In interpreting 46 CFR, Subchapter J...

Question 1 / 205eccefa4bacbc34ba4d4856f

Question 1 of 205eccefa4bacbc34ba4d4856f

In interpreting 46 CFR, Subchapter J (Electrical Engineering), what are the acceptable variations of steady state voltage and frequency for electrical equipment rated for values of 460 VAC and 60 Hz?

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Question 1 of 20

5eccefa4bacbc34ba4d4856f

In interpreting 46 CFR, Subchapter J (Electrical Engineering), what are the acceptable variations of steady state voltage and frequency for electrical equipment rated for values of 460 VAC and 60 Hz?

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🔍 Key Concepts

• Look at 46 CFR Subchapter J sections that talk about allowable steady-state voltage and frequency variations for shipboard power systems • Convert each answer’s voltage range to a percentage variation from 460 VAC (both low and high limits) • Convert each answer’s frequency range to a percentage variation from 60 Hz (both low and high limits)

💭 Think About

• For each choice, calculate what percent below and above 460 VAC the limits are. Which one matches the CFR limits on steady-state voltage? • Do the same for 60 Hz: what percent below and above 60 Hz are allowed in each option, and which matches the CFR limits on steady-state frequency? • Ask yourself: does Subchapter J allow symmetrical tolerances (same percent high and low) or different values for low and high, and which answer reflects that pattern?

✅ Before You Answer

• Verify in 46 CFR Subchapter J the maximum allowed percentage drop and rise in steady-state voltage from nominal • Verify in the same section the maximum allowed percentage decrease and increase in steady-state frequency from 60 Hz • Before choosing, make sure one option’s percentage band exactly matches both the voltage and frequency tolerances specified in the CFR; if either voltage or frequency is off, eliminate that option

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Question 1 of 20

In interpreting 46 CFR, Subchapter J (Electrical Engineering), what are the acceptable variations of steady state voltage and frequency for electrical equipment rated for values of 460 VAC and 60 Hz?

voltage between 414.0 and 487.6 VAC frequency between 57 and 63 Hz

voltage between 432.4 and 506.0 VAC frequency between 57 and 63 Hz

voltage between 437.0 and 483.0 VAC frequency between 54 and 63.6 Hz

voltage between 437.0 and 483.0 VAC frequency between 56.4 and 66 Hz

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Question 1 / 205eccefa4bacbc34ba4d4856f

Question 1 of 205eccefa4bacbc34ba4d4856f

In interpreting 46 CFR, Subchapter J (Electrical Engineering), what are the acceptable variations of steady state voltage and frequency for electrical equipment rated for values of 460 VAC and 60 Hz?

Back

Question 1 of 20

5eccefa4bacbc34ba4d4856f

In interpreting 46 CFR, Subchapter J (Electrical Engineering), what are the acceptable variations of steady state voltage and frequency for electrical equipment rated for values of 460 VAC and 60 Hz?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed