Electrical Machines-I
Previous year question paper with solutions for Electrical Machines-I
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- Frictional torque always acts in opposite direction to the …………………………
- In motoring action, armature rotates in the same direction as that of ……………...
- In Fleming`s left hand rule , thumb generally represents …………………..
- The two types of windings used in DC machines are…………. & ………….
- ……………… motor has high starting torque .
- Yoke of a DC machine is made of …………..
- Swinburne’s test is used to find the …………… in a DC machine .
- Tap changers are provided on the ………………. winding of transformer.
- Power transformers are designed for low ……….. losses .
- To determine the copper losses in the transformer ………….. test is performed .
- The magnitude of induced ___ is directly proportional to rate of change of___.
- Under ____ condition magnets do not move away from each other.
- Direction of torque depends upon _____ of torque angle.
- D.C series motor is used for________.
- Interpoles are used for __________.
- D.C motor starter is used for ________ starting current.
- Transformer is a _________ machine
- Transformer core is made of silicon steel to reduce _____.
- Condition for maximum efficiency is copper losses is equal to ______.
- Transformer steps up or steps down _________.