Qwestrum Engineering360 · Industrial & Production · Work Study & Ergonomics
Time Study and Standard Time
Time study establishes realistic standard time by combining observed cycles, rating, and allowances.
Exam tip: keep SI units consistent end-to-end, write the governing relation symbolically before substituting, and sanity-check magnitude and sign.
Key formulas & points
Skim these first — then read the full notes below.
- Multiple cycles averaged; discard abnormal
- Contingency allowance for minor delays
- Standard data from MTM-1, MTM-2 databases
Topic details
Introduction
This topic links work-study fundamentals to production control. Chase and Groover both treat standard time as a planning baseline for staffing, scheduling, and cost estimation.
Key relations & formulas
(1 + A/100)
Formulas (Indian textbook notation)
Formulas (Indian textbook notation)
Notation and sign conventions
Relation 1 —
(1 + A/100)
Write this relation with symbols exactly as in Industrial Engineering & Management — O.P. Khanna before substituting numbers. Examiners award partial marks for a correct setup even when arithmetic slips.
Relation 2 —
Formulas (Indian textbook notation)
Write this relation with symbols exactly as in Industrial Engineering & Management — O.P. Khanna before substituting numbers. Examiners award partial marks for a correct setup even when arithmetic slips.
Relation 3 —
Formulas (Indian textbook notation)
Write this relation with symbols exactly as in Industrial Engineering & Management — O.P. Khanna before substituting numbers. Examiners award partial marks for a correct setup even when arithmetic slips.
Concept in depth
Cycle time reflects actual pace, takt time reflects market requirement, and standard time reflects expected sustainable pace including allowances. In B.Tech numericals, students should clearly present sequence: observations -> average -> rating correction -> allowances. Mahajan-based solving format with unit checks gives clean scoring.
Assumptions and validity limits
State assumptions explicitly before using any relation for time study and standard time — steady state, uniform properties, linear elastic material, ideal gas, incompressible flow, etc., as applicable.
Wrong assumptions invalidate the entire solution even when the formula is correct. In Work Study viva and GATE descriptive questions, listing valid assumptions often earns separate marks.
Step-by-step problem approach
1. Read the question and list given data with SI units (common in Work Study papers).
2. Draw a neat labelled diagram where applicable — examiners in Indian universities award diagram marks even when arithmetic slips.
3. Identify which relation from this topic applies to time study and standard time.
4. Use equation 1:
5. Use equation 2:
6. Substitute values, compute, and verify units and sign (direction).
7. State conclusion in one line — e.g. safe/unsafe, stable/unstable, feasible/infeasible.
2. Draw a neat labelled diagram where applicable — examiners in Indian universities award diagram marks even when arithmetic slips.
3. Identify which relation from this topic applies to time study and standard time.
4. Use equation 1:
.
5. Use equation 2:
.
6. Substitute values, compute, and verify units and sign (direction).
7. State conclusion in one line — e.g. safe/unsafe, stable/unstable, feasible/infeasible.
Applications & exam relevance
Time Study and Standard Time appears in line balancing and productivity. In Indian industrial curricula this topic is tested because it connects theory to method study and time standards.
GATE and semester exams often combine time study and standard time with earlier units — revise prerequisites before attempting mixed problems.
Industry interview panels sometimes ask: "Where did you use time study and standard time?" — answer with a lab, mini-project, or plant visit example if possible.
Common mistakes in exams
Students often confuse takt time with cycle time. Another repeated issue is using allowance percentage as A instead of A/100 in formula substitution.
Quick revision checklist
Before attempting time study and standard time problems, confirm you can:
1. Multiple cycles averaged; discard abnormal
2. Contingency allowance for minor delays
3. Standard data from MTM-1, MTM-2 databases
2. Contingency allowance for minor delays
3. Standard data from MTM-1, MTM-2 databases
Revise the solved examples in Industrial Engineering & Management — O.P. Khanna and one previous-year GATE or university paper for this unit.
Worked examples
Try the problem first — open the solution when you are ready to check.
Takt vs cycle gap
Problem
Available time is 420 min/day and customer demand is 210 units/day. Actual cycle time is 2.4 min/unit. Comment on pace.
Solution
Takt time = 420/210 = 2.0 min/unit. Since actual cycle time 2.4 > takt 2.0, the line is slower than demand and will miss daily target unless improved.
Conceptual check — Time Study and Standard Time
Problem
In a Work Study semester or GATE paper you are asked: "State the main assumption, the governing relation, and one practical consequence of time study and standard time." What should a complete answer include?
Exams & GATE
Calculate standard time with rating and allowance — typical IE exam.
📖 Standard books (India)
Industrial Engineering & Management — O.P. Khanna
Read: Syllabus unit
Work study, PPC, and OR basics
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