1. For an Electromagnetic circuit field energy is equal to co-energy, true or false?
A- True
A- True
2. On which factors does the Electromagnetic Torque depend on an electromagnetic energy conversion device?
A- Stator field and the rotor field strength and the torque angle.
A- Stator field and the rotor field strength and the torque angle.
3. Why is the small air gap left between the stator and the rotor, in case of devices like generators and motors?
A- To permit the mechanical clearance.
A- To permit the mechanical clearance.
4. What is the condition of presence of Reluctance torque in rotating machines ?
A- The reluctance seen by the working MMF varies.
A- The reluctance seen by the working MMF varies.
5. A circular metallic disk is placed in a vertical magnetic field having constant induction which is in the downward direction. What will happen in the case of rotation of disc in horizontal plane ?
A- Its EMF will e zero.
A- Its EMF will e zero.
6. What is the type of the EMF induced in a conductor which is rotating in a bipolar field?
A- Alternating
A- Alternating
7. If a conductor is rotating in a magnetic field the positions at which the peak voltage will occur are?
A- Only along the axis of the magnetic field.
8. EMF which is induced in the coil rotating in a uniform magnetic field will have its maximum value in the case?
A- When the rate of change of flux linkage is maximum?
A- When the rate of change of flux linkage is maximum?
9. If a machine is having P number of poles then the relation between the electrical and mechanical degrees is given by?
A- Theta Electrical = P/2 Theta mechanical
A- Theta Electrical = P/2 Theta mechanical
10. In case of a DC motor on what quantity the Windage loss depends the most?
A- Square of the armature speed.
A- Square of the armature speed.
