In a the rmal power plant,ash is Collected in. The av erage life of neutrons after they decay is. The Op erating time of instantaneous relay is. Stringi ng chart is useful for. The Sel f GMD method is used to evaluate.

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Its field current is switched off. The motor will come to stop. None of the above. A sine wave. A triangular wave. A pulse wave. The secondary output voltage will be 3. Ans: all options are correct Q. DC shunt motor. At full-load and 0. The resulting approximate variation in speed and armature current Ia will be Both and Ia are doubled.

When the motor is delivering rated output, the slip is found to be 0. The speed of the rotor m. If it is required to deliver rated current at rated voltage and 0. If the same machine is run as a motor it takes a line current of 20A from V supply. The speed of the machine as a motor will be rpm. The number of poles of the motor are 4. In a dc shunt motor the terminal voltage is halved while the torque is kept constant. The resulting approximate variation in speed and armature current Ia will be Both and Iaare doubled.

The current from the stator of an alternator is taken out to the external load circuit through slip rings. A motor which can conveniently be operated at lagging as well as leading power factors is the squirrel cage induction motor. The frequency of the rotor current in a 3 phase 50 Hz, 4 pole induction motor at full load speed is about 50 Hz. The size of a conductor used in power cables depends on the operating voltage. The most suitable servomotor for low power applications is a dc series motor.

A two-winding single phase transformer has a voltage regulation of 4. When a synchronous motor is running at synchronous speed, the damper winding produces damping torque. If a transformer primary is energised from a square wave voltage source, its output voltage will be A square wave. The two windings of a transformer is conductively linked. In a 3 phase induction motor the maximum torque is proportional to rotor resistance r2 does not depend on r2 is proportional to sqrt r2 is proportional to r2 2.

In a transformer the voltage regulation will be zero when it operates at unity p. A salient pole synchronous motor is running at no load. A stepper motor is a dc motor. In a stepper motor the angular displacement can be precisely controlled. The emf induced in the primary of a transformer is in phase with the flux.

The d. The relative speed between the magnetic fields of stator and rotor under steady state operation is zero for a dc machine. The power factor of a squirrel cage induction motor is low at light load only. A hysteresis motor is not a self-starting motor. Out of the following methods of heating the one which is independent of supply frequency is electric arc heating induction heating electric resistance heating dielectric heating.

A balanced three-phase, 50 Hz voltage is applied to a 3 phase, 4 pole, induction motor. An alternator is delivering rated current at rated voltage and 0. The generation voltage is usually between 11 KV and 33 KV. A ceiling fan uses split-phase motor. Learn more about Scribd Membership Home. Much more than documents. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Uploaded by kumarnani Document Information click to expand document information Description: ap genco.

Date uploaded Nov 28, Did you find this document useful? Is this content inappropriate? Report this Document. Description: ap genco. Flag for Inappropriate Content. Download Now. For Later. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. Pg In a 3 phase induction motor the maximum torque is proportional to rotor resistance r2 does not depend on r2 is proportional to sqrt r2 is proportional to r2 2 49 In a d. Out of the following methods of heating the one which is independent of supply frequency is electric arc heating induction heating electric resistance heating dielectric heating Sriram Chandu.

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