Wireman – Semester 3, Module 5 - Three phase circuit

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Common for Wireman Trade 2nd Year

NAME *

NAME OF THE ITI *

MOBILE NUMBER *

1 : What is the angular displacement of 3 phase voltages? *

2 points

A : 120 electrical degrees

B : 90 electrical degrees

C : 180 electrical degrees

D : 360 electrical degrees

2 : What is the factor relating to line voltage and phase voltage? *

2 points

A : √3

B : √2

C : 1

D : 3

3 : What is the formula for power in delta connection *

3 points

4 : What is the value of neutral current in balanced star connected 3 phase load? *

2 points

5 : What is the relation between line voltage(VL) and phase voltage (Vph) in 3 phase delta connection? *

3 points

6 : What is the line voltage if phase voltage is 415V in delta connection? *

2 points

A : 415V

B : 400

C : 240V

D : 138V

7 : Which is the type of load when the phase currents of a 3 phase circuit are same? *

2 points

A : Balanced load

B : Unbalanced load

C : No load

D : Full load

8 : Which is the type of load if the phase currents of a 3 phase system are different? *

2 points

A : Full load

B : No load

C : Balanced load

D : Unbalanced load

9 : How many number of watt meter to be used for balanced 3 phase power measurement? *

3 points

A : One

B : Two

C : Three

D : Four

10: Which method is used for 3f power measurement when load is unbalanced? *

2 points

A : One watt meter method

B : Voltmeter method

C : Ammeter method

D : Three watt meter method

11 : What is the value of power factor when two watt meter readings are equal in 2 watt meter method of power measurement? *

3 points

A : Unity

B : 0.5 lagging

C : 0.5 leading

D : Less than 0.5

12 : What is the reading in second watt meter W2 if the first watt meter reading is W1 = 100 W at the p.f 0.5? *

3 points

A : 200W

B : Zero

C : 100W

D : 50W

13: What is the formula for total power in three watt meter method of power measurement? *

3 points

A : W1 - W2

B : W1+W2+W3

C : W1+W2

D : W1(W2+W3)

14 : Where two watt meter method of power measurement is used? *

2 points

A : Balanced load only

B : Unbalanced load only

C : Balanced and unbalanced load

D : Half full load

15 : What is the value of line current if phase current is 10 Amp in star connection? *

3 points

A : 17.3 Amp

B : 10 Amp

C : 5 Amp

D : 9 Amp

16: Calculate the phase current if the line current is 30 Amp in delta connection? *

3 points

A : 30A

B : 17.3A

C : 15.6A

D : 10Amp

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