⚡ELECTRICAL STUDY⚡

When a unit impulse voltage is applied to an inductor of 4 H, energy supplied by the source is:

In a particular circuit, a coil having a self- inductance of 2 H is required to carry a current of 4 A. A capacitor rated for 400 V is used across the coil in order to prevent sparking during breaking of the circuit. The value of capacitor needed is:

Which of the following is not used as a overhead conductor

Which one of the following A.C.SR conductors is having lowest cross sectional area?

According to I.E. Rules the minimum ground clearance of the lowest conductor of low and medium voltage O.H. lines running across the street must be maintained at

For a 400 kV line the spacing between phase conductors is around :

If d is the diameter of an overhead transmission line conductor and t is the thickness of the ice covered over it then, the overall diameter of the ice-covered conductor becomes:

Which one of the following is reduced by using stock bridge dampers on power overhead transmission lines?

Which of the following system is an example of closed loop control system?

Consider the following power semiconductor devices: 1. TRIAC 2. MOSFET 3. Power Transistor 4. Insulated Gate Bipolar Transistor (IGBT) Out of these devices, voltage-controlled devices are

In a 3 wire distribution system, the voltage between the two external wires is 100 V DC. What will be the voltage between an outer wire and the middle (neutral) wire?

Which of the following conditions are necessary to connect an alternator into the bus-bar grid. 1. Same terminal voltage. 2. Same prime mover speed. 3. Same phase sequence. 4. Same frequency.

When the area of the parallel plate capacitor increases by 7 times and separation between both plates decreases by 7 times, then the capacitance of the parallel plate capacitor becomes

The main reason for generation of harmonics in a transformer could be

Arcing horns are used for

If the voltage across the units in a two unit suspension insulator is 60% and 40% respectively of the line voltage, the ratio of capacitance of the insulator to that of its capacitance to earth will be

The insulators used in guy cables are_______

ACSR is used in place of copper in overhead lines because of ________

Transducer using Hall effect converts_________

The criterion for selection of the size of conductor for a feeder is