SRM University 2007 B.Tech Electronics and Communications Engineering BANK - Question Paper

119. Mention the conditions necessary for production of a rotating magnetic field with the help of stationary winding.
120. Mention the kinds of universal motor
121. How the direction of rotation of universal motor is reversed.
122. What is the need of compensating winding in universal motor
123. Mention the application of universal motor
124. What could be the reasons if a split phases induction motor runs too slow?
125. Mention the difference ranging from non compensated and compensated kind of universal motors.
126. What are the methods followed to control the speed of universal motor.
127. Draw the circuit diagram of capacitor begin and run induction motor and also draw its vector diagram.
128. What is the difference ranging from split single phase and capacitor begin and run single phase induction motors

UNIT - IV Synchronous motor and Alternator

129. Name any 2 important parts of an alternator, indicating the materials used for them.
130. Define regulation of an alternator.
131. Name the 2 kinds of windings employed in an alternator.
132. Which kind of synchronous generator is suitable for hydel power station?
133. What is the effect of armature reaction, when the load power factor is unity?
134. Why does the terminal voltage of an alternator reduce with increasing load?
135. Name the different kinds of alternators.
136. What is meant by armature reaction?
137. Why are the poles and pole-shoes laminated?
138. Write the EMF formula of a three-phase alternator.
139. Define synchronous Reactance.
140. Define distribution factor of 3 phase winding of an alternator.
141. Why is hydrogen used as a cooling medium in turbo alternator?
142. Why are salient pole alternators more suitable for low speed operation?
143. Name the 2 kinds of alternators depending on the rotor construction
144. What is meant by pitch factor?
145. What is an exciter?
146. State the relation ranging from frequency, number of poles and speed?
147. What is the necessity of computing the voltage regulation of alternators?
148. What is meant by the term “Predetermination”?
149. Explain why alternators are rated in KVA?
150. State whether the output of the alternator can be varied by varying the field current.
151. What is meant by synchronizing of alternators?
152. Why are alternators put in parallel?
153. What is synchronizing torque?
154. Define Load angle.
155. What is meant by synchronizing power?
156. What are the conditions to be satisfied before paralleling an alternator?

Earning:   Approval pending.