MCQ
Which of following can induce the maximum induced voltage?
- A1 amp dc.
- B1 amp 1 Hz.
- C1 amp 100 Hz.
- D20 amp dc.
✓
Answer
- 1 amp 100 Hz.
Explanation:
If we apply a high-frequency supply of the same peak voltage to the coil, the current still is being delayed by 90o but the time it requires to reach its maximum value has been reduced due to the increase in frequency. Because the frequency is inversely proportional to time (T). Hence, the rate of change of the flux within the coil has also increased due to the increase in frequency. Hence, the induced EMF is maximum in case of 1 amp 100 Hz supply source in the coil.
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 semiconductors at a room temperature
|
(a) The valence band is partially empty and the conduction band is partially filled |
|
(b) The valence band is completely filled and the conduction band is partially filled |
|
(c) The valence band is completely filled |
|
(d) The conduction band is completely empty |
Assertion : X-ray travel with the speed of light.
Reason : X-rays are electromagnetic rays.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The charges 1, 2, 3 are moving in uniform transverse magnetic field then:
Magnitude of magnetic field for a definite cross-section of a current carrying toroid is:
Consider the following two statements A and B, and identify the correct choice out of given answers
A. Thermo e.m.f. is minimum at neutral temperature of a thermocouple
B. When two junctions made of two different metallic wires are maintained at different temperatures, an electric current is generated in the circuit.
|
(a) A is false and B is true |
(b) A is true and B is false |
|
(c) Both A and B are false |
(d) Both A and B are true |
Consider the circuits shown in the figure. Both the circuits are taking same current from battery but current through R in the second circuit is 
th of current through R in the first circuit. If R is 11 W, the value of R1
|
(a) 9.9 W |
(b) 11 W |
(c) 8.8 W |
(d) 7.7 W |
Assertion : The air bubble shines in water.
Reason : Air bubble in water shines due to refraction of light
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
A body is in pure rotation. The linear speed $\nu$ of a particle, the distance r of the particle from the axis and the angular velocity $\omega$ of the body are related as $\omega=\frac{\text{v}}{\text{r}}$ Thus:
→-
$\omega\propto\frac{1}{\text{r}}$
-
$\omega\propto\text{r}$
-
$\omega=0$
-
$\omega$ is independent of r.
As the mass number A increases, the binding energy per nucleon in a nucleus:
- Increases.
- Decreases.
- Remains the same.
- Varies in a way that depends on the actual value of A.
Consider the following two statements regarding a linearly polarised, plane electromagnetic wave:
- The electric field and the magnetic field have equal average values.
- The electric energy and the magnetic energy have equal average values.
- Both A and B are true.
- A is false but B is true.
- B is false but A is true
- Both A and B are false.