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
- DBoth A or C
✓
Answer
- Both A or C
Explanation:
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
Which of the following equations represents a wave travelling along Y-axis?
→-
$\text{x}=\text{A}\sin(\text{ky}-\omega\text{t})$
-
$\text{y}=\text{A}\sin(\text{kx}-\omega\text{t})$
-
$\text{y}=\text{A}\sin\text{ky}\cos\ \omega\text{t}$
-
$\text{y}=\text{A}\cos\text{ky}\sin\ \omega\text{t}.$
Tritium is an isotope of hydrogen whose nucleus Triton contains 2 neutrons and 1 proton. Free neutrons decay into $\text{p}+\overline{\text{e}}+\overline{\text{v}}$. If one of the neutrons in Triton decays, it would transform into He3 nucleus. This does not happen. This is because:
→An electric dipole is situated in an electric field of uniform intensity E whose dipole moment is p and moment of inertia is I. If the dipole is displaced slightly from the equilibrium position, then the angular frequency of its oscillations is
|
(a) |
(b) |
(c) |
(d) |
This symbol represents
|
(a) NOT gate |
(b) OR gate |
(c) AND gate |
(d) NOR gate |
If an electron moves from rest from a point at which potential is 50 volt to another point at which potential is 70 volt, then its kinetic energy in the final state will be
|
(a) 3.2 × 10–10 J |
(b) 3.2 × 10–18 J |
(c) 1 N |
(d) 1 dyne |
A mechanical wave propagates in a medium along the X-axis. The particles of the medium.
- Must move on the X-axis
- Must move on the Y-axis
- May move on the X-axis
- May move on the Y-axis.
The rays parallel and close to the principal axis are called:
The nature of electron beams moving with uniform velocity in the same direction will be :
In the circuit shown below, the power developed in the 6W resistor is 6 watt. The power in watts developed in the 4W resistor is
|
(a) 16 |
(b) 9 |
(c) 6 |
(d) 4 |
The ________ drawn at any point on the magnetic lines of force gives direction of magnetic field at that point.