There are three types of characteristics. Open circuit characteristics (OCC) or magnetisation cháracteristics (E2 versus If). Internal characteristics or total characteristics (E versus Ia). External characteristics or voltage...
DC generators can be classified according to their methods of field excitation. There are two types of DC generators on the basis of excitation. Separately excited DC generators Self excited DC generators Separately excited DC...
DC Generator : An electrical generator is a rotating machine which converts mechanical energy into electrical energy. It is shown in figure. This energy conversion is based on the principle of electromagnetic induction. According...
Like a four wheel vehicle, a two wheel vehicle will also be subjected to gyroscopic and centrifugal couple when it takes a turn on a curved path. Let us consider a two wheel vehicle, (say, a scooter or a motor bicycle) taking a...
Consider any four wheel automobile (say, car) having wheels A, B, C and D, taking a turn towards left on a curved path, as shown in Fig (a). The wheels A and C are inner wheels, whereas B and D are outer wheels. While the vehicle...
Before discussing the gyroscopic effect on naval ships, first let us brief the terminology used in connection with the naval ship. Ship Terminology The front, top, and side views of a naval ship are shown in fig (a), (b) and (c)...
We already know that the angular acceleration is the rate of change of angular velocity. It is a vector quantity and can be represented both in magnitude and direction with the help of right hand screw rule. A body rotating in a...
The spring controlled governor of the Wilson Hartnell type is shown in Fig. In this governor, the bell crank levers are pivoted at the ends of two arms which rotate with the spindle. The vertical arms of the bell crank lever...
Figure shows a simplified overview of the database design process. The first step shown is requirements collection and analysis. During this step, the database designers interview prospective database users to understand and...
In this section, we give an overview of the schema evolution commands available in SQL, which can be used to alter a schema by adding or dropping tables, attributes, constraints, and other schema elements. This can be done while...
