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

86. What are the methods which the speed of an induction motor can be controlled?
87. State the advantages of star-delta starter over the direct on line starting.

UNIT - III Special Machines

88. What is the kind of single phase induction motor used in a wet grinder
89. What will be the reasons if a single phase induction motor fails to begin and hums loudly.
90. Name of methods of starting of single phase induction motor
91. Draw the circuit diagram of a capacitor begin induction run single phase induction motor
92. What is the kind of capacitor used in single phase induction motor
93. Define pull out torque
94. What will happen, if the starting winding of single phase IM is not disconnected during the normal running conditions of the motor
95. At what speed of the single phase induction motor, the starting winding is disconnected from the circuit of the main winding and how it is disconnected.
96. How will change the direction of rotation of single phase induction motor
97. What kind of single phase induction motor used in ceiling fan and washing machine.
98. Why are the single phase induction motor with main winding alone not self starting?
99. What is the function of centrifugal switch in the case of a single phase induction motor
101. What is an universal motor
102. Mention the applications of stepper motor
103. How would you reverse the direction of rotation of a capacitor begin and run induction motor
104. Name the different kind of single phase induction motors
105. Why the single phase induction motors are not self – starting
106. Why single phase capacitor kind induction motor are superior in performance.
107. State any 2 applications of universal motor
108. Where is stepper motor used
109. Give the typical value of capacitor used in a ceiling fan motor
110. Mention the applications of capacitor begin single phase induction motor
111. What are the advantages of AC servo motor.
112. How the direction of rotation of AC servo motor is reversed.
113. What is the difference ranging from DC and AC servo motor
114. How the number of steps per revolution can be increased in stepper motor
115. Mention the applications of stepper motor.
116. How the direction of rotation of stepper motor is reversed
117. State why small fractional kilowatt ac series motors are called universal motors.
118. Draw the complete speed torque characteristics of a single phase induction motor when mp auxiliary winding is given on the stator. Show how the torque speed characteristics are replaced when an auxiliary winding is provided.

Earning:   Approval pending.