A voltage V = V0 cos ωt is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?

Related Mcqs:

1. n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?

   IA. V = VR+VL+VC
   B. V2 = VR2+VL2+VC2
   C. V2 = VR2+(VL-VC)2
   D. V2 = VL2+(VR-VC)2

2. Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f ?

   A. 40 W
   B. 90W
   C. 100W
   D. 120W

3. An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45Ω. What is the inductance of the coil ?

   A. 10mH
   B. 12mH
   C. 16mH
   D. 20mH

4. pure resistor circuit the voltage and current are_______________?

   A. Lagging each other
   B. They are at 90? phase difference
   C. They have zero phase difference
   D. No phase difference

5. When a force is applied at one end of an elastic wire it produces at strain ∝ in the wire. If y is the youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by_________________?

   A. Y∝
   B. 2Y∝
   C. Y∝/2
   D. Y∝2

6. A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by_________________?

   A. Stress/strain
   B. (stress/strain)
   C. Stress x strain
   D. (Stress / strain)

7. The average power and instantaneous power become equal if work is done at __________________?

   A. any rate
   B. at variable rate
   C. at uniform rate
   D. at high rate

8. In full wave rectification the output D.C. voltage across the load is obtained for_____________?

   A. The positive half cycle of input A.C.
   B. The negative half cycle of input A.C.
   C. The complete cycle of input A.C.
   D. All of the above.

9. Average translational kinetic energy per molecule of an ideal gas is given by_____________?

   A. 3NaT/2R
   B. 2NaT/3
   C. 3RT/2Na
   D. 3Na/2RT

10. A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?

    A. 4 volt
    B. 5 volt
    C. 2 volt
    D. 0.4 volt