Previous year questions · CIL (Coal India Limited)

CIL (Coal India Limited) Domain Knowledge — Previous Year Questions

250 Domain Knowledge questions asked in past CIL (Coal India Limited) papers, split into 25 timed practice sets — every question with its answer and explanation.

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About CIL (Coal India Limited) Domain Knowledge previous year questions

This page collects every Domain Knowledge question that has appeared in past CIL (Coal India Limited) papers on AajExam — 250 questions in total, organised into 25 short, timed practice sets. Each question is shown with its four options, the correct answer, and an explanation of the reasoning, so you can use the page either as a self-test or as a revision reference. Why previous year questions are the highest-value Domain Knowledge preparation you can do for CIL (Coal India Limited): recruitment boards reuse a stable pool of concepts across cycles. The wording changes, the underlying idea rarely does. Working through a few hundred genuine past Domain Knowledge questions teaches you which sub-topics the paper actually rewards, how the examiner likes to frame distractors, and roughly how long each question type should take — none of which a syllabus document can tell you. How to use this page: attempt questions in blocks of ten without looking at the answers, then review every question you got wrong or guessed. Read the explanation for the concept, not just the answer letter. When a concept keeps catching you out, open the related topic page linked below and drill that single area before returning here. Repeat across the full bank, and track how your accuracy on the second pass compares with your first — a 15-20% improvement is normal and is the clearest sign your preparation is working. What is in this bank: the questions are transcribed from actual CIL (Coal India Limited) question papers, kept in the original order and wording, with solutions written by subject specialists. Sets are free to attempt, work on mobile, and need no login to read. If you would rather practise a complete paper end to end under exam conditions, the full CIL (Coal India Limited) previous-year papers are linked below as well.

Domain Knowledge PYQs asked in CIL (Coal India Limited)

A sample of 30 questions from the full bank of 250. Try each one before opening the solution — the remaining questions are in the timed practice sets below.

