Application wise, where we should use AC motors and where
we should DC motors?
Answer Posted / sunny
not confirm
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
Why do we apply both Differential and REF (HV and LV) protection schemes on YNyn configuration of a transformer?
which type of effect of turbine and generator reverse power protection ?
When a square wave is applied to primary of a transformer then what will be output wave form of secondary ?
In a tap changing transformer where is the tap connected, is it connected in the primary side or secondary side?
distribution is maximum done by a)radial b)network c) parallel d)b & c
Tell me in detail about c.t. And p.t. ?
briefly explain the main blocks found in a microprocessor based system
The Howland current source produces a A Unidirectional floating load current B Bidirectional single-ended load current C Unidirectional single-ended load current D Bidirectional floating load current
HOW TO WORK A VFD?SAY SIMPLE METHOD
Why cables and busbar both needed in LT Panels?
Why field rheostat is kept in minimum position?
what is subtransient , transient and steady stateac components
1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.
WHY IS THE EARTH FAULT CURRENT ALWAYS LESS THAN THE NORMAL CURRENT??
1600 KVA ka transformer hi aghar lt side par 800A aur voltage 420 ho to HT side ki cable ki rating keya ho gi?