The Railway Recruitment Board (RRB) NTPC Computer Based Typing Skill Test (CBTST) is mandatory for posts like Senior Clerk cum Typist, Junior Accounts Assistant cum Typist, Senior Time Keeper, and Junior Clerk cum Typist.
1. RRB NTPC CBTST Speed & Medium Specifications
| Parameter | English CBTST | Hindi CBTST |
|---|---|---|
| Duration | 10 Minutes | 10 Minutes |
| Passage Length | Minimum 300 Words | Minimum 250 Words |
| Net Speed Required | 30 WPM | 25 WPM |
| Error Tolerance | 5% of Total Words Typed | 5% of Total Words Typed |
| Keyboard / Font | Standard QWERTY | KrutiDev 010 / DevLys / Mangal |
| Editing / Backspace | Disabled (Locked) | Disabled (Locked) |
| Retyping Feature | Permitted after reaching end | Permitted after reaching end |
2. The Official RRB 5% Error Penalty Formula
$$\text{Mistakes Allowed (5% Limit)} = \text{Total Words Typed} \times 0.05$$
$$\text{Excess Mistakes} = \text{Total Mistakes} - \text{Mistakes Allowed}$$
$$\text{Penalty Words} = \text{Excess Mistakes} \times 10$$
$$\text{Net Speed (WPM)} = \frac{\text{Total Words Typed} - \text{Penalty Words}}{10 \text{ Minutes}}$$
📊 Calculation Example:
If a candidate types 400 words in 10 minutes and makes 24 mistakes:
- 5% of 400 = 20 mistakes are completely exempt/ignored.
- Excess Mistakes = $24 - 20 = \mathbf{4 \text{ mistakes}}$.
- Penalty Words = $4 \times 10 = \mathbf{40 \text{ words deducted}}$.
- Net Words = $400 - 40 = \mathbf{360 \text{ words}}$.
- Net Speed = $360 / 10 = \mathbf{36 \text{ WPM}}$ $\rightarrow$ QUALIFIED (Above 30 WPM)!
3. Practice on TypingWire
Simulate real RRB NTPC exam conditions with disabled backspace and exact 10x penalty calculations on TypingWire.in.