Power Systems What will be the thermal efficiency of a 240 V, 1000 W electric kettle if it brings 2 liters of water at 15° C to boiling point 15 Minutes 80.25 %. 78.96 %. 79.33 %. 74.56 %. 80.25 %. 78.96 %. 79.33 %. 74.56 %. ANSWER DOWNLOAD EXAMIANS APP
Power Systems A 50 Hz, 17.32 kV generator is connected to a power system. The system reactance and capacitance per phase are 10 mH and 0.2 mF respectively. What is the maximum voltage across the contacts of the circuit breaker at an instant when it passes through zero? 29.28 kV 28.28 kV 30.28 kV 31.28 kV 29.28 kV 28.28 kV 30.28 kV 31.28 kV ANSWER DOWNLOAD EXAMIANS APP
Power Systems Skin effect depends on frequency relative permeability conductivity All of these frequency relative permeability conductivity All of these ANSWER DOWNLOAD EXAMIANS APP
Power Systems Consider a long, two wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and distance between their centers is 100 cm. If this distance is doubled, then the inductance per unit length. Increase but does not doubled. Doubled. Decrease but does not halves. Halves. Increase but does not doubled. Doubled. Decrease but does not halves. Halves. ANSWER DOWNLOAD EXAMIANS APP
Power Systems Counter poise is used for proper discharging of lighting surges reduce losses more surge impedance less surge impedance proper discharging of lighting surges reduce losses more surge impedance less surge impedance ANSWER DOWNLOAD EXAMIANS APP
Power Systems The conductor carries more current on surface as compared to core. This is called as skin effect All of these corona effect unsymmetrical fault skin effect All of these corona effect unsymmetrical fault ANSWER DOWNLOAD EXAMIANS APP
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