City Guilds Model Questions Vol1 2017 Engineering Question 42

Practice objective / multiple choice question 42 from the 2017 City Guilds Model Questions Vol1 Engineering examination.

City Guilds Model Questions Vol1 2017 Engineering Objective / Multiple Choice Medium Difficulty
Question 42 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2017 • ENGINEERING • objective

A 240\,V supply feeds a circuit consisting of a 30\,\Omega resistor in series with a parallel combination of a known 20\,\Omega resistor and an unknown resistor \(R_{x}\). The total current drawn from the supply is 5\,A. Find \(R_{x}\) and state the power dissipated in \(R_{x}\). The resistor \(R_{x}\) has a maximum rating of 50\,W; verify whether the rating is exceeded.

Answer Options

A. R_{x}=120\,\Omega, Power dissipated = 28.8\,W (within rating)
B. R_{x}=200\,\Omega, Power dissipated = 50\,W (exceeds rating)
C. R_{x}=150\,\Omega, Power dissipated = 33.75\,W (within rating)
Correct Answer D. R_{x}=180\,\Omega, Power dissipated = 45\,W (within rating)
Correct Answer
D
Correct Option:
R_{x}=180\,\Omega, Power dissipated = 45\,W (within rating)

About This Question

This is City Guilds Model Questions Vol1 2017 Engineering Question 42. It is one of the objective questions from the 2017 City Guilds Model Questions Vol1 Engineering examination.

Difficulty level: Medium .

View More City Guilds Model Questions Vol1 2017 Engineering Questions More City Guilds Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support