Q1.A control system that measures certain output process variables and uses these to control speed and feed is called:
- A.in-process control
- B.operator control
- C.adaptive control
- D.feed-back control
Show answer
Answer: D. feed-back control
Q2.Friction factor for laminar flow in a pipe is given by:
- A.
- B.
- C.
- D.
Show answer
Answer: B.
Q3.The vibration of a revolving shaft, at its nodal point is:
- A.Double than at the ends
- B.Maximum
- C.Zero
- D.Minimum
Show answer
Answer: D. Minimum
Q4.A Wheatstone bridge is used for electrical strain gauges, because it has:
- A.high sensitivity
- B.low sensitivity
- C.zero sensitivity
- D.infinite sensitivity
Show answer
Answer: C. zero sensitivity
Q5.An imaginary circle on a gear which gives a rolling action, as same as the motion as the actual gear, is called:
- A.Pitch circle
- B.Addendum circle
- C.Clearance circle
- D.Dedendum circle
Show answer
Answer: A. Pitch circle
Q6.Two cubical castings of the same metal and sizes of 2 cm side and 4 cm side are moulded in green sand. If the smaller casting solidifies in 2 mins, the expected time of solidification of larger casting will be:
- A.4 mins
- B.2 mins
- C.16 mins
- D.8 mins
Show answer
Answer: A. 4 mins
Q7.In a locomotive, the effect of “hammer blow” can be reduced by:
- A.decreasing the speed and having pairs of wheels coupled together
- B.uncoupling the pairs of wheels
- C.increasing the speed
- D.balancing whole of the reciprocating parts
Show answer
Answer: A. decreasing the speed and having pairs of wheels coupled together
Q8.
- A.
- B.
- C.
- D.
Show answer
Answer: A.
Q9.Ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is:
- A.overall efficiency
- B.net efficiency
- C.indicated efficiency
- D.relative efficiency
Show answer
Answer: D. relative efficiency
Q10.In chemical machining, the etch factor is expressed as:
- A.Undercut/depth of cut
- B.tool wear/ Workpiece wear
- C.Workpiece wear/tool wear
- D.Depth of cut/ Undercut
Show answer
Answer: A. Undercut/depth of cut
Q11.A computer uses RAM chips of 1024 x 1 capacity. How many chips are needed to provide memory capacity of 16K bytes?
- A.8
- B.1024
- C.16
- D.128
Show answer
Answer: D. 128
Q12.Number of states in DFA accepting the following language is: L = { an b2m | n, m ≥ 1 }
- A.m
- B.n
- C.5
- D.2
Show answer
Answer: A. m
Q13.Which of the following has lowest access time?
- A.Main Memory
- B.Optical disk
- C.Cache
- D.Registers
Show answer
Answer: A. Main Memory
Q14.Which of the following is / are correct A language is context free if and only if it is accepted by PDA PDA is a finite automata with push down stack
- A.Only II is true
- B.Both I and II are false
- C.Both I and II are true
- D.Only I is true
Show answer
Answer: C. Both I and II are true
Q15.With respect to deque which of the following is true?
- A.Insertion is done only from front end
- B.Insertion and deletion can be done at front and rear ends
- C.Deletion is done only from rear end
- D.Insertion is done only from rear end
Show answer
Answer: B. Insertion and deletion can be done at front and rear ends
Q16.A negative edge triggered flip flop transfers data from input to output on the:
- A.LOW to HIGH transition of clock pulse
- B.BEFORE transition of clock pulse
- C.HIGH to LOW transition of clock pulse
- D.WITHOUT transition of clock pulse
Show answer
Answer: D. WITHOUT transition of clock pulse
Q17.What is the complexity of Merge Sort?
- A.O(n)
- B.O(n2 log n)
- C.O(n log n)
- D.O(n2)
Show answer
Answer: C. O(n log n)
Q18.of graph is a vertex whose removal disconnects graph.
- A.Start vertex
- B.Middle point
- C.Terminal Vertex
- D.Articulation point / Cut vertex
Show answer
Answer: A. Start vertex
Q19.Canonical SOP form of logic expression consists of only _.
- A.Maxterms
- B.Laterals
- C.Cell
- D.Minterms
Show answer
Answer: D. Minterms
Q20.The following grammar is: S Aa | b A c | dc | bda A a
- A.Neither LALR(1) nor SLR(1)
- B.LALR(1) but not SLR(1)
- C.Not LALR(1) but SLR(1)
- D.LALR(1) and SLR(1)
Show answer
Answer: A. Neither LALR(1) nor SLR(1)
Q21.MSB stands for:
- A.Middle significant bit
- B.Measured significant bit
- C.Maximum significant bit
- D.Most significant bit
Show answer
Answer: C. Maximum significant bit
Q22.Which scheduling algorithm gives a minimum average waiting time?
- A.RR
- B.Priority
- C.SJF
- D.FCFS
Show answer
Answer: B. Priority
Q23.Consider the following statements Insertion Sort and Merge Sort are stable. Heap Sort is inherently unstable. Selection Sort is not inherently stable, but may be coded in such a way that it is stable
- A.Only statement 1 is correct
- B.All statements are correct
- C.Statement 3 is not correct
- D.Only statement 1 and 2 is correct
Show answer
Answer: A. Only statement 1 is correct
Q24.Which of the following statement is false?
- A.Every regular language is also a context free language
- B.Every non deterministic Turing machine can be converted to an equivalent deterministic Turing machine
- C.Every subset of recursively enumerable set is recursive.
- D.Every NFA can be converted into equivalent DFA
Show answer
Answer: A. Every regular language is also a context free language
Q25.A Tuple Relational Calculus query is expressed as _.
- A.{ T | p(T) }
- B.{ P( ) | T)
- C.{ p(T) | T }
- D.{ T | P() | T}
Show answer
Answer: A. { T | p(T) }
Q26.Consider the grammar S AbBaCc | ε aAb | ba bBC | cb cCa |ac Find the First ( ) of S
- A.{a ,b, ε}
- B.{ε}
- C.{a,ε}
- D.{a ,b, c, ε}
Show answer
Answer: D. {a ,b, c, ε}
Q27.Calculate the link utilization (throughput) for stop and wait flow control mechanism if the frame size is 4800 bits, bit rate is 9600 bps, and distance between the devices is 2000 km. Given propagation speed is 200000 km/s.
- A.0.92
- B.0.82
- C.0.96
- D.0.86
Show answer
Answer: D. 0.86
Q28.Which is the correct method to obtained 10’s compliment of a decimal number?
- A.The minuend is added to the 10’s complement of the subtrahend and carry is dropped
- B.The 10’s complement of a decimal number is equal to 9’s complement of given number minus one
- C.The subtrahend is added to the 10’s complement of the minuend and carry is dropped
- D.The 10’s complement of a decimal number is equal to 9’s complement of given number plus one
Show answer
Answer: A. The minuend is added to the 10’s complement of the subtrahend and carry is dropped
Q29.Maximum throughput of slotted ALOHA network is:
- A.18.4%
- B.36.8%
- C.50%
- D.35.8%
Show answer
Answer: C. 50%
Q30.Which one of the following is True?
- A.Every regular grammar is LL (1) and every regular set does not have-an LR (1) grammar
- B.Every regular grammar is not LL (1) and every regular set does not have-an LR (1) grammar
- C.Every regular grammar is LL (1) and every regular has an LR (1) grammar
- D.Every regular grammar is not LL (1) and every regular set has an LR (1) grammar
Show answer
Answer: A. Every regular grammar is LL (1) and every regular set does not have-an LR (1) grammar

