Electrician 1st sem – NSQF – Module 6 – AC circuits mock Test July 2, 2025June 19, 2025 by admin TRANSLATE THIS QUIZ IN YOUR LANGUAGE इस प्रश्नोत्तरी का अपनी भाषा में अनुवाद करें <<1234567891011121314151617181920212223242526272829303132333435363738394041424344>> 0% Question 1 of 44 1. In which condition resonance will occur in R-L-C series circuit?Inductive reactance (XL) is greater than capacitive reactance (XC)Inductive reactance (XL) is equal to capacitive reactance (XC)Inductive reactance (XL) is zeroInductive reactance (XL) is less than capacitive reactance (XC)Rate this question: Loading... Question 1 of 44Question 2 of 44 2. Calculate the impedance of the circuit R = 5Ω, XL = 36Ω and XC = 24 Ω. 65 Ω 12 Ω 13 Ω 69 ΩRate this question: Loading... Question 2 of 44Question 3 of 44 3. What is the main cause for below 0.5 lagging power factor in 3 phase system? Due to fluctuation of voltage True power due to resistive load Reactive power due to more inductive load Reactive power due to more capacitive loadRate this question: Loading... Question 3 of 44Question 4 of 44 4. What is the maximum value of voltage for 240 volt RMS? 339.5V 415V 376.8V 240VRate this question: Loading... Question 4 of 44Question 5 of 44 5. What is the P.F if one of the wattmeters reading is zero and the other reads total power in 2 wattmeter method of 3 phase power measurement? Zero Unity Below 0.5 0.5Rate this question: Loading... Question 5 of 44Question 6 of 44 6. What is the unit of susceptance? Ohm Henry Farad MhoRate this question: Loading... Question 6 of 44Question 7 of 44 7. Calculate the power factor of coil having resistance of 24Ω, draws the current of 5A, at 240V/ 50Hz AC supply. 0.5 0.6 0.3 0.8Rate this question: Loading... Question 7 of 44Question 8 of 44 8. Calculate the apparent power in KVA of 3 phase 415V, 50 Hz, star system, if the line current (I L ) is 16A at 0.8 power factor. 5.3 KVA 9.2 KVA 11.5 KVA 15.2 KVARate this question: Loading... Question 8 of 44Question 9 of 44 9. Which electrical term is defined as the total opposition to current in AC parallel circuit? Resistance Impedance Admittance SusceptanceRate this question: Loading... Question 9 of 44Question 10 of 44 10. Which formula is used to calculate Form factor (Kf)?Kf= Maximum value/Effective valueKf= Effective value/Average valueKf = Maximum value/Average valueKf = Average value/Effective valueRate this question: Loading... Question 10 of 44Question 11 of 44 11. What is the relation between the line current (IL ) and phase current (IP ) in delta connected system?IL = IPIL = 3 IPIL = IP /√3IL = √3 IPRate this question: Loading... Question 11 of 44Question 12 of 44 12. What is the form factor (Kf) for sinusoidal AC? 1.11 2.22 1.00 4.44Rate this question: Loading... Question 12 of 44Question 13 of 44 13. What is the current in neutral conductor in 3 phase unbalanced load in star connected system? Lesser than the lowest current in any one of the phases The algebraic sum of current in 2 phases only The algebraic sum of current in 3 phases No current will flowRate this question: Loading... Question 13 of 44Question 14 of 44 14. In which 3 phase system, the artificial neutral is required to measure the phase voltage? 3 wire star connected system 3 wire delta connected system 4 wire delta connected system 4 wire star connected systemRate this question: Loading... Question 14 of 44Question 15 of 44 15. Calculate the value admittance (Y) of the RLC parallel circuit connected across 240volts/50Hz AC supply and 8 Amp. Current is passed through it? 0.003 Mho 0.33 Mho 3.33 Mho 0.033 MhoRate this question: Loading... Question 15 of 44Question 16 of 44 16. What is the relation between the line voltage (V L ) and phase voltage (Vp) in star connected system?VL = 3VpVL =V p /3VL = √3VpVL = Vp /√3Rate this question: Loading... Question 16 of 44Question 17 of 44 17. What is the resistance of the inductive coil takes 5A current across 240V, 50Hz supply at 0.8 power factor? 42.5Ω 26.6Ω 48 Ω 38.4ΩRate this question: Loading... Question 17 of 44Question 18 of 44 18. Calculate the apparent power of a star connected 3 phase load, if it is connected across 3 phase 415volt/50Hz supply at 0.8 p.f and the phase current is 10 Amps. 12.45 KVA 7.188 KVA 57.50 KVA 3.320 KVARate this question: Loading... Question 18 of 44Question 19 of 44 19. How will you obtain positive reading in the wattmeter reads negative reading during 3-phase two wattmeter method? By reversing the pressure coil and current coil connection in meter By reversing the connection of pressure coil in meter By disconnecting the connection of current coil in meter By interchanging the connections of input terminalsRate this question: Loading... Question 19 of 44Question 20 of 44 20. Calculate the total power by two wattmeter (W1 & W2) method, if one of the wattmeter (W2) reading is taken after reversing.W1 x 2W1 + W2W1 - W2W1 onlyRate this question: Loading... Question 20 of 44Question 21 of 44 21. Which AC circuit contains the phase relation between voltage (V) and current (I)? Pure resistive circuit Resistance and inductance circuit Resistance, inductance and capacitance circuit Resistance and capacitance circuitRate this question: Loading... Question 21 of 44Question 22 of 44 22. What is the phase displacement between phases in a 3 phase circuit? 