Test: Poly Phase AC Circuit - 1

# Test: Poly Phase AC Circuit - 1

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## 10 Questions MCQ Test Topicwise Question Bank for Electrical Engineering | Test: Poly Phase AC Circuit - 1

Test: Poly Phase AC Circuit - 1 for Electrical Engineering (EE) 2023 is part of Topicwise Question Bank for Electrical Engineering preparation. The Test: Poly Phase AC Circuit - 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Poly Phase AC Circuit - 1 MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Poly Phase AC Circuit - 1 below.
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Test: Poly Phase AC Circuit - 1 - Question 1

### Which of the following is not true for a three-phase system compared to 1-φ system?

Test: Poly Phase AC Circuit - 1 - Question 2

### In a balanced three-phase star connected system, the phase voltages

Detailed Solution for Test: Poly Phase AC Circuit - 1 - Question 2 Here, line-to-line voltage leads the respective phase voltage by 30°.

Test: Poly Phase AC Circuit - 1 - Question 3

### Three identical resistances are connected in delta against a balanced three-phase voltage supply. If one of the resistances be removed, the reduction in the power will be

Detailed Solution for Test: Poly Phase AC Circuit - 1 - Question 3

When all the resistance are present, (Since Vph= VL for Δ connection)
When one of the phase resistance is removed,  Test: Poly Phase AC Circuit - 1 - Question 4

In a delta connected system, the line current are

Detailed Solution for Test: Poly Phase AC Circuit - 1 - Question 4 Test: Poly Phase AC Circuit - 1 - Question 5

A balanced Y-connected load is supplied from a balanced 3-phase 400 V system. If the current in each phase is 15 A and lags the phase voltage by 30°, the total power will be

Detailed Solution for Test: Poly Phase AC Circuit - 1 - Question 5 Test: Poly Phase AC Circuit - 1 - Question 6

In a balanced three-phase circuit VAN= 1500 ∠20° V and VCN = 1500 ∠-100° V.

The value of VBN will be

Detailed Solution for Test: Poly Phase AC Circuit - 1 - Question 6

Since VCN lags VAN by 120°, therefore phase sequence will be ACB.
Here, VBN will lead VAN  by 120° but, will have the same magnitude.

so, Test: Poly Phase AC Circuit - 1 - Question 7

The value of the rms line voltage VL for the below circuit if the rms line voltage is 100 V will be Detailed Solution for Test: Poly Phase AC Circuit - 1 - Question 7

Converting the Δ-connected load in star equivalent, we have So, line to neutral voltage for equivalent Y-load ∴ Line current,  ∴ Line voltage at source Test: Poly Phase AC Circuit - 1 - Question 8

Two wattmeters, both have reading of 3 kW when connected for the two-wattmeter method with current coils in lines A and B of a 600 V ABC circuit having a balanced A load. The Δ phase impedance will be

Detailed Solution for Test: Poly Phase AC Circuit - 1 - Question 8

we have (Since W1 = W2 = 3 kW)
or, cosθ= 1

Hence, the load will be purely resistive. Test: Poly Phase AC Circuit - 1 - Question 9

Three capacitances, each of C/3 Farads are connected in delta. Their equivalent star value for each capacitance is

Detailed Solution for Test: Poly Phase AC Circuit - 1 - Question 9

We know that,  Test: Poly Phase AC Circuit - 1 - Question 10

The instantaneous value of currents in both phases B and C of a 3-phase balanced system are -20 A. For a phase sequence of ABC, the instantaneous value of current in phase A is

Detailed Solution for Test: Poly Phase AC Circuit - 1 - Question 10

Since the system is balanced, therefore ## Topicwise Question Bank for Electrical Engineering

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