Question 1
A 500 kVA, 11 kV / 400 V distribution transformer has a full-load copper loss of 4.5 kW and an iron loss of 2.5 kW. What is the efficiency of the transformer at full load operating at a power factor of 0.8 lagging?
Correct Answer:
98.28%
Question 2
A 1000 kVA power transformer has a core (iron) loss of 3.0 kW and a full-load copper loss of 12.0 kW. At what load (in kVA) will the transformer achieve its maximum efficiency?
Correct Answer:
500 kVA
Question 3
Two 3-phase transformers A and B are connected in parallel to serve a total load of 700 kVA. Transformer A is rated at 500 kVA with 4% impedance, and Transformer B is rated at 250 kVA with 5% impedance. Assuming equal voltage ratios, how much load does Transformer A carry?
Correct Answer:
500 kVA
Question 4
A 4-pole, 3-phase induction motor operates from a 50 Hz supply. If the actual rotor speed is measured at 1440 rpm, what is the slip of the motor?
Correct Answer:
4.0%
Question 5
A 6-pole, 50 Hz, 3-phase induction motor runs at a slip of 3%. What is the frequency of the rotor currents under this operating condition?
Correct Answer:
1.5 Hz
Question 1
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Prepare with the GCC Factories Plant Engineering Exam Practice Questions - GCC Factories Engineer - Plant Engineering Examination (South Africa) Exam practice quiz. This question bank includes 100 questions covering calculate, power, load, steam, and transformer. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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GCC Factories Plant Engineering Exam Practice Questions - GCC Factories Engineer - Plant Engineering Examination (South Africa) Exam

This practice set contains 100 questions from the matching question bank and focuses on calculate, power, load, steam, and transformer. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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