Answer Posted / arun

if the voltage is less than nominal lagging..equal to
nominal unity..higher than nominal..leading pf

Why a tesa lamp is glow between two phase?

2005

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1.25 kg of hydrogen are burnt with stiochiometric air, the mass of air in kg required is

2109

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how can we save enegry by using VFD for Resiprocating Air compressor which is having more unloading running hours

2295

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what is the function and use of cable differential protection relay?

2916

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how to select automotive wire by mathematical equation with given current, vlotage and resistance

2356

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How the over load setting for HT Motors calculated-provided in Numerical Relay

1814

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What the main causes of transient interruptions on Over-Head Distribution Lines?

2143

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i wasted one year for the job after completed my btech what can i say about 1year time in interview

2113

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ii) A shunt motor supplied at 230V, runs at 900 rpm when the current is 30A. The resistance of the armature is 0.4 ohms. Calculate the resistance required in series with the armature to reduce the speed to 600 rpm, assuming that the armature current is then 20A. [12]

2370

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how to calculate the surge level of surge suppressors related to the SF6 cicuit breakers?

1971

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I have a reading off 1.5ohms at my mem my main c/b is rated at 40/6 amps in a domestic house and i was told to change it to a b curve c/b is this ok

1670

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54 Comments Alok and Bhanu play the following min-max game. Given the expression N = 38 + X*(Y – Z) where X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it. Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z). Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable. Assuming both play to their optimal strategies, the value of N at the end of the game would be?

2187

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Explain the operation of grid connected central solar inverter ?

1538

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In case of salient pole alternator when number of poles are 4 or more than 4 it helps the flux wave to be sinusoid as air gap length is increased from center to tip , but if the number of poles are 2 how does the flux wave is sinusoidal?

1977

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When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

2155

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