**Option A:** current is maximum

**Option B:** current is minimum

**Option C:** impedance is maximum

**Option D:** voltage across C is minimum

**Correct Answer: **current is maximum ✔

Click for More Details

**Option A:** apparent power is more than actual power

**Option B:** reactive power is more than apparent power

**Option C:** actual power is more than reactive power

**Option D:** reactive power is more than actual power

**Correct Answer: **apparent power is more than actual power ✔

Click for More Details

**Option A:** increases with the decrease of capacitance and decrease of resistance

**Option B:** increases with the decrease of capacitance and increase of resistance

**Option C:** increases with the increase of capacitance and decrease of resistance

**Option D:** increase with increase of capacitance and increase of resistance

**Correct Answer: **increase with increase of capacitance and increase of resistance ✔

Click for More Details

**Option A:** is unaffected by the supply frequency

**Option B:** decreases with the increase in supply frequency

**Option C:** increases with the increase in supply frequency

**Option D:** becomes zero with the increase in supply frequency

**Correct Answer: **increases with the increase in supply frequency ✔

Click for More Details

**Option A:** actual power is zero

**Option B:** reactive power is zero

**Option C:** apparent power is zero

**Option D:** none of above is zero

**Correct Answer: **actual power is zero ✔

Click for More Details

**Option A:** increases with increase of inductance and decrease of resistance

**Option B:** increases with the increase of inductance and the increase of resistance

**Option C:** increases with the decrease of inductance and decrease of resistance

**Option D:** increases with decrease of inductance and increase of resistance

**Correct Answer: **increases with increase of inductance and decrease of resistance ✔

Click for More Details

**Option A:** depends upon the magnitude of R

**Option B:** depends upon the magnitude of L

**Option C:** depends upon the magnitude of C

**Option D:** depends upon the magnitude of R, Land C

**Correct Answer: **depends upon the magnitude of R ✔

Click for More Details

**Option A:** R only

**Option B:** L only

**Option C:** C only

**Option D:** LorC

**Correct Answer: **LorC ✔

Click for More Details

**Option A:** applied voltage decreases but current increases

**Option B:** applied voltage increases but current decreases

**Option C:** both applied voltage and current increase

**Option D:** both applied voltage and current decrease

**Correct Answer: **applied voltage decreases but current increases ✔

Click for More Details

**Option A:** Inductance

**Option B:** Capacitance

**Option C:** Conductance

**Option D:** Resistance

**Correct Answer: **Capacitance ✔

Click for More Details

**Option A:** zero

**Option B:** lagging

**Option C:** leading

**Option D:** unity

**Correct Answer: **unity ✔

Click for More Details

**Option A:** 25% of maximum value

**Option B:** 50% of maximum value

**Option C:** 63% of maximum value

**Option D:** 90% of the maximum value

**Correct Answer: **63% of maximum value ✔

Click for More Details

**Option A:** 4 mA

**Option B:** 9 mA

**Option C:** 15 mA

**Option D:** 25 mA

**Correct Answer: **9 mA ✔

Click for More Details

**Option A:** 0.001 s

**Option B:** 0.1 s

**Option C:** 10 s

**Option D:** 100 s

**Correct Answer: **0.1 s ✔

Click for More Details

**Option A:** power is consumed in resistance and is equal to I R

**Option B:** exchange of power takes place between inductor and supply line

**Option C:** exchange of power takes place between capacitor and supply line

**Option D:** exchange of power does not take place between resistance and the supply line

**Correct Answer: **all above are correct ✔

Click for More Details

**Option A:** 42.42 sin 3141

**Option B:** 60 sin 25 t

**Option C:** 30 sin 50 t

**Option D:** 84.84 sin 25 t

**Correct Answer: **42.42 sin 3141 ✔

Click for More Details

**Option A:** A coil with large resistance

**Option B:** A coil with low resistance

**Option C:** A coil with large distributed capacitance

**Option D:** A coil with low distributed capacitance

**Correct Answer: **A coil with large distributed capacitance ✔

Click for More Details

