer 35 views

Define phase sequence of three phase supply with waveforms. What is normal phase sequence? Which 3 standard colours are used to denote the phase sequence?

asked Aug 11, 2018 in Basic electrical and electronics engineering by Quiz
0 answers 49 views
1 answer 58 views
1 answer 160 views

What is the Power Supply specification for 8085AH microprocessor? A) Single +5V supply with 10% voltage margins B) Dual +5V supply with 10% voltage margins C) Single +10V supply with 5% voltage margins D) Dual +5V supply with 5% voltage margins 

asked Jun 18, 2018 in Microprocessors and Microcontrollers by Shimroz123
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 48 views

Two 100W, 200V lamps are connected in series across a 200V supply. The total power consumed by each lamp will be in Watts

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

A change of 4% in the supply voltage to an induction motor will produce a change of approximately

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 23 views

We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

What will happen if the primary of a transformer is connected to D.C. supply?  (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn 

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 10 views

The supply for arc welding is : 

asked Apr 29, 2018 in Utilization of electrical energy by Shimroz123
1 answer 80 views

Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 236 views

The time period of third harmonic of power supply frequency, in milliseconds, is (A) 20 (B) 3.33 (C) 6.66 (D) 60

asked Apr 28, 2018 in Network Analysis by Shimroz123
1 answer 23 views

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then (A) It would over-run the other alternator (B) Its rotor will fall back in phase with respect to the other machine (C) Its portion of share in load will increase (D) Its power factor would be decreased.

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 226 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 25 views

In a three-phase supply floating neutral is undesirable because it way give rise to?

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

The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of?

asked Mar 25, 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
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 28 views

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

asked Mar 20, 2018 in Synchronous machine by Shimroz123
0 answers 37 views

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

asked Mar 20, 2018 in Synchronous machine by Shimroz123
1 answer 25 views

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 23 views

Why does a transformer only work with an AC supply?

asked Mar 14, 2018 in Electrical Engineering by Quiz
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