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Dangote Refinery Past Questions And Answers – 2024 Updated
Dangote Refinery Past Questions And Answers – 2024 Updated. This study pack comprise of Updated Dangote refinery past questions and answers, including extensive practice questions to put you in top shape for higher score at the test.
To perform well in this test, you must score higher than most candidates to pool among the selected candidates for the interview stages and eventual employment offer.
About Dangote Refinery Test.
Dangote refinery test usually comprise of 2 sections and it is typically GATE standard.
- SECTION 1: General Aptitude test (100 questions)
- SECTION 2: Technical / Course specific test (120 questions – answer any 100)
Free Sample of Dangote Refinery Past Questions And Answers
MECHANICAL ENGINEERING
1. A reed type tachometer use the principle of
A. Longitudinal vibration
B. Torsional vibration
C. Transverse vibration
D. Damped free vibration
Answer: Option C
2.The lower pairs are _________ pairs.
A. Self-closed
B. Force-closed
C. Friction closed
D. None of these
Answer: Option A
3. In a coupling rod of a locomotive, each of the four pairs is a ________ pair.
A. Sliding
B. Turning
C. Rolling
D. Screw
Answer: Option C
Solution:
A coupling rod in a locomotive is a crucial component that connects the driving wheels of the locomotive. It plays a vital role in transmitting motion from the piston to the wheels. The question is asking about the type of pair formed by each connection between the coupling rod and the driving wheel.
A coupling rod forms a rolling pair with the driving wheel. In a rolling pair, the relative motion between the components involves pure rolling, where one component rolls over the surface of the other without any sliding or slipping. This is an essential characteristic for efficient power transmission and reduced wear and tear in locomotives.
While the locomotive is in operation, the coupling rod experiences complex motion due to the varying forces and angles involved. However, the primary mode of relative motion between the coupling rod and the driving wheel is rolling, which ensures smoother operation and improved efficiency of the locomotive’s power transmission system.
4. A kinematic chain is known as a mechanism when
A. None of the links is fixed
B. One of the links is fixed
C. Two of the links are fixed
D. None of these
Answer: Option B
Solution:
A kinematic chain is a combination of links connected in a specific order, allowing relative motion between them. When one of the links in a kinematic chain is fixed or stationary, it is termed a mechanism. This fixed link provides a frame of reference against which the motions of other links are observed. The fixed link is often referred to as the “ground” or “frame” link, and it serves as a foundation for the movement and analysis of the remaining links in the kinematic chain.
By fixing a single link, the entire kinematic chain becomes a functional system with controlled or constrained motion. This is a fundamental concept in the study of mechanisms, which are essential components in various mechanical devices and machines used in engineering applications.
Note: Options A and C are not accurate because the presence of fixed links is essential to define a mechanism. Option D is also not correct as one of the options (Option B) is indeed the correct condition for a kinematic chain to be termed a mechanism.
5. A pantograph is a mechanism with
A. Lower pairs
B. Higher pairs
C. Rolling pairs
D. Turning pairs
Answer: Option A
6. A ball and a socket forms a
A. Turning pair
B. Rolling pair
C. Screw pair
D. Spherical pair
Answer: Option D
7. In a gear having involute teeth, the normal to the involute is a tangent to the
A. Pitch circle
B. Base circle
C. Addendum circle
D. Dedendum circle
Answer: Option B
8. A mechanism is an assemblage of
A. Two links
B. Three links
C. Four or more than four links
D. All of these
Answer: Option C
9. Which of the following statement is correct as regard to the difference between a machine and a structure?
A. The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another
B. The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only
C. A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
D. All of the above
Answer: Option D
10. In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is
A. 95 mm
B. Slightly less than 95 mm
C. Slightly more than 95 mm
D.45 mm
Answer: Option B
ELECTRICAL ENGINEERING
Question1: On which of the following factors does the resistivity of a material depend ?
A. Resistance of the conductor
B. Area of the conductor section
C. Length of the conductor
D. All of the above
Answer: Option D
Question2: Piezoelectric materials serve as a source of ________ .
A. Resonant waves
B. Musical waves
C. Microwaves
D. Ultrasonic waves
Answer: Option D
Question3: The tiny block formed by the arrangement of a small group of atoms is called the
A. Unit cell
B. Space lattice
C. Either A or B
D. None of the above
Answer: Option A
Question4: The number of atoms per unit cell in B.C.C. structure is
A. 1
B. 2
C. 4
D. 8
Answer: Option B
Question 5: Which of the following variety of copper has the best conductivity ?