**Option A:** low efficiency

**Option B:** high power factor

**Option C:** unity power factor

**Option D:** maximum load current

**Correct Answer: **high power factor ✔

Click for More Details

**Option A:** 12 kW

**Option B:** 22 kW

**Option C:** 32 kW

**Option D:** 64 kW

**Correct Answer: **32 kW ✔

Click for More Details

**Option A:** the big size of the inductor

**Option B:** the reactance of the inductor

**Option C:** the current flowing in the inductor

**Option D:** the statement given is false

**Correct Answer: **the statement given is false ✔

Click for More Details

**Option A:** iron loss in core

**Option B:** skin effect

**Option C:** increase in temperature

**Option D:** capacitive effect between adjacent coil turns

**Correct Answer: **iron loss in core ✔

Click for More Details

**Option A:** demand

**Option B:** load

**Option C:** power

**Option D:** form

**Correct Answer: **power ✔

Click for More Details

**Option A:** 4 kVAR

**Option B:** 6 kVAR

**Option C:** 8 kVAR

**Option D:** 16 kVAR

**Correct Answer: **6 kVAR ✔

Click for More Details

**Option A:** have a high voltage developed across each inductive and capacitive section

**Option B:** have a high impedance

**Option C:** act like a resistor of low value

**Option D:** have current in each section equal to the line current

**Correct Answer: **have a high impedance ✔

Click for More Details

**Option A:** reduce eddy current loss

**Option B:** increase heat radiation

**Option C:** make assembly cheap and easier

**Option D:** reduce circuit permeability

**Correct Answer: **reduce eddy current loss ✔

Click for More Details

**Option A:** ratio of net reactance and impedance

**Option B:** ratio of kW and kVA

**Option C:** ratio of J and Z

**Option D:** ratio of W and VA

**Correct Answer: **ratio of net reactance and impedance ✔

Click for More Details

**Option A:** current

**Option B:** voltage

**Option C:** power

**Option D:** frequency

**Correct Answer: **voltage ✔

Click for More Details

**Option A:** create more electrical noise

**Option B:** are likely to melt under excessive eddy current heat

**Option C:** consume more power

**Option D:** exhibit unwanted inductive and capacitive effects

**Correct Answer: **exhibit unwanted inductive and capacitive effects ✔

Click for More Details

**Option A:** can dissipate considerable amount of power

**Option B:** can act as energy storage devices

**Option C:** connecting them in parallel in¬creases the total value

**Option D:** oppose sudden changes in voltage

**Correct Answer: **can dissipate considerable amount of power ✔

Click for More Details

**Option A:** a line which represents the magnitude and phase of an alternating quantity

**Option B:** a line representing the magnitude and direction of an alternating quantity

**Option C:** a coloured tag or band for distinction between different phases of a 3-phase supply

**Option D:** an instrument used for measuring phases of an unbalanced 3-phase load

**Correct Answer: **a line which represents the magnitude and phase of an alternating quantity ✔

Click for More Details

**Option A:** reactive power in a circuit

**Option B:** the extent of neutralisation of reactive power in a circuit

**Option C:** a purely capacitive circuit’s ability to pass current

**Option D:** a purely capacitive circuit’s ability to resist the flow of current

**Correct Answer: **a purely capacitive circuit’s ability to pass current ✔

Click for More Details

**Option A:** lags

**Option B:** leads

**Option C:** remains in phase with

**Option D:** none of the above

**Correct Answer: **leads ✔

Click for More Details

**Option A:** The current through each element is same

**Option B:** The voltage across element is in proportion to it’s resistance value

**Option C:** The equivalent resistance is greater than any one of the resistors

**Option D:** The current through any one element is less than the source current

**Correct Answer: **The current through any one element is less than the source current ✔

Click for More Details

**Option A:** between 0° and 90°

**Option B:** between 90° and 180°

**Option C:** between 180° and 270°

**Option D:** no where

**Correct Answer: **no where ✔

Click for More Details

**Option A:** resistance only

**Option B:** inductance only

**Option C:** capacitance only

**Option D:** none of the above

**Correct Answer: **resistance only ✔

Click for More Details

