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Alternating Current

JEE Main 2024 (Online) 29th January Evening ShiftMCQEasy📈 Topic in 17% papers+4−1
Ques. 1JEE Main 2024, 29 January (Evening Shift)

In an a.c. circuit, voltage and current are given by: V=100 (100t) V and I=100 (100t+ 3 )mA respectively. The average power dissipated in one cycle is:

  1. 5 W
  2. 25 W
  3. 2.5 W
  4. 10 W

Answer

(3) 2.5 W

Solution

Pavg=VrmsIrms = V0I02

= 100 (100 10-3)2 3

=5 12=2.5 W

Phase difference between V and I is = 3; I0=100 mA=0.1 A.

Answer: (3)

Keep practising — Alternating Current

Ques. 2JEE Main 2024, 27 January (Evening Shift)

Primary side of a transformer is connected to 230 V, 50 Hz supply. Turns ratio of primary to secondary winding is 10:1. Load resistance connected to secondary side is 46 . The power consumed in it is :

  1. 11.5 W
  2. 12.5 W
  3. 10.0 W
  4. 12.0 W
Ques. 3JEE Main 2024, 27 January (Evening Shift)

A series LCR circuit with L= 100 mH, C= 10-3 F and R=10 , is connected across an ac source of 220 V, 50 Hz supply. The power factor of the circuit would be .

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