SATHEE: Electro Magnetic Induction And Alternating Currents Question 139

Electro Magnetic Induction And Alternating Currents Question 139

Question: The voltage of an ac supply varies with time $(t)$ as $V = 120 \sin 100 π t \cos 100 π t .$ The maximum voltage and frequency respectively are [MP PMT 2001; MP PET 2002]

Options:

A) 120 volts, 100 Hz

B) $\frac{120}{\sqrt{2}}$ volts, 100 Hz

C) 60 volts, 200 Hz

D) 60 volts, 100 Hz

Show Answer

Answer:

Correct Answer: D

Solution:

$V = 120 \sin 100 π t \cos 100 π t$

$\Rightarrow V = 60 \sin 200 π t$

$V_{max} = 60 V$ and $ν = 100 H z$

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Electro Magnetic Induction And Alternating Currents Question 139

Question: The voltage of an ac supply varies with time (t) as V=120sin⁡100πtcos⁡100πt. The maximum voltage and frequency respectively are [MP PMT 2001; MP PET 2002]

Options:

Answer:

Solution:

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Question: The voltage of an ac supply varies with time $(t)$ as $V = 120 \sin 100 π t \cos 100 π t .$ The maximum voltage and frequency respectively are [MP PMT 2001; MP PET 2002]