**Option A:** very low

**Option B:** low

**Option C:** medium

**Option D:** high

**Correct Answer: **high ✔

Click for More Details

**Option A:** electronic equipment

**Option B:** transformers

**Option C:** current transformers

**Option D:** auto transformers

**Correct Answer: **electronic equipment ✔

Click for More Details

**Option A:** low

**Option B:** very low

**Option C:** high

**Option D:** very high

**Correct Answer: **high ✔

Click for More Details

**Option A:** resistive

**Option B:** inductive

**Option C:** capacitive

**Option D:** none of the above

**Correct Answer: **capacitive ✔

Click for More Details

**Option A:** 200 Hz

**Option B:** 100 Hz

**Option C:** 60 Hz

**Option D:** 50 Hz

**Correct Answer: **50 Hz ✔

Click for More Details

**Option A:** high voltage across the load

**Option B:** low voltage across the load

**Option C:** unequal line voltages across the load

**Option D:** minimun voltage across the load

**Correct Answer: **unequal line voltages across the load ✔

Click for More Details

**Option A:** 282.8 V

**Option B:** 141.4 V

**Option C:** 111 V

**Option D:** 100 V

**Correct Answer: **282.8 V ✔

Click for More Details

**Option A:** Square wave

**Option B:** Sine wave

**Option C:** Half wave rectified sine wave

**Option D:** Triangular wave

**Correct Answer: **Half wave rectified sine wave ✔

Click for More Details

**Option A:** increasing core length

**Option B:** decreasing the number of turns

**Option C:** decreasing the diameter of the former

**Option D:** choosing core material having high relative permeability

**Correct Answer: **choosing core material having high relative permeability ✔

Click for More Details

**Option A:** Vc and VR

**Option B:** VL and VR

**Option C:** Vc and VL

**Option D:** none of the above

**Correct Answer: **Vc and VL ✔

Click for More Details

**Option A:** 0.5 of peak value

**Option B:** 0.707 of peak value

**Option C:** same as peak value

**Option D:** zero

**Correct Answer: **0.707 of peak value ✔

Click for More Details

**Option A:** series resistance needs a low-resistance source for sharp rise in current

**Option B:** series resonance needs a high-resistance source for sharp increase in current

**Option C:** parallel resonance needs a low-resistance source for a sharp in¬crease in impedance

**Option D:** parallel resonance needs a low-resistance source for a sharp rise in line current

**Correct Answer: **series resistance needs a low-resistance source for sharp rise in current ✔

Click for More Details

**Option A:** the speed with which the alternator runs

**Option B:** the number of cycles generated in one minute

**Option C:** the number of waves passing through a point in one second

**Option D:** the number of electrons passing through a point in one second

**Correct Answer: **the number of waves passing through a point in one second ✔

Click for More Details

**Option A:** inductive reactance

**Option B:** capacitive reactance

**Option C:** resistance

**Option D:** capacitance

**Correct Answer: **capacitance ✔

Click for More Details

**Option A:** 60 sin 25 t

**Option B:** 60 sin 50 t

**Option C:** 84.84 sin 3141

**Option D:** 42.42 sin 314 t

**Correct Answer: **84.84 sin 3141 ✔

Click for More Details

**Option A:** less than unity

**Option B:** unity

**Option C:** greater than unity

**Option D:** zero

**Correct Answer: **unity ✔

Click for More Details

## In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will__________?

**Option A:** be reduced by half

**Option B:** be doubled

**Option C:** be four times as high

**Option D:** be reduced to one fourth

**Correct Answer: **be doubled ✔

Click for More Details

## In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?

**Option A:** be reduced by half

**Option B:** be doubled

**Option C:** be four times at high

**Option D:** be reduced to one fourth

**Correct Answer: **be reduced by half ✔

Click for More Details

**Option A:** the current through the resistance is more

**Option B:** the current through the resistance is less

**Option C:** both resistance and inductance carry equal currents

**Option D:** none of the above

**Correct Answer: **both resistance and inductance carry equal currents ✔

Click for More Details

