A. less than unity
B. unity
C. greater than unity
D. zero
Correct Answer: unity ✔
Last Updated: December 11, 2018
Related MCQs
- In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will__________?
- In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?
- 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?
- The product of apparent power and cosine of the phase angle between circuit voltage and current is
- A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?
- When an alternating current passes through an ohmic resistance the electrical power converted into heat is__________?
- In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters ______?
- The power factor at resonance in R-L- C parallel circuit is________?
- In a pure inductive circuit__________?
- In the case of an unsymmetrical alternating current the average value must always be taken over__________?
- The transient currents are associated with the__________?
- In a pure resistive circuit__________?
- In a circuit containing R, L and C, power loss can take place in__________?
- 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__________?
- The time constant of the capacitance circuit is defined as the time during which voltage________?
- The square waveform of current has following relation between r.m.s. value and average value?
- In a loss-free R-L-C circuit the transient current is__________?
- Power factor of the system is kept high__________?
- Power factor of the following circuit will be zero__________?
- Pure inductive circuit__________?
- Inductance of a coil Varies__________?
- In a highly capacitive circuit the__________?
- Inductance affects the direct current flow__________?
- In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value__________?
- Poor power factor________?
- Time constant of an inductive circuit__________?
- Capacitive reactance is more when_______?
- For a frequency of 200 Hz, the time period will be__________?
- Capacitors for power factor correction are rated in_________?
- The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of_______degrees?
- Form Factor is the ratio of__________?
- For a sine wave with peak value Emax _______ 8.30. the average value is?
- For a sine wave with peak value Imax the r.m.s. value is_______?
- Form factor for a sine wave is________?
- The r.m.s. value and mean value is the same in the case of__________?
- For the same peak value, which of the following wave has the least mean value ?
- The power consumed in a circuit element will be least when the phase difference between the current and voltage is________?
- Two waves of the same frequency have opposite phase when the phase angle between them is_________?
- If two sine waves of the same frequency have a phase difference of JT radians, then_______?
- A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?
- The voltage of domestic supply is 220V. This figure represents__________?
- If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is__________?
- The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_______ohms?
- The period of a wave is__________?
- The form factor is the ratio of_______?
- A sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.
- The double energy transient occur in the__________?
- Power factor of the following circuit will be unity
- Power factor of an inductive circuit is usually improved by connecting capacitor to it in__________?
- All the rules and laws of D.C. circuit also apply to A.C. circuit containing__________?
- The best place to install a capacitor is__________?