Which of the following statement regarding the determination of the value of resistance R in the circuit below is true?
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Solution
Given
To Find True statements.
Solution Correct option is(d).
A 50 A, 230 V,unity power factor meter on full load test makes 61 revolutions in 37 seconds. If the nominal disc speed is 520 revolutions per kWh, the percentage error is___________.
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Solution
Given Disc normal speed = 520 rev/kWh
V = 230 V
I= 50 A
Power factor = unity = 1
Full load test makes 61 revolution for 37 s.
To find Percentage error.
Soluton Actual energy consumed for 1 hours
P = VI cos φ= 230 × 50 × 1
Characteristic equation of a certain system is s3 + s2 + 4s+ 10 = 0. The natural frequency of the system is
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In the circuit shown in figure, the circuit turn off time for main and auxiliary SCR’s in microseconds are respectively
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Average RRRV ofa 132 kV circuit breaker is 10 kV/μs at a fault power factor of 0.8 lag. What is average RRRV at fault power factor of 0.6 lag by keeping all other condition remains same
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For a 3-core, 3-φ cable, charging current per phase is 90 A with an operating voltage of 33 kV. If power factor of cable dielectric material is 0.02, then what is total dielectric loss in cable?
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Solution
Time constant tin the circuit given below in second is__________.
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Solution
A 50 Hz bar primary eT has a secondary with 500 turns.The secondary supplies 5 A current into a purely resistive burden of 1Ω. The magnetising ampere-turns is 200. The phase angle between the primary and secondary current in degree is ______________.
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For an unbalanced fault at a location, the sequence currents are given by I+= – j 1.653 pu, I–= j 0.5 pu,I0= j 1.153 pu, positive sequence voltage = 0.175 pu. What is the type of fault and short circuit MVA at fault location for a balanced fault, if pre-fault voltage is 1 pu(Base 100 MVA, 132 kV)?
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Solution
For the diode circuit shown in figure, the minimum and maximum values of the output waveform is
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