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

**Option A:** true power

**Option B:** reactive power

**Option C:** volt-amperes

**Option D:** instantaneous power

**Correct Answer: **true power ✔

Click for More Details

**Option A:** the capacitive reactance in ohms

**Option B:** the current flowing in capacitor

**Option C:** the size of the capacitor being quite big

**Option D:** the statement is incorrect

**Correct Answer: **the statement is incorrect ✔

Click for More Details

**Option A:** apparent power

**Option B:** true power

**Option C:** reactive power

**Option D:** none of the above

**Correct Answer: **true power ✔

Click for More Details

**Option A:** 220 V

**Option B:** 220V3V

**Option C:** 220/V3 V

**Option D:** none of the above

**Correct Answer: **220 V ✔

Click for More Details

**Option A:** zero

**Option B:** 0.08 lagging

**Option C:** 0.8 leading

**Option D:** unity

**Correct Answer: **unity ✔

Click for More Details

**Option A:** the current is in phase with the voltage

**Option B:** the current lags behind the voltage by 90°

**Option C:** the current leads the voltage by 90°

**Option D:** the current can lead or lag by 90°

**Correct Answer: **the current lags behind the voltage by 90° ✔

Click for More Details

**Option A:** unsymmetrical part of the wave form

**Option B:** the quarter cycle

**Option C:** the half cycle

**Option D:** the whole cycle

**Correct Answer: **the whole cycle ✔

Click for More Details

**Option A:** changes in the stored energy in the inductors and capacitors

**Option B:** impedance of the circuit

**Option C:** applied voltage to the circuit

**Option D:** resistance of the circuit

**Correct Answer: **A. changes in the stored energy in the inductors and capacitor ✔

Click for More Details

**Option A:** current lags behind the voltage by 90°

**Option B:** current leads the voltage by 90°

**Option C:** current can lead or lag the voltage by 90°

**Option D:** current is in phase with the voltage

**Correct Answer: **current is in phase with the voltage ✔

Click for More Details

**Option A:** C only

**Option B:** L only

**Option C:** R only

**Option D:** all above

**Correct Answer: **R only ✔

Click for More Details

**Option A:** the more heat than produced by A.C. when flowing through the same circuit

**Option B:** the same heat as produced by A.C. when flowing through the same circuit

**Option C:** the less heat than produced by A.C. flowing through the same circuit

**Option D:** none of the above

**Correct Answer: **B. the same heat as produced by A.C. when flowing through the same circuit ✔

Click for More Details

## The time constant of the capacitance circuit is defined as the time during which voltage________?

**Option A:** falls to 36.8% of its final steady value

**Option B:** rises to 38.6% of its final steady value

**Option C:** rises to 63.2% of its final steady value

**Option D:** none of the above

**Correct Answer: **rises to 63.2% of its final steady value ✔

Click for More Details

**Option A:** r.m.s. value is equal to average value

**Option B:** r.m.s. value of current is greater than average value

**Option C:** r.m.s. value of current is less than average value

**Option D:** none of the above

**Correct Answer: **r.m.s. value is equal to average value ✔

Click for More Details

**Option A:** oscillating

**Option B:** square wave

**Option C:** sinusoidal

**Option D:** non-oscillating

**Correct Answer: **sinusoidal ✔

Click for More Details

**Option A:** to reduce line losses

**Option B:** to maximise the utilization of the capacities of generators, lines and transformers

**Option C:** to reduce voltage regulation of the line

**Option D:** due to all above reasons

**Correct Answer: **due to all above reasons ✔

Click for More Details

**Option A:** resistance

**Option B:** inductance

**Option C:** capacitance

**Option D:** both B. and C.

**Correct Answer: **D. both B. and C. ✔

Click for More Details

**Option A:** consumes some power on average

**Option B:** does not take power at all from a line

**Option C:** takes power from the line during some part of the cycle and then returns back to it during other part of the cycle

**Option D:** none of the above

**Correct Answer: **takes power from the line during some part of the cycle and then returns back to it during other part of the cycle ✔

