MCQ
When the current through the electromagnet of a relay reaches a particular value:
- AIt breaks the circuit.
- BIt open the circuit by pulling in an iron contact.
- CIt closes the circuit by pulling in an iron contact.
- ✓Both $A$ or $C.$
✓
Answer
Correct option: D.
Both $A$ or $C.$
They are ways of switching using a low current to use an electromagnet to close or open a spring steel contact.They are often used to isolate a user from a high voltage that needs to be switched, using low current, low voltage to operate the relay, rather than having a user come in direct proximity to the higher voltage that needs to be switched.When the current through the electromagnet of a relay reaches a particular value it either breaks the circuit by repllening or closes the circuit by pulling in an iron contact.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In Young's double slit experiment using sodium light (λ = 5898 Å), 92 fringes are seen. If given colour (λ = 5461 Å) is used, how many fringes will be seen
When two identical capacitors are in series have 3mF capacitance and when parallel 12mF. What is the capacitance of each
A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just $10 \%$ of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser need to be rotated further to reduce the output intensity to be zero, is.....$^o$
→Complete the reaction $\mathrm{n}+{ }_{92}^{235} \mathrm{U} \rightarrow{ }_{56}^{144} \mathrm{Ba}+\cdots+3 \mathrm{n}$
→The refractive index of a prism for a monochromatic wave is $\sqrt 2 $ and its refracting angle is $60^o $. For minimum deviation, the angle of incidence will be......$^o$
→In the given reaction $\mathrm{z}^{\mathrm{X}^{\mathrm{A}}} \rightarrow \mathrm{z}+1^{\mathrm{Y}^{\mathrm{A}}} \rightarrow \mathrm{z}-1^{\mathrm{K}^{\mathrm{A}-4}} \rightarrow \mathrm{z}-1^{\mathrm{K}^{\mathrm{A}-4}}$ Radioactive radiations are emitted in the sequence
→Four combinations of two thin lenses are given in List-$I$. The radius of curvature of all curved surface is r and the refractive index of all lenses is $1.5.$ Match lens combinations in List-$I$ with their focal length in List-$II$ and select the correct answer using the code given below the lists.
→A 100 ohm galvanometer gives full scale deflection at 10 mA. How much shunt is required to read 100 mA
A short magnet is allowed to fall along the axis of a horizontal metallic ring. Starting from rest, the distance fallen by the magnet in one second may be.....$m$
→Which of the following shown particle nature of light