Gce Model Questions Vol1 2021 Physics Question 9

Practice objective / multiple choice question 9 from the 2021 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2021 Physics Objective / Multiple Choice Medium Difficulty
Question 9 GCE_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A three‑phase induction motor runs at 1500 rev min⁻¹ and delivers a torque of 12 N·m. The line voltage is 400 V, the power factor is 0.85 lagging and the total losses amount to 1.2 kW. Determine (a) the mechanical power output, (b) the efficiency of the motor, and (c) the line current drawn. Give the efficiency as a percentage to one decimal place and the current to two decimal places.

Answer Options

Correct Answer A. P_out=1.89 kW; efficiency=61.1 %; I=3.20 A
B. P_out=1.70 kW; efficiency=55.0 %; I=3.50 A
C. P_out=2.10 kW; efficiency=68.5 %; I=2.85 A
D. P_out=1.89 kW; efficiency=70.0 %; I=3.20 A
Correct Answer
A
Correct Option:
P_out=1.89 kW; efficiency=61.1 %; I=3.20 A

About This Question

This is Gce Model Questions Vol1 2021 Physics Question 9. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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