In a short circuit test on a circuit breaker, the following readings were obtained on single frequency transient : Time to reach the peak restriking voltage = 50 µ sec Peak restriking voltage = 100 kV The average RRRV is (1) 2 × 10° kV/sec (ii) 4 × 10 kV/sec (iii) 5.6 x 106 kV/sec (iv) none of above

In a short circuit test on a circuit breaker, the following readings were obtained on single frequency transient : Time to reach the peak restriking voltage = 50 µ sec Peak restriking voltage = 100 kV The average RRRV is (1) 2 × 10° kV/sec (ii) 4 × 10 kV/sec (iii) 5.6 x 106 kV/sec (iv) none of above

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter3: Magnetic Starters

Section: Chapter Questions

Problem 30SQ

See similar textbooks

Similar questions

A 240V, 50Hz supply feeds a highly inductive load resistance through a thyristor bridge that is: 1) half-controlled 2) fully-controlled Calculate load current, power and power factor for each case when the firing angle delay = 45 degrees
A 240V, 50Hz supply feeds a highly inductive load of 500Ω resistance through a thyristor bridge that is half-controlled. Calculate load rms current and power factor when the firing angle delay α = 45°.
What is the thermal noise for components operating at the following parameters. T=-50 degrees, C, B=50kHz and R= 50 ohms.
An alternating current varying sinusoidally with a frequency of 50 Hz has anrms value of 20 A.a) Determine the instantaneous value at 0.0025 seconds.b) Determine the instantaneous value, 0.0125 seconds after passingthrough a positive maximum value.c) At what time, measured from a positive maximum value, will theinstantaneous current be 14.14 A?
A series circuit consisting of 9 ohm and 50.809mH inductance is connected across 220 volts 60Hz supply. Calculate the magnitude of the total impedance of the circuit
A 3V sinusoidal signal with frequency 100 Hz amplitude is applied to channel A of an oscilloscope. A sinusoidal signal with the same frequency but opposite phase and amplitude of 1.5V is applied to channel B. What will be the equation of the Lissajous curve when the oscilloscope is switched to XY mode while the channels are at the same Volt/div setting?
Calculate the value of VCC. at VE=3V, RE=304 ohm, IB=11uA, RC=2685ohm and VCE=8V
A relay has 12 ohms resistance, and a 2.4 H inductance is suddenly switched across 120 volts supply of negligible internal resistance. Determine the instantaneous current after 0.1 second.Ans 3.9
A 70-Vac source has the following waveform.Determine:a. the instantaneous voltage when t = 120 msb. the angle (1st occurrence) after t = 0 when the voltage is +80 Vc. the time (2nd occurrence) after t = 0 when the voltage is –10 V
FILL IN THE BLANKS: Q3119: In Physical layer, Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.
Calculate the average current (A)
A 3 phase 50 Hz alternator is connected to the bus bars through an oil circuitbreaker. Due to short circuit occurring at bus bars, the circuit breaker opens when the r.m.s value of the current was 8000 amperes. The reactance of each phase of the alternator is 2.5 mH and the capacitance to earth between the circuit breaker and the alternator is 1.4 x 10^-7 uF. Determine: (i) Frequency of oscillations(ii) The maximum value of RRRV(iii) Time taken to achieve RRRV value in (ii)