Catalog of Electrical Engineering questions with useful answers that help you develop a clear insight of your conceptual problems.
List of topics:
The horizontal distance between consecutive supports of overhead transmission lines is technically termed as span of overhead transmission lines. In figure below span is indicated using black two headed arrow.
Overhead transmission line conductors are often stranded, meaning they consist of multiple smaller wires twisted or braided together, for several reasons. Although there are many reasons, but the major reason is flexibility and greater mechanical strength. Stranding increases the flexibility of the conductor, making it easier to handle during installation and allowing it to better … Read more
Maximum power transfer capability of transmission line can be increased by using: Correct answer: 4. All of these Explanation:
In order to determine armature copper losses of alternator short circuit the armature of alternator and drive it at synchronous speed with enough excitation to cause full-load current to circulate. At this point, note the power required. Now, open circuit the armature and measure iron and friction losses as mentioned below: Iron and friction losses … Read more
Iron and friction losses of alternator are measured by coupling alternator to suitably calibrated DC Motor and driving the motor at synchronous speed with normal excitation. The iron and friction losses equal the output of motor in watts.
No, generally we can’t determine efficiency of alternator by direct loading, that is because of owing to difficulty in finding suitable load. Rather of direct loading efficiency is determined from losses. Efficiency is the defined as the ratio of electrical power output of the alternator to the mechanical power put into it and is usually … Read more
A salient or project pole type alternator is the one in which projecting poles are mounted on the circular steel frame that is fixed on shaft of alternator. The EMF generated in a conductor at any instant is mathematically given by: e = Blv volts Where in above equation: EMF generated is directly proportional to … Read more
A salient or project pole type alternator is the one in which projecting poles are mounted on the circular steel frame that is fixed on shaft of alternator. The EMF generated in a conductor at any instant is mathematically given by: e = Blv volts Where in above equation: EMF generated is directly proportional to … Read more
Alternators are rated in kilovolt-amperes (kVA) because their rating needs to encompass both real power (kW) and reactive power (kVAR). The rating in kVA provides a measure of the overall power-carrying capacity of the alternator, considering both the active (real) power and the reactive power components in an AC electrical system. Explanation: When a load … Read more
The damper winding in an alternator reduces the hunting in alternators operating in parallel. The basic construction of damper winding involves short-circuited copper bars that are embedded in the pole-faces of the salient-pole rotor. Whenever hunting occurs, there is a shifting of the armature flux across the polefaces, thereby inducing currents in the damper winding. … Read more