Plumbing Systems MCQ with answer and solution

Concept

Standard household electrical voltage in India is 220V–230V AC single-phase.

Step-by-step solution

1. Identify the standard residential electrical supply system in India. 2. Recall that the nominal voltage for domestic household wiring is 230 V single-phase (commonly represented as 220V in standard multiple-choice questions). 3. Match with the correct option.

Explanation

In India, the standard low-voltage electrical supply for residential (household) systems is single-phase 230 V (often referred to historically and broadly as 220V–240V AC) at a frequency of 50 Hz. Among the given options, 220V is the standard nominal household voltage recognized in general technical and competitive exam contexts.

Why the other options are wrong

A: 110V is the standard household voltage in the USA and several other countries. C: 440V is used for heavy industrial applications or three-phase line-to-line systems. D: 600V is used for heavy industrial or high-voltage distribution systems, not households.

Shortcut

Remember that household supply is 220V–230V, whereas industrial/three-phase line-to-line voltage is 415V–440V.

Common mistake

Confusing household single-phase voltage (220V/230V) with three-phase industrial voltage (415V/440V) or US standard household voltage (110V/120V).