1
MHT CET 2021 24th September Evening Shift
+1
-0

An alternating e.m.f. is $$\mathrm{e}=\mathrm{e}_0 \sin \omega \mathrm{t}$$. In what time the e.m.f. will have half its maximum value, if '$$\mathrm{e}$$' starts from zero? ($$\mathrm{T}=$$ time period, $$\sin 30^{\circ}=0.5$$)

A
$$\frac{\mathrm{T}}{12}$$
B
$$\mathrm{\frac{T}{16}}$$
C
$$\frac{\mathrm{T}}{4}$$
D
$$\mathrm{\frac{T}{8}}$$
2
MHT CET 2021 24th September Morning Shift
+1
-0

A step up transformer operates on $$220 \mathrm{~V}$$ and supplies current of $$2 \mathrm{~A}$$. The ratio of primary and secondary windings is $$1: 20$$. The current in the primary is

A
5 A
B
2 A
C
40 A
D
20 A
3
MHT CET 2021 24th September Morning Shift
+1
-0

In the part of an a.c. circuit as shown, the resistance $$R=0.2 \Omega$$. At a certain instant $$(\mathrm{V_A-V_B})= 0.5 \mathrm{~V}, \mathrm{I}=0.5 \mathrm{~A}$$ and $$\frac{\Delta \mathrm{I}}{\Delta \mathrm{t}}=8 \mathrm{~A} / \mathrm{s}$$. The inductance of the coil is

A
0.04 H
B
0.02 H
C
0.08 H
D
0.05 H
4
MHT CET 2021 24th September Morning Shift
+1
-0

In the circuit shown in the figure, a.c. source gives voltage $$\mathrm{V}=20 \cos (2000 \mathrm{t})$$. Impedance and r.m.s. current respectively will be

A
$$10 \Omega, 0.5 \mathrm{~A}$$
B
$$5 \Omega, 2 \mathrm{~A}$$
C
$$10 \Omega, \sqrt{2} \mathrm{~A}$$
D
$$5 \Omega, 1 \mathrm{~A}$$
EXAM MAP
Medical
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