All the peripheral devices connected to a computer require power to work. Which of the following voltages is required for the motherboard to work? Positive cycle of sine wave AC Negative cycle of sine wave DC TRUE ANSWER : ? YOUR ANSWER : ?
The purpose of providing a choke in a tube light is To eliminate corona effect To limit the current to an appropriate value To avoid radio interference To improve the power factor TRUE ANSWER : ? YOUR ANSWER : ?
In a series RLC circuit at resonance Current is minimum and power factor is unity Current is maximum and power factor is unity Current is maximum and power factor is 0.5 Current is minimum and power factor is 0.5 TRUE ANSWER : ? YOUR ANSWER : ?
In carrier current protection, the purpose of the wave trap is for Trapping power frequency waves Trapping high frequency waves entering into generator/transformer unit. All of these Tripping fault current TRUE ANSWER : ? YOUR ANSWER : ?
The efficiency of a transformer at full load, 0.8 p.f. lag is 90%. Its efficiency at full load, 0.8 p.f. lead will be More than 90% 80 % 90 % Less than 90% TRUE ANSWER : ? YOUR ANSWER : ?
Ybus used in power flow studies and Zbus used in short circuit studies Are inverse of each other Have no inter relation Are transpose of each other Are the same TRUE ANSWER : ? YOUR ANSWER : ?
The mutual inductance between two unity coupled coils of 9 H and 4 H is 13 H 36 H 2.2 H 6 H TRUE ANSWER : ? YOUR ANSWER : ?
Permittivity is expressed in terms of Farad/m farad/sq. m. Weber /m N/m TRUE ANSWER : ? YOUR ANSWER : ?
The circuit breaker generally used in railway traction is Minimum Oil CB Air break CB Vacuum CB Bulk Oil CB TRUE ANSWER : ? YOUR ANSWER : ?
The positive and negative sequence impedance of a transmission line are Different Zero Infinite Equal TRUE ANSWER : ? YOUR ANSWER : ?