Click for More Details

**Option A:** directly as the cross-sectional area of magnetic core

**Option B:** directly as square of number of turns

**Option C:** directly as the permeability of the core

**Option D:** inversely as the length of the iron path

**Correct Answer: **E. as A. to (d) ✔

Click for More Details

**Option A:** apparent power is equal to the actual power

**Option B:** reactive power is more than the apparent power

**Option C:** reactive power is more than the actual power

**Option D:** actual power is more than its reactive power

**Correct Answer: **reactive power is more than the actual power ✔

Click for More Details

**Option A:** only at the time of turning off

**Option B:** only at the time of turning on

**Option C:** at the time of turning on and off

**Option D:** at all the time of operation

**Correct Answer: ** ✔

Click for More Details

**Option A:** will change the maximum value of current at resonance

**Option B:** will change the resonance frequency

**Option C:** will change the impedance at resonance frequency

**Option D:** will increase the selectivity of the circuit

**Correct Answer: **will increase the selectivity of the circuit ✔

Click for More Details

**Option A:** reduces load handling capability of electrical system

**Option B:** results in more power losses in the electrical system

**Option C:** overloads alternators, transformers and distribution lines

**Option D:** results in more voltage drop in the line

**Correct Answer: **results in all above ✔

Click for More Details

**Option A:** increases with increase of inductance and decrease of resistance

**Option B:** increases with the increase of inductance and the increase of resistance

**Option C:** increases with decrease of inductance and decrease of resistance

**Option D:** increases with decrease of inductance and increase of resistance

**Correct Answer: **increases with increase of inductance and decrease of resistance ✔

Click for More Details

**Option A:** capacitance is less and frequency of supply is less

**Option B:** capacitance is less and frequency of supply is more

**Option C:** capacitance is more and frequency of supply is less

**Option D:** capacitance is more and frequency of supply is more

**Correct Answer: **capacitance is less and frequency of supply is less ✔

Click for More Details

**Option A:** 0.05 s

**Option B:** 0.005 s

**Option C:** 0.0005 s

**Option D:** 0.5 s

**Correct Answer: **0.005 s ✔

Click for More Details

**Option A:** average value/r.m.s. value

**Option B:** average value/peak value

**Option C:** r.m.s. value/average value

**Option D:** r.m.s. value/peak value

**Correct Answer: **r.m.s. value/average value ✔

Click for More Details

**Option A:** 0.636 Emax

**Option B:** 0.707 Emax

**Option C:** 0.434 EWc

**Option D:** lAUEmax

**Correct Answer: **0.636 Emax ✔

Click for More Details

**Option A:** 0.5 Imax

**Option B:** 0.707

**Option C:** 0.9

**Option D:** 1.414 Lmax

**Correct Answer: **0.707 ✔

Click for More Details

**Option A:** 1.414

**Option B:** 0.707

**Option C:** 1.11

**Option D:** 0.637

**Correct Answer: **1.11 ✔

Click for More Details

**Option A:** triangular wave

**Option B:** sine wave

**Option C:** square wave

**Option D:** half wave rectified sine wave

**Correct Answer: **square wave ✔

Click for More Details

**Option A:** half wave rectified sine wave

**Option B:** triangular wave

**Option C:** sine wave

**Option D:** square wave

**Correct Answer: **half wave rectified sine wave ✔

Click for More Details

**Option A:** 180″

**Option B:** 90°

**Option C:** 60°

**Option D:** 0°

**Correct Answer: **90° ✔

Click for More Details

## Two waves of the same frequency have opposite phase when the phase angle between them is_________?

**Option A:** 360°

**Option B:** 180°

**Option C:** 90°

**Option D:** 0°

**Correct Answer: **180° ✔

Click for More Details

**Option A:** both will reach their minimum values at the same instant

**Option B:** both will reach their maximum values at the same instant

**Option C:** when one wave reaches its maxi¬mum value, the other will reach its minimum value

**Option D:** none of the above

**Correct Answer: **when one wave reaches its maxi¬mum value, the other will reach its minimum value ✔

Click for More Details

**Option A:** average voltage

**Option B:** r.m.s. voltage

**Option C:** peak voltage

**Option D:** none of the above

**Correct Answer: **r.m.s. voltage ✔

Click for More Details

**Option A:** mean value

**Option B:** r.m.s. value

**Option C:** peak value

**Option D:** average value

**Correct Answer: **mean value ✔

Click for More Details

**Option A:** a sinusoid of the same frequency

**Option B:** a sinusoid of half the original frequency

**Option C:** a sinusoid of double the frequency

**Option D:** not a sinusoid

**Correct Answer: **a sinusoid of the same frequency ✔

Click for More Details

**Option A:** the same as frequency

**Option B:** time required to complete one cycle

**Option C:** expressed in amperes

**Option D:** none of the above

**Correct Answer: **time required to complete one cycle ✔

Click for More Details

**Option A:** peak value to r.m.s. value

**Option B:** r.m.s. value to average value

**Option C:** average value to r.m.s. value

**Option D:** none of the above

**Correct Answer: **r.m.s. value to average value ✔

Click for More Details

**Option A:** 100 n

**Option B:** 50 jt

**Option C:** 25 JT

**Option D:** 5 n

**Correct Answer: **100 n ✔

Click for More Details

**Option A:** purely inductive circuit

**Option B:** R-L circuit

**Option C:** R-C circuit

**Option D:** R-L-C circuit

**Correct Answer: **R-L-C circuit ✔

Click for More Details