MHT CET 2021 21th September Evening Shift | Alternating Current Question 67 | Physics

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.

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

-0

In the graphical representation of e.m.f. '$$\mathrm{e}$$' and current '$$\mathrm{i}$$' versus '$$\omega \mathrm{t}$$' for an a.c. circuit, both emf and current reach zero, minimum and maximum value at the same time. The circuit element connected to the source will be

pure capacitor

combination of capacitor and inductor

pure resistor

pure inductor

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

-0

An alternating voltge is represented by $$\mathrm{V}=80 \sin (100 \pi \mathrm{t}) \cos (100 \pi \mathrm{t})$$ volt. The peak voltage is

$$20 \mathrm{~V}$$

$$40 \mathrm{~V}$$

$$30 \mathrm{~V}$$

$$50 \mathrm{~V}$$

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