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Professional Electrical Engineering Quiz 2 part 2

Authored by Dem Louise

Mathematics

University

Used 10+ times

Professional Electrical Engineering Quiz 2 part  2
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46 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A 6-pole lap wound dc generator has 240 armature conductors, a flux of 0.04 Wb per pole and runs at 1,500 rpm. If the armature resistance is 0.8 Ω, determine the current through each conductor.

300 A

100 A

50 A

25 A

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An air-cored toroidal coil has 450 turns and a mean diameter of 300 mm and a cross-sectional area of 300 mm². Determine the self-inductance of the coil.

81 x 10⁻⁴ H

1.81 x 10⁻⁴ H

0.81 x 10⁻⁴ H

0.081 x 10⁻⁴ H

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A 4-pole, three-phase 50 Hz induction motor develops a maximum torque of 20 N·m at 1,440 rpm. Obtain the torque exerted by the motor at 5% slip.

16.51 N-m

17.51 N-m

18.51 N-m

19.51 N-m

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A transformer has negligible resistance and a p.u. reactance of 0.1. What is its voltage regulation on full load with a leading p.f. angle of 30°?

-10%

10%

5%

-5%

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In an ac circuit, a low value of KVAR compared with KW indicates

maximum load current

low efficiency

high power factor

unity power factor

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The frequency of the emf in the stator of a 4-pole induction motor is 60 Hz, and that in the rotor is 2 Hz. At what speed is the motor running?

1,720 rpm

1,740 rpm

1,760 rpm

1,780 rpm

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The voltage across a 50-µF capacitor rises at a constant rate of 10 V/ms. Calculate the current through the capacitor.

50 mA

500 mA

5 mA

5 A

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