27 real Plant Operations questions from the Plant Operations bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is Permit to work?
Junior
A.formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
B.displacing oxygen to below about 5% before hydrocarbon introduction, and displacing hydrocarbon after shutdown before equipment is opened
C.structured written and verbal transfer of plant status, abnormal conditions, live permits and pending jobs between outgoing and incoming shifts
D.hourly record of key process parameters taken by field and panel operators, used for trend detection and shift review
2. Which term means: "formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift"?
A.Permit to work — order of leak test, inerting, utility line-up, controlled heating, feed introduction and ramp to design rate with hold points and pre-start checks
B.Permit to work — structured written and verbal transfer of plant status, abnormal conditions, live permits and pending jobs between outgoing and incoming shifts
C.Permit to work — displacing oxygen to below about 5% before hydrocarbon introduction, and displacing hydrocarbon after shutdown before equipment is opened
D.Permit to work — formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
A.positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems
B.order of leak test, inerting, utility line-up, controlled heating, feed introduction and ramp to design rate with hold points and pre-start checks
C.structured written and verbal transfer of plant status, abnormal conditions, live permits and pending jobs between outgoing and incoming shifts
D.hourly record of key process parameters taken by field and panel operators, used for trend detection and shift review
5. Which term means: "structured written and verbal transfer of plant status, abnormal conditions, live permits and pending jobs between outgoing and incoming shifts"?
A.Shift handover — order of leak test, inerting, utility line-up, controlled heating, feed introduction and ramp to design rate with hold points and pre-start checks
B.Shift handover — hourly record of key process parameters taken by field and panel operators, used for trend detection and shift review
C.Shift handover — structured written and verbal transfer of plant status, abnormal conditions, live permits and pending jobs between outgoing and incoming shifts
D.Shift handover — interlock logic that trips feed, isolates fuel and depressurises to flare on confirmed hazardous conditions, independent of the DCS
A.formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
B.positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems
C.more than ten alarms in ten minutes during an upset, which overwhelms the operator; controlled by rationalisation, dynamic suppression and first-out indication
D.approved step-by-step procedure for one operation with prerequisites, hold points, critical limits and the consequences of deviation
8. Which term means: "approved step-by-step procedure for one operation with prerequisites, hold points, critical limits and the consequences of deviation"?
A.SOP — positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems
B.SOP — approved step-by-step procedure for one operation with prerequisites, hold points, critical limits and the consequences of deviation
C.SOP — structured written and verbal transfer of plant status, abnormal conditions, live permits and pending jobs between outgoing and incoming shifts
D.SOP — formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
A.hourly record of key process parameters taken by field and panel operators, used for trend detection and shift review
B.formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
C.more than ten alarms in ten minutes during an upset, which overwhelms the operator; controlled by rationalisation, dynamic suppression and first-out indication
D.positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems
A.Log sheet — structured written and verbal transfer of plant status, abnormal conditions, live permits and pending jobs between outgoing and incoming shifts
B.Log sheet — hourly record of key process parameters taken by field and panel operators, used for trend detection and shift review
C.Log sheet — order of leak test, inerting, utility line-up, controlled heating, feed introduction and ramp to design rate with hold points and pre-start checks
D.Log sheet — approved step-by-step procedure for one operation with prerequisites, hold points, critical limits and the consequences of deviation
A.formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
B.approved step-by-step procedure for one operation with prerequisites, hold points, critical limits and the consequences of deviation
C.positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems
D.order of leak test, inerting, utility line-up, controlled heating, feed introduction and ramp to design rate with hold points and pre-start checks
14. Which term means: "order of leak test, inerting, utility line-up, controlled heating, feed introduction and ramp to design rate with hold points and pre-start checks"?