A. Induction hardened copper
B. Hard drawn copper
C. Pure annealed copper
D. Copper containing traces of silicon
Answer: Option C
Question 6:The kinetic energy of a bounded electron is
A. Less than that of unbounded electron
B. Greater than that of unbounded electron
C. Equal to that of unbounded electron
D. Infinite
Answer: Option A
Question7: Super conductivity can be destroyed by
A. Adding impurities
B. Reducing temperatures
C. Application of magnetic field
D. Any of the above
Answer: Option C
Question 8: The conductivity of a conductor can be increased by
A. Decreasing its temperature
B. Increasing its temperature
C. Decreasing its vibration
D. Increasing its vibration
Answer: Option A
Question 9: Mercury as an electric contact material is
A. A liquid
B. A metal
C. A metal liquid
D. A gas
Answer: Option C
Question10: ________ has the best damping properties.
A. Diamond
B. High speed steel
C. Mild steel
D. Cast iron
Answer: Option D
CIVIL ENGINEERING
1. A simply supported beam A carries a point load at its mid span. Another identical beam B carries the same load but uniformly distributed over the entire span. The ratio of the maximum deflections of the beams A and B, will be
A. 2323
B. 3232
C. 5858
D. 8585
Answer: Option D
Solution:
Deflection max (A)=PL348EIDeflection max (B)=5wL4384EI;(w=PL)=5PL3384EIRatio=PL348EI×384EI5PL3=85Deflection max (A)=PL348E�Deflection max (B)=5wL4384E�;(w=PL)=5PL3384E�Ratio=PL348E�×384E�5PL3=85
2. Principal planes are subjected to
A. Normal stresses only
B. Tangential stresses only
C. Normal stresses as well as tangential stresses
D. None of these
Answer: Option A
3. Y are the bending moment, moment of inertia, radius of curvature, modulus of If M, I, R, E, F and elasticity stress and the depth of the neutral axis at section, then
A. MI=RE=FYMI=RE=FY
B. IM=RE=FYIM=RE=FY
C. MI=ER=FYMI=ER=FY
D. MI=ER=YFMI=ER=YF
Answer: Option C
4. A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is
A. MTMT
B. TMTM
C. 2MT2MT
D. 2TM2TM
Answer: Option C
5. A masonry dam (density = 20,000 N/m3) 6 m high, one metre wide at the top and 4 m wide at the base, has vertical water face. The minimum stress at the base of the dam when the reservoir is full, will be
A.75 N/m2
B.750 N/m2
C.7,500 N/m2
D.75,000 N/m2
Answer: Option C
6.The ratio of the maximum deflections of a simply supported beam with a central load W and of a cantilever of same length and with a load W at its free end, is
A.1818
B.110110
C.112112
D.116116
Answer: Option D
7.The ratio of the length and depth of a simply supported rectangular beam which experiences maximum bending stress equal to tensile stress, due to same load at its mid span, is
A1212
B. 2323
C.1414
D. 1313
Answer: Option B
8.The ratio of the length and diameter of a simply supported uniform circular beam which experiences maximum bending stress equal to tensile stress due to same load at its mid span, is
A.1818
B.1414
C.1212
D.1313
Answer: Option C
9. A simply supported beam A carries a point load at its mid span. Another identical beam B carries the same load but uniformly distributed over the entire span. The ratio of the maximum deflections of the beams A and B, will be
A. 2323
B. 3232
C. 5858
D. 8585
Answer: Option D
10.A three hinged arch is generally hinged at its supports and
A. At one quarter span
B. At the crown
C. Anywhere in the rib
D. None of these
Answer: Option B
Solution:
A three-hinged arch is a structural form used in civil engineering to efficiently distribute loads and resist bending moments. It consists of three hinges, which allow rotation at the supports to accommodate the arch’s deformation under load. The three hinges are located at the supports and at the crown of the arch.
The crown of an arch refers to the highest point along the arch’s curve, where the arch is subjected to compressive forces. Placing a hinge at the crown allows the arch to rotate and adapt to changes in loading and deformation. This rotational flexibility is crucial for the arch’s stability and ability to carry loads without excessive stress.
Note: Options A, C, and D are not accurate descriptions of the typical hinge locations in a three-hinged arch. The correct configuration involves hinges at the supports and at the crown to ensure proper load distribution and structural performance.
CHEMICAL ENGINEERING
1. What is the unit of specific gravity?
A. Dimensionless
B. m/s2
C. N/m3
D. Kg/m3
Answer: a
Explanation: Specific gravity of a substance is the ratio of density of the substance and density of a reference substance, so it is dimensionless.