120° 180° 360° 90°Rate this question: Loading... Question 22 of 44Question 23 of 44 23. What is the reciprocal of inductance in AC parallel circuit? Susceptance Admittance Reactance ConductanceRate this question: Loading... Question 23 of 44Question 24 of 44 24. Calculate the power factor of R.L.C circuit having resistance (R) = 15Ω, resultant reactance (X) = 20Ω connected across 240V /50Hz AC supply? 0.8 0.5 0.6 0.7Rate this question: Loading... Question 24 of 44Question 25 of 44 25. How the low power factor (P.F) can be improved in AC circuits? By connecting resistors in series By connecting capacitors in parallel By connecting inductors in series By connecting capacitors in seriesRate this question: Loading... Question 25 of 44Question 26 of 44 26. What is the power factor in a 3 phase power measurement of two wattmeters showing equal readings? 0.5 1 0.8 0Rate this question: Loading... Question 26 of 44Question 27 of 44 27. What is the condition for resonance in RLC series circuit? (Inductive reactance = 'XL', Capacitive reactance = 'XC')XL >√2 XCXL > XCXL = XCXL < XCRate this question: Loading... Question 27 of 44Question 28 of 44 28. What is the power factor if one of the wattmeter gives negative reading in two wattmeter method of 3 phase power measurement? Unity Less than 0.5 0 0.5Rate this question: Loading... Question 28 of 44Question 29 of 44 29. How the resonance frequency (fr) can be increased in A.C series circuit? Increasing the value of resistance Increasing the inductance value Reducing the capacitance value Increasing the capacitance valueRate this question: Loading... Question 29 of 44Question 30 of 44 30. Which condition is called as resonance RLC circuit?XL = XCXL > XCR < XLXC > XLRate this question: Loading... Question 30 of 44Question 31 of 44 31. Which quantity is rotating at a constant angular velocity? Vector quantity Algebraic quantity Phasor quantity Scalar quantityRate this question: Loading... Question 31 of 44Question 32 of 44 32. What is the formula to calculate the impedance (Z) of the R.L.C series circuit, if the inductive reactance (XL ) is less than capacitive rectance (XC)? Z Z Z Z Rate this question: Loading... Question 32 of 44Question 33 of 44 33. What is the formula for Reactive Power (Pr ) in an AC circuit?(Pr )= VI(Pr ) = √2 VI(Pr )= VI sin θ(Pr ) = VI cos θRate this question: Loading... Question 33 of 44Question 34 of 44 34. Which formula is used to calculate the impedance (z) of a RLC series circuit? Z = R + (XC - XL)Z = √R + (XL ∼ XC)Z = √R² + (XL ∼ XC)²Z = R² + (XL ∼ XC)²Rate this question: Loading... Question 34 of 44Question 35 of 44 35. What is the formula to calculate the line current (IL) of this single phase R - C parallel circuit? IL = IR - ICIL= IR + ICIL= IR² + IC²IL= √IR² + IC²Rate this question: Loading... Question 35 of 44Question 36 of 44 36. In a 3 phase system, if the active power is 4 kw and the apparent power is 5 KVA, calculate the reactive power? 3 KVAR 1 KVAR 4 KVAR 2 KVARRate this question: Loading... Question 36 of 44Question 37 of 44 37. What is the phase displacement in a single phase AC circuit? 180° 90° 120° 270°Rate this question: Loading... Question 37 of 44Question 38 of 44 38. What will be the readings of two watt meters (W1 & W2) in 3 phase power measurement, if the power factor is zero?W1 & W2 both are positive readingW1 & is Positive and W 2 is negative readingW1 is equal to W2 but with opposite signsZero W1is Positive reading, and W2 is negative readingRate this question: Loading... Question 38 of 44Question 39 of 44 39. Calculate the line current of the 3 phase 415V 50 HZ supply for the balanced load of 3000 watt at 0.8 power factor is connected in star. 5.2 A 3.4 A 4.5 A 8.5 ARate this question: Loading... Question 39 of 44Question 40 of 44 40. What is the formula to calculate the three phase active power (P) if the line voltage (VL ) and line current is IL and phase angle is 'θ'?P = √ 3 VL IL SinθP = 3 VL IL SinθP = 3 VL IL CosθP = √ 3 VL IL CosθRate this question: Loading... Question 40 of 44Question 41 of 44 41. What is the purpose of phase sequence meter? To indicate the incorrect phase sequence of 3 phase To ensure the correct phase sequence of 3 phase system To protect motor against short circuit fault To control the speed of 3 phase motorRate this question: Loading... Question 41 of 44Question 42 of 44 42. What is the formula to find 3 phase Reactive power (PR) if the line voltage is 'VL' and line current is 'IL'?Pr = VL ILPr = √3VL IL SinθPr = √3VL IL CosθPr = 3VL IL CosθRate this question: Loading... Question 42 of 44Question 43 of 44 43. What relationship is illustrated in between the current and voltage? Current and voltage are in out of phase Current leads ahead of the voltage Current lags behind the voltage Current and voltage are "in phase"Rate this question: Loading... Question 43 of 44Question 44 of 44 44. What is the line voltage in 3 phase system if the phase voltage is 240V? 440 Volt 415 Volt 380 Volt 400 VoltRate this question: Loading... Question 44 of 44 Loading...
