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If the characteristic Impedance is equal to load Impedance then…… a) voltage will be increased b) power transmission is zero c) …… d) max. power is transmission to load
2 5623ynchronous M/C with under excitation with reactive power absorption , acts as a) synch. Motor b) synch gen c) synchr capacit
4 5408Why size of HT cable is less then LT cable inspite of the fact that voltage is higher in HT cable?
L&T,
2 8213A 25MVA 3300/400V T/F is termed as per winding is …… a) primary 3300V & Secondary 400V b) primary 3300V & low voltage winding 400V c) High voltage winding 3300V & Secondary 400V d) High voltage winding 3300V & low voltage winding 400V
4 6569Resistor switching is used in which type Circuit Breaker ? a) oil filled CB b) Air blast CB c) Gas filled CB
11 31588In EHV tranm. The conductors are …….. a) Cu roads b) Cu bars with Si c) Cu tube with Si plate
2 5611the max. power will be transferred if …… a) sending end vol. is high b) receiving end v is high c)…….. d) corona loss is least
2 5488. The string effcy in AC sys is 80% Then for same power, the string effcy in dc sys is a) less than 80% b) 80% c) more than 80% d) zero
1 2712The temperature rise in the sys, which leads to ….. a) Increases stress& length b) increases stress but decreases length c) Decreases stress & increase length d) decrease stress & length
1 3757According to underground cables a) stress b/w sheath & conductor is high b) inrush of core & conductor
1929Post New Electrical Engineering Questions
I need to connect a synchronous generator to the grid using automatic synchronization and two circuit breakers (one for synchronization, one for end connection to the grid), how to determinate the required diameter of the cables?
What is rotary phase converter?
What is error of a measurement?
hi friend i am going too attend for hpcl in this month please help me by sending written test question papers i am in the stream of E.E.E
How to Calculate The Neutral Earth flat design calculation for the Synchronised generator (Gen 1-650Kva, Gen 2-725Kva
best manufacturer for busbar for outdoor switchyard having double bus bar scheme, can any one share technical specification of busbar. 132kv voltage ?
how to test and calculat the head and discharge in borewell compressor
size of condotory fron voltage level
What are the advantages of thermal power plant?
What is the difference between a verilog task and a verilog function?
what is the main difference between power devices and signal devices
can anyone provide me a amf panel control wiring using ec-2 relay?
what is the principle of the single phase energy meter? and,what is the advantages and disadvantages of single phase energy meter?
what is the relative size of single and three phase?
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.