2. Which of the following has the same number of moles as in 398 grams of CuSO4?
A. 35 grams of nitrogen
B. 58.5 grams of Sodium chloride
C. 2 grams of hydrogen
D. 40 grams of oxygen
Answer: d
Explanation: Number of moles of CuSO4 = 398/ 159 ≈ 2.5, and number of moles of oxygen = 40/16 = 2.5.
3. What is the specific gravity of 5 Kg of water occupied in 10 m3 with respect to 500 g/m3?
A. 2
B. 5
C. 0.5
D. 1
Answer: d
Explanation: Specific gravity = (5/10)/0.5 = 1.
4. What is the unit of mole fraction?
a) N/m3
b) m-2
c) Kg/m3
d) None of the mentioned
Answer: d
Explanation: Since the mole fraction is ratio of the moles of solute and the moles of solution, it has no unit.
5. What is the weight of 10 moles of a mixture with composition 15% O2, 25% SO2, 30% COCl2, 25% SO3 and 5% N2?
A. 564
B. 475
C. 867
D.719
Answer: d
Explanation: Molecular weight of mixture = (15*32 + 25*64 + 30*99 + 25*80 + 5*28)/100 = 71.9, => Weight of mixture = 71.9*10 = 719.
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6. What is the 100oC in degree Fahrenheit?
A. 100oF
B. 212oF
C. 460oF
D. 0oF
Answer: b
Explanation: Temperature = 9(100)/5 + 32 = 212oF.
7. What is the pressure of 1900 Torr in the bar?
A.2.46
B. 2.87
C. 2.40
D. 2.68
Answer: c
Explanation: Pressure = 1900/760*100000/101325 = 2.4 bar.
8. Which of the following is not a pressure measuring device?
A. Galvanometer
B. Manometer
C. Barometer
D. None of the mentioned
Answer: a
Explanation: Galvanometer is used to measure current.
9. Which of the following is used for the pressure measurement of only liquid?
A. Differential Manometer
B. Manometer
C. Piezometer
D. None of the mentioned
Answer: c
Explanation: Piezometer is a pressure measuring device used to measure the pressure of liquid only.
10. Which of the following is a state function?
A. Entropy
B. Heat
C. Work
D. None of the mentioned
Answer: a
Explanation: Entropy is a state function as it does not depend on the path of the process.
How the test is scored:
The exam is highly competitive and there is no specific cut off marks. Selection is based on the general performance of all candidates in the test.
Each question carries 1/2 point. Unlike most job aptitude tests, more emphasis is on accuracy as there is no particular score for speed.
Some Frequently Asked Questions About Dangote Refinery Aptitude Test 2024
Q: Can I take the test on my phone?
A: We strongly advise against using your phone for the test. Using your phone can result in your test
being terminated when calls or SMS come in during the test as this can be considered suspicious
activities (see the question on suspicious activities for more details).
Q: Can I take the test more than once?
A: You are only allowed to take the test only once. If you take the test more than once, it is only your
score from the first attempt that will be recorded.
Q: Is the test timed?
A: Yes. All tests have a time duration in which they must be completed. Once the duration is
reached, the test will be terminated, and your score recorded and submitted.
Q: What if I mistakenly end the test before I am done?
A: Once a test is submitted or closed, it will be assumed that the test has been completed and
submitted.
Q: Would I be allowed to retake the test if my test automatically ended because of network or
internet issues?
A: No, you would not be allowed to retake the test. You are advised to make sure you have quality
internet service to avoid this.
Q: Would I be allowed to use the calculator on my system for the test for mathematical questions?
A: Opening another app on your device while taking the test is considered an unusual behaviour so
we advise you have a physical calculator for the test.
Q: My test just ended. I don’t know what happened. What should I do?
A: Your test can be terminated for several reasons – internet connection, suspicious behaviour, or test
time elapsed.
Please ensure you have good and reliable internet before starting the examination to prevent
termination due to poor internet connection.
If you perform five (5) suspicious activities, your test will be terminated. Every time a suspicious
activity is noticed, you will get a warning. By the fifth (5th) warning, your test will be terminated.
Q: What are suspicious activities?
A: Your test will be terminated if you perform five (5) suspicious activities. The following activities are
considered suspicious activities /unusual behaviour:
˗ Minimizing the browser.
˗ Resizing the browser.
˗ Opening a new tab.
˗ Opening a new program.
˗ Take a screenshot. (Desktop)
˗ Pressing Ctrl + C.
˗ Pressing Ctrl + V.
˗ Pressing Print Screen.
˗ Pressing F12.
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