Wireman – Semester 1, Module 8: AC Circuits

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Common for Wireman Trade 1st Year

NAME *

NAME OF THE ITI *

MOBILE NUMBER *

1 : What is the value of form factor? *

2 points

A : 1.23

B : 1.11

C : 0.81

D : 0.707

2 : What is the RMS value of alternating voltage? *

2 points

A : 0.637 X Vav

B : 0.707 X Vav

C : 0.637 X Vmax

D : 0.707 X Vmax

3 : What is the name of AC value is illustratedin dotted lines? *

2 points

A : Effective value

B : Peak value

C : Average value

D : Instantaneous value

4 : Which quantity is rotating at a constant angular velocity? *

2 points

A : Scalar quantity

B : Vector quantity

C : Phasor quantity

D : Algebraic quantity

5 : What is the shape of the waveform of A/C? *

2 points

A : Sine wave

B : Square wave

C : Sawtooh wave

D : Pulsating wave

6 : Which AC circuit wave form is illustrated? *

2 points

A : Pure resistive circuit

B : Pure inductive circuit

C : Resistive and inductive circuit

D : Inductance and capacitance circuit

7 : What is the inductive reactance of a coil having 20 H inductance operating at 50 Hz supply frequency?

2 points

A : 6252Ω

B : 6273Ω

C : 6284Ω

D : 6382Ω

frequency?

Clear selection

8 : Which formula is used to find impedance of a RLC series circuit? *

2 points

9 : Which formula is used to calculate power factor (Cosθ) of an AC circuit? *

2 points

10 : Which formula is used to calculate reactive power (Pr)? *

2 points

A : Pᵣ = VI cosθ

B : Pᵣ = VI sinθ

C : Pᵣ = Wθ

D : Pᵣ = VI tanθ

11 : What is the formula for calculating admittances (Y) of a AC parallel circuit? *

2 points

12 : What is the reciprocal of resistance in AC parallel circuit? *

2 points

A : Reactance

B : Admittance

C : Conductance

D : Susceptance

13: What is the S.I unit of frequency? *

2 points

A : Kilo Hertz

B : Hertz

C : Mega Hertz

D : Giga Hertz

14: What is power in pure inductive AC circuit? *

2 points

A : 0 KW

B : 1 KW

C : 2 KW

D : 5 KW

15: What is inductive reactance of AC inductive circuit if the inductance value is 4H? *

2 points

A : 1256 ohms

B : 1258 ohms

C : 1260 ohms

D : 1262 ohms

16: What is the name of total opposition offered by RLC series circuit? *

2 points

A : Inductive reactance

B : Capacitive reactance

C : Impedance

D : Admittance

17: Which formula is used to calculate the impedance (Z) of R.L.Series circuit? *

2 points

18: What is the formula for power in AC RC series circuit? *

2 points

A : VI

B : VI cos

C : VI sin

D :  VI

19: What is effect of current in a RC parallel circuit? *

2 points

A : IC Leads IR by 90°

B : IC Lags IR by 90°

C : IR Leads IC 90°

D : IR & IC are in phase

20: What is impedance in AC, RL series circuit if resistance is 3 ohm and inductive reactance 4o hm? *

2 points

A : 3 ohm

B : 5 ohm

C : 7 ohm

D : 12 ohm

1 : What is the relationship between line and phase current in delta connection? *

2 points

22 : Which formula to find phase voltage in 3 phase star connection? *

2 points

23 : What is the reactive power, if the activepower is 4 Kw, and the apparent power is 5 Kw in a3 phase circuit? *

2 points

A : 1 Kw

B : 2 Kw

C : 3 Kw

D : 4 Kw

24 : Where the artificial neutral is required for measuring phase voltage in 3 phase circuit? *

2 points

A : 3 wire star connected system

B : 4 wire star connected system

C : 3 wire delta connected system

D : 4 wire delta connected system

25 : What is the power factor, if one watt meter reads zero and other reads some positive reading in two watt meter method of 3 phase power measurement? *

2 points

A : Unity

B : Above 0.5

C : 0.5

D : Below 0.5

26 : Which is the formula to calculate the power consumed in a balanced load in star or delta connected system? *

2 points

27 : What is the name of star point in star connection system? *

2 points

A : Neutral point

B : Cross point

C : Tapping point

D : Phase tapping wire

28 : What will be the neutral current in 3 phase-unbalanced circuits? *

2 points

A : One

B : More than one

C : Zero

D : Not zero

29 : In a 3 balanced star connected system having a phase voltage of 240 V calculate the line voltage in the circuit? *

2 points

A : 400 V

B : 415 V

C : 430 V

D : 450 V

30 : Which type of the power measurement is used for balanced and unbalanced louds in 3 phase system? *

2 points

A : Single wattmeter method

B : Two wattmeter method

C : Three wattmeter method

D : Voltmeter and ammeter method

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