1. What are the different access specifiers for Java classes? Access classifiers are said to be the keywords that are used before a class name which refers the access scope in Java. public: field, method, class is accessible from anywhere. protected: field and method can be accessed from the same class to where they belong
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1. Define Encapsulation. Encapsulation : It is a mechanism that associates the code and the data it manipulates into a single unit. In C++, this is supported by a construct called class. 2. What is an expression? Give an example. Expression is a construct or operation created by combination of operators and operands. Example :
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1. What are the disadvantages of repulsion motor? Speed variations with the variations in load dangerously high at no load. Low power factor, except at high speeds. Requires frequent maintenance. Higher cost. Sparking at the brushes. 2. What are the applications of universal motor? Sewing machines High speed vacuum cleaners Electric typewriters Electric shavers Motion
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There are 12 behaviors or characteristics that successful quality leaders demonstrate. They give priority attention to external and internal customers and their needs. Leaders place themselves in the customers shoes and service their needs from that perspective. They continually evaluate the customers changing requirements. They empower, rather than control, subordinates. Leaders have trust and confidence
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1. What is the principle of an alternator? The alternator works on the principle on the Faraday’s law of electromagnetic induction. Whenever a conductor links with a magnetic field, either the conductor is moving, or the field is moving, an emf is induced in the conductor. 2. What are the different types of alternators? Which
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1. What are the advantages of three-phase induction motor? Simple construction High reliability Rugged construction High efficiency Low cost Less maintenance Self starting torque Good power factor. 2. What are the disadvantages of three phase induction motor? The speed is not constant with load. Reduction in efficiency when speed is varied. Low starting torque compared
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These galvanometers are of d’Arsonval type having a moving coil suspended between the pieces of a permanent magnet. When an alternating current is passed through the moving coil, an alternating deflecting torque is produced which makes the coil vibrate with a frequency equal to the frequency of the current passing. On account of inertia of
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It consists of a single loop of thin phosphorbronze strip which forms the moving system. It is called a vibrator loop. The vibrator loop is situated in the field of a permanent magnet but when high sensitivities are required, highly saturated electromagnets are used. The vibrator loop is formed by passing the strip over an
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1. Define a transformer. A transformer is a static device which change the alternating voltage form one level to another. 2. What is staggering in the construction of transformers? In transformer, the joints in the alternate layers are staggered in order to avoid the presence of narrow gaps right through the cross section of the
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1. What is an electric motor? Electric motor is a machine which converts electrical energy into mechanical energy. 2. Define DC motor. DC motor converts d.c electrical input into mechanical output. 3. What is the basic principle of operation of a dc motor? The basic principle of operation of a dc motor is that, a
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