MHT CET 2021 21th September Evening Shift | Alternating Current Question 65 | Physics

The inductive reactance of a coil is R$$\Omega$$. If the inductance of a coil is doubled and frequency of a.c. supply is also doubled then the new inductive reactance will be

$$\mathrm{\frac{R}{2}}$$

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

Three pure inductors each of inductance 6H are connected as shown in the figure. Their equivalent inductance between the points 'P' and 'Q' is

MHT CET 2021 21th September Evening Shift Physics - Alternating Current Question 71 English

0.5 H

18 H

6.3 H

2 H

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

The instantaneous value of an alternating current is given by $$\mathrm{i}=50 \sin (100 \pi \mathrm{t})$$. It will achieve a value of $$25 \mathrm{~A}$$ after a time interval of $$\left(\sin 30^{\circ}=0.5\right)$$

$$\frac{1}{300} \mathrm{~S}$$

$$\frac{1}{100} \mathrm{~S}$$

$$\frac{1}{200} \mathrm{~S}$$

$$\frac{1}{600} \mathrm{~S}$$

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

In a step up transformer, which one of the following statements is correct?

Number of turns in the secondary coil is less than in primary coil.

Voltage in secondary coil is less than voltage is primary coil.

Current in the primary coil is more than current in the secondary coil.

Current in the primary coil is equal to current in the secondary coil.

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