Inductance affects the direct current flow__________?

Related Mcqs:

1. In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value__________?

   A. will change the maximum value of current at resonance
   B. will change the resonance frequency
   C. will change the impedance at resonance frequency
   D. will increase the selectivity of the circuit

2. Inductance of a coil Varies__________?

   A. directly as the cross-sectional area of magnetic core
   B. directly as square of number of turns
   C. directly as the permeability of the core
   D. inversely as the length of the iron path
   E. as A. to (d)

3. An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

   A. the current through the resistance is more
   B. the current through the resistance is less
   C. both resistance and inductance carry equal currents
   D. none of the above

4. The inductance of a coil can be increased by_________?

   A. increasing core length
   B. decreasing the number of turns
   C. decreasing the diameter of the former
   D. choosing core material having high relative permeability

5. A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?

   A. the big size of the inductor
   B. the reactance of the inductor
   C. the current flowing in the inductor
   D. the statement given is false

6. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?

   A. 0.001 s
   B. 0.1 s
   C. 10 s
   D. 100 s

7. Inductance of coil___________?

   A. is unaffected by the supply frequency
   B. decreases with the increase in supply frequency
   C. increases with the increase in supply frequency
   D. becomes zero with the increase in supply frequency

8. The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces__________?

   A. the more heat than produced by A.C. when flowing through the same circuit
   B. the same heat as produced by A.C. when flowing through the same circuit
   C. the less heat than produced by A.C. flowing through the same circuit
   D. none of the above

9. The product of apparent power and cosine of the phase angle between circuit voltage and current is

   A. true power
   B. reactive power
   C. volt-amperes
   D. instantaneous power

10. If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?

    A. 42.42 sin 3141
    B. 60 sin 25 t
    C. 30 sin 50 t
    D. 84.84 sin 25 t