i) Secular variation and irregular variation. ii) Isogonic lines and agonic lines.
Explanation
Secular and irregular variations are important to consider when taking magnetic bearings. Isogonic and agonic lines are used to determine the magnetic declination and to ensure that the bearings are accurate.
⬆ Related Topic
📘 Syllabus
View KERALA UNIVERSITY Class 3 Syllabus →
📝 Practice Questions
Practice Previous Year Questions →
🤖 Practice with AI
Generate Practice Question Paper →
📚 Related Concepts
- (a) Explain the principle and working of (i) Zener diode (ii) LED
- (i) Ruling gradient (ii) Pusher gradient (iii) Momentum gradient (iv) Grade compensation on curves
- (c) Explain the terms; (i) latent heat and (ii) sensible heat.
- (c) Explain the terms; (i) latent heat and (ii) sensible heat.
- (i) mass of carbon per Kg of dry flue gas and (ii) A/F ratio.