The positive and negative sequence impedance of a transmission line are Different Zero Infinite Equal TRUE ANSWER : ? YOUR ANSWER : ?
Which type of back up protection is widely used for the protection of transmission lines? Relay backup Breaker backup Control backup Remote backup TRUE ANSWER : ? YOUR ANSWER : ?
At time t= 0+ , with zero initial condition, which of the following acts as a short circuit? Voltage source Conductor Resistor Capacitor TRUE ANSWER : ? YOUR ANSWER : ?
In which of the following motors, the stator and rotor magnetic fields rotate at the same speed? Induction motor Synchronous motor Reluctance motor Universal motor TRUE ANSWER : ? YOUR ANSWER : ?
Due to skin effect Uniform current flows through the conductor Current flows through the half cross section of the conductor Portion of the conductor near the surface carries more current and the core of the conductor carries less current Portion of the conductor near the surface carries less current and the core of the conductor carries more current TRUE ANSWER : ? YOUR ANSWER : ?
First zone distance relay protects the transmission line section upto 25 % of its full length 50 % of its full length 80 % of its full length Its full length TRUE ANSWER : ? YOUR ANSWER : ?
A Mho relay is a Voltage controlled over current relay Voltage restrained directional relay Directional restrained over current relay Directional restrained over voltage relay TRUE ANSWER : ? YOUR ANSWER : ?
The insulation coordination for UHV lines (above 500 kV) is done based on Voltage level of the line Switching surges Lightning surges Lightning and switching surges TRUE ANSWER : ? YOUR ANSWER : ?
The purpose of providing a choke in a tube light is To improve the power factor To limit the current to an appropriate value To eliminate corona effect To avoid radio interference TRUE ANSWER : ? YOUR ANSWER : ?
It is difficult interrupt a capacitive current because Stored energy in the capacitor is very high The restriking voltage can be high Current magnitude is very small It has a leading power factor TRUE ANSWER : ? YOUR ANSWER : ?