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CIL (Coal India Limited) syllabus & pattern Full CIL (Coal India Limited) question papers All Domain Knowledge practice

Frequently Asked Questions

How many CIL (Coal India Limited) Domain Knowledge previous year questions are available?

250 Domain Knowledge questions from past CIL (Coal India Limited) papers are available on AajExam, split into 25 practice sets. New questions are added as fresh papers are released.

Are the answers and explanations free?

Yes. Every question on this page shows its correct answer and explanation free of charge, and you do not need an account to read them. A free account only adds attempt tracking and performance analytics.

Do CIL (Coal India Limited) repeat questions from previous years?

Exact repeats do occur, but the more reliable pattern is conceptual: the same Domain Knowledge sub-topics reappear cycle after cycle with reworded questions. That is why working through past questions raises your score more reliably than reading theory alone.

How should I use these questions in my CIL (Coal India Limited) preparation?

Attempt a set of ten cold, review every wrong and guessed question with its explanation, then drill the weak sub-topic on its topic page before moving on. Revisit the same set after a few days — your second-attempt accuracy is the honest measure of whether the concept stuck.

CIL (Coal India Limited) Domain Knowledge practice sets

Each set is a timed 10-question drill drawn from the same question bank.

About CIL (Coal India Limited) Domain Knowledge previous year questions

Domain Knowledge PYQs asked in CIL (Coal India Limited)

Q1.A control system that measures certain output process variables and uses these to control speed and feed is called:

Q2.Friction factor for laminar flow in a pipe is given by:

Q3.The vibration of a revolving shaft, at its nodal point is:

Q4.A Wheatstone bridge is used for electrical strain gauges, because it has:

Q5.An imaginary circle on a gear which gives a rolling action, as same as the motion as the actual gear, is called:

Q6.Two cubical castings of the same metal and sizes of 2 cm side and 4 cm side are moulded in green sand. If the smaller casting solidifies in 2 mins, the expected time of solidification of larger casting will be:

Q7.In a locomotive, the effect of “hammer blow” can be reduced by:

Q8.

Q9.Ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is:

Q10.In chemical machining, the etch factor is expressed as:

Q11.A computer uses RAM chips of 1024 x 1 capacity. How many chips are needed to provide memory capacity of 16K bytes?

Q12.Number of states in DFA accepting the following language is: L = { an b2m | n, m ≥ 1 }

Q13.Which of the following has lowest access time?

Q14.Which of the following is / are correct A language is context free if and only if it is accepted by PDA PDA is a finite automata with push down stack

Q15.With respect to deque which of the following is true?

Q16.A negative edge triggered flip flop transfers data from input to output on the:

Q17.What is the complexity of Merge Sort?

Q18.of graph is a vertex whose removal disconnects graph.

Q19.Canonical SOP form of logic expression consists of only _.

Q20.The following grammar is: S Aa | b A c | dc | bda A a

Q21.MSB stands for:

Q22.Which scheduling algorithm gives a minimum average waiting time?

Q23.Consider the following statements Insertion Sort and Merge Sort are stable. Heap Sort is inherently unstable. Selection Sort is not inherently stable, but may be coded in such a way that it is stable

Q24.Which of the following statement is false?

Q25.A Tuple Relational Calculus query is expressed as _.

Q26.Consider the grammar S AbBaCc | ε aAb | ba bBC | cb cCa |ac Find the First ( ) of S

Q27.Calculate the link utilization (throughput) for stop and wait flow control mechanism if the frame size is 4800 bits, bit rate is 9600 bps, and distance between the devices is 2000 km. Given propagation speed is 200000 km/s.

Q28.Which is the correct method to obtained 10’s compliment of a decimal number?

Q29.Maximum throughput of slotted ALOHA network is:

Q30.Which one of the following is True?

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