MCQ
The capacitive reactance in an AC circuit is.
  • A
    effective resistance due to capacity
  • B
    effective wattage
  • C
    effective voltage
  • D
    None of these

Answer

  1. effective resistance due to capacity

Explanation:

Capacitive reactance in an A.C circuit is: $\text{X}_\text{C}=\frac{1}{\omega\text{C}}\text{ohm}$

where, C is the capacitance of capacitor and $\omega=2\pi\text{rn}$ (n is the frequency of A.C source)

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

When an electron jumps from its orbit to another orbit, energy is:

When two magnetic moments are compared using equal distance method the deflections produced are 45o and 30o. If the length of magnets are in the ratio 1 : 2, the ratio of their pole strengths is

(a) 3 : 1   

(b) 3 : 2

(c)  

(d) 2 

The half-life of radon is 3.8 days. Three forth of a radon sample decay in

(a) 5.02 days

(b) 15.2 days

(c) 7.6 days

(d) 11.4 days

The Lyman transitions involve:

The field due to a long straight wire carrying a current I is proportional to

(a) I  

(b)  

(c)        

(d) 1/I

The weight of an empty balloon on a spring balance is W1. The weight becomes W2 when the balloon is filled with air. Let the weight of the Air itself be $\omega$ neglect the thickness of the balloon when it is filled with air. Also neglect the difference in the densities of air inside and outside the balloon.

  1. $\text{W}_2=\text{W}_1$

  2. $\text{W}_2=\text{W}_1+\omega$

  3. $\text{W}_2<\text{W}_1+\omega$

  4. $\text{W}_2>\text{W}_1$

According to Joule's law, if the potential difference across a conductor having a material of specific resistance remains constant, then the heat produced in the conductor is directly proportional to

(a) ρ

(b)  

(c)  

(d)  

The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to keep the plate current constant its plate voltage is to be increased by

(a) 10 volt

(b) 4 volt

(c) 40 volt

(d) 100 volt

125 identical drops each charged to the same potential of 50 volts are combined to form a single drop. The potential of the new drop will be

(a) 50 V   

(b) 250 V

(c) 500 V

(d) 1250 V

Which of the following radiations has the least wavelength

(a) X-rays 

(b) g-rays

(c) b -rays

(d) a-rays