The spring material used in a spring control device should have the following property.
1). Should be non-magnetic
2). Most be of low temperature co-efficient
3). Should have low specific resistance
4). All of the above
The essential requirements for an instrument springs are:
1) They should be non-magnetic
2) They should be proof from mechanical fatigue
3) Where springs are used to lead current into a moving system, they should have a small resistance, their cross-sectional area must be sufficient to carry the current without temperature rise affecting their constant.
4) They should also have a low resistance temperature coefficient
For most applications’ phosphor bronze has been found to be the most suitable material except in instruments low in resistance (like multi-voltmeters).1. The element that has the biggest size in a transistor is ___________
2. Which of the following circuit elements will oppose the change in circuit current?
3. A 0.47 µF capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is
4. A MOSFET uses the electric field of a ___________ to control the channel current
5. In a purely inductive circuit
6. In coal preparation plant, magnetic separators are used to remove
7. While calculating Rth in Thevenin’s theorem and Norton equivalent
8. For a given carrier wave, maximum undistorted power is transmitted when value of modulation is
9. The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?