A.Start-up sequence — more than ten alarms in ten minutes during an upset, which overwhelms the operator; controlled by rationalisation, dynamic suppression and first-out indication
B.Start-up sequence — displacing oxygen to below about 5% before hydrocarbon introduction, and displacing hydrocarbon after shutdown before equipment is opened
C.Start-up sequence — order of leak test, inerting, utility line-up, controlled heating, feed introduction and ramp to design rate with hold points and pre-start checks
D.Start-up sequence — positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems
A.approved step-by-step procedure for one operation with prerequisites, hold points, critical limits and the consequences of deviation
B.more than ten alarms in ten minutes during an upset, which overwhelms the operator; controlled by rationalisation, dynamic suppression and first-out indication
C.displacing oxygen to below about 5% before hydrocarbon introduction, and displacing hydrocarbon after shutdown before equipment is opened
D.interlock logic that trips feed, isolates fuel and depressurises to flare on confirmed hazardous conditions, independent of the DCS
17. Which term means: "interlock logic that trips feed, isolates fuel and depressurises to flare on confirmed hazardous conditions, independent of the DCS"?
A.Emergency shutdown system — approved step-by-step procedure for one operation with prerequisites, hold points, critical limits and the consequences of deviation
B.Emergency shutdown system — displacing oxygen to below about 5% before hydrocarbon introduction, and displacing hydrocarbon after shutdown before equipment is opened
C.Emergency shutdown system — structured written and verbal transfer of plant status, abnormal conditions, live permits and pending jobs between outgoing and incoming shifts
D.Emergency shutdown system — interlock logic that trips feed, isolates fuel and depressurises to flare on confirmed hazardous conditions, independent of the DCS
A.order of leak test, inerting, utility line-up, controlled heating, feed introduction and ramp to design rate with hold points and pre-start checks
B.formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
C.positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems
D.displacing oxygen to below about 5% before hydrocarbon introduction, and displacing hydrocarbon after shutdown before equipment is opened
20. Which term means: "displacing oxygen to below about 5% before hydrocarbon introduction, and displacing hydrocarbon after shutdown before equipment is opened"?
A.Nitrogen purging — displacing oxygen to below about 5% before hydrocarbon introduction, and displacing hydrocarbon after shutdown before equipment is opened
B.Nitrogen purging — approved step-by-step procedure for one operation with prerequisites, hold points, critical limits and the consequences of deviation
C.Nitrogen purging — more than ten alarms in ten minutes during an upset, which overwhelms the operator; controlled by rationalisation, dynamic suppression and first-out indication
D.Nitrogen purging — formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
A.hourly record of key process parameters taken by field and panel operators, used for trend detection and shift review
B.structured written and verbal transfer of plant status, abnormal conditions, live permits and pending jobs between outgoing and incoming shifts
C.formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
D.positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems
23. Which term means: "positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems"?
A.Lock-out tag-out — order of leak test, inerting, utility line-up, controlled heating, feed introduction and ramp to design rate with hold points and pre-start checks
B.Lock-out tag-out — formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
C.Lock-out tag-out — positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems
D.Lock-out tag-out — interlock logic that trips feed, isolates fuel and depressurises to flare on confirmed hazardous conditions, independent of the DCS
A.approved step-by-step procedure for one operation with prerequisites, hold points, critical limits and the consequences of deviation
B.formal written authorisation for non-routine work such as hot work, confined space or electrical, specifying isolations, gas tests and PPE, valid for one shift
C.more than ten alarms in ten minutes during an upset, which overwhelms the operator; controlled by rationalisation, dynamic suppression and first-out indication
D.interlock logic that trips feed, isolates fuel and depressurises to flare on confirmed hazardous conditions, independent of the DCS
26. Which term means: "more than ten alarms in ten minutes during an upset, which overwhelms the operator; controlled by rationalisation, dynamic suppression and first-out indication"?
A.Alarm flood — positive isolation by double block and bleed or spectacle blind with tagged locks held by each worker before maintenance on pressurised or energised systems
B.Alarm flood — interlock logic that trips feed, isolates fuel and depressurises to flare on confirmed hazardous conditions, independent of the DCS
C.Alarm flood — more than ten alarms in ten minutes during an upset, which overwhelms the operator; controlled by rationalisation, dynamic suppression and first-out indication
D.Alarm flood — order of leak test, inerting, utility line-up, controlled heating, feed introduction and ramp to design rate with hold points and pre-start checks
Answers, AI explanations, and a free readiness check
Sign up free to check your answers with explanations, ask the AI tutor anything on any question, and take the free 2-minute readiness check for a scored result. The full AI mock interview, scored like a real panel, unlocks with Pro.