11. Electromagnet is constructed with which of the following ?
12. When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes?
13. Fleming's right hand rule is used to find the direction of the
14. A current carrying conductor is associated with
15. In order to make an electromagnet you need a
16. Which of the following is not a part of a CRT ?
17. Slip rings are usually made of
18. The safest hammers are those with heads that are
19. The function of ball bearings in a wheel is :
20. Gear finishing operation is called
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