Question & Answers

1. List three features of MySQL? MySQL is easy and reliable for use. MySQL supports various programming languages like PHP, Java, Perl, and C++. MySQL supports standard SQL that means (Structured Query Language). These types of MySQL Interview Questions for fresher in an Interview. 2. What is the Language MySQL is been written with? MySQL

1. What is the name of the Script Engine in PHP? Zend Engine 2 2. What are the uses of count() function in PHP? This function is used in counting all the elements in the array. 3. How can we include the file to the PHP page? We could include the file to the PHP

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

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 :

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

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

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

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

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

1. What is an electrical generator? An electrical generator is a machine which converts mechanical energy to electrical energy. 2. What is the basic principle of a dc generator? Basic principle of a dc generator is Faraday’s law of electromagnetic induction. whenever a conductor is moved in a magnetic field, dynamically induced emf is produced