Mechanical Systems MCQs
Mechanical Systems MCQs
Try to answer these Mechanical Systems MCQs and check your understanding of the Mechanical Systems subject.
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1: Which of the following ergonomic factors are encountered in engineering applications?
A. Thermal radiations
B. Lubrication failure
C. Fatigue
D. Corrosion
2: Which of the following statements is/are true about safety/risk?
A. Risk is potential for damage
B. Hazard is likely hood of damage
C. Danger is combination of risk and hazard
D. All of the above
3: Which of the following processes is used for surface finishing?
A. Shaping
B. Broaching
C. Lapping
D. All of the above
4: In forging process, forging plane is the plane __________
A. Parallel to die motion
B. Perpendicular to die motion
C. Where two die halves meet
D. None of the above
5: What are the factors affecting selection of casting process?
A. Tolerances
B. Surface finish
C. Both a. and b.
D. None of the above
6: Which of the following is a property of bulk load?
A. Hardness
B. Cake forming tendency
C. Suspension part
D. Weight
7: Which of the following is not a hoisting equipment with lifting gear?
A. Cage elevators
B. Jib cranes
C. Pulleys
D. Troughed belts
8: What are bulk loads?
A. Lump of material
B. Single rigid mass
C. Homogeneous particles
D. Heterogeneous particles
9: Which belt conveyor prevents sliding down of material at an inclination of 55o with horizontal?
A. Flat belt conveyor
B. Troughed belt conveyor
C. Blanket belt conveyor
D. Woven wire belt conveyors
10: Diameter range is high in geometric progression due to _________ spindle speed.
A. Low
B. High
C. Constant
D. None of the above
11: What is harmonic progression?
A. Difference between reciprocal of two successive spindle speeds is constant
B. Difference between two successive spindle speeds is constant
C. Ratio of two successive spindle speeds is constant.
D. Ratio of two successive spindle speeds is variable.
12: Ratio of two spindle speeds is constant in _________ progression.
A. Arithmetic
B. Geometric
C. Harmonic
D. None of the above
13: What is the purpose of using a gear box?
A. To increase torque
B. To increase speed
C. Converts single input speed into multiple output speeds
D. All of the above
14: Which of the following statements is true for structure/speed diagrams?
A. Structure diagrams gives range ratio of spindle speeds
B. Speed diagrams do not give range ratio of spindle speeds
C. Speed diagrams consider motor speed
D. All of the above
15: What causes infant mortality in mechanical equipments?
A. Design errors
B. Manufacturing defects
C. Installation defects
D. All of the above
16: A plain carbon steel has mean yield strength of 300 N/mm2 and standard deviation of 50 N/mm2. What is the mean and standard deviation of margin of safety, if mean tensile stress of 250 N/mm2 and standard deviation of 65 N/mm2 acts on it?
A. 23.45 N/mm2, 50 N/mm2
B. 50 N/mm2, 82 N/mm2
C. 82 N/mm2, 7.07 N/mm2
D. 7.07 N/mm2, 50 N/mm2
17: What is meant by mean time to failure (MTTF)?
A. Mean time between two successive failure components
B. Maximum time between two successive failure components
C. Sum of survival time for number of components divided by number of failures
D. Sum of number of failures divided by survival time for number of components
18: If a relief valve has reliability of 0.989, how many failures are expected in testing 1000 such relief valves?
A. 111
B. 100
C. 10
D. 11
19: Failure rate for safety valve working for 400 hours is 3 x 10–6 failures/hour. What is the reliability of safety valve?
A. 0.998
B. 0.989
C. 0.888
D. 0.899
20: What will be the transfer function of a body of mass M, in which input quantity is force and output quantity is displacement?
A. SM
B. S2M
C. 1/sM
D. 1/( s2 M)
21: Mass and Moment of inertia are equivalent quantities.
A. True
B. False
22: Linear and torsional springs are used to provide ________________ and __________________
A. Restoring force and torque respectively
B. Restoring torque and force respectively
C. Restoring torque only
D. None of the mentioned
23: Restoring force of a spring under stress is F(s) = ____________
A. X(s)
B. KX(s)
C. K
D. None of the mentioned
24: Spring is a ___________ order system.
A. Zero
B. First
C. Second
D. Third
25: Name the Friction which acts till the body starts moving?
A. Dynamic friction
B. Static friction
C. Viscous friction
D. None of the mentioned
26: What will you call the friction between a relative motion of two bodies?
A. Static friction
B. Dynamic friction
C. Viscous friction
D. None of the mentioned
27: What is the equivalent quantity of capacitance in the transfer function of the viscous force?
A. Viscous force
B. Viscosity
C. Damping coefficient
D. Inertia
28: Transfer function of force acting on a body is given as 1/(s2 M). What will be the transfer function of a rotating body?
A. 1/(s2 j)
B. 1/j
C. 1/sM
D. None of the mentioned
29: 20N force is acting on a 5Kg body. What will be its rate of change of velocity?
A. 4m/s2
B. 5m/s2
C. 10m/s2
D. 2m/s2
30: Tacho generators are ______________
A. Zero-order system
B. First-order system
C. Second order system
D. None of the mentioned
31: Current to force and current to torque conversion is possible only for a constant current source.
A. True
B. False
32: Which of the following represents transfer function of tacho-generators?
A. Kg
B. 1/Kg
C. SKg
D. S2Kg
33: Transfer function of force motor is _____________
A. Kg
B. SKg
C. Kf
D. SKf
34: Most electrical indicating instruments are electromechanical systems since ________________
A. They are used to measure electric component
B. They are more precise
C. They require no external power to operate
D. They convert electrical quantity to mechanical quantity
35: Torque developed by a DC motor will be proportional to armature current.
A. True
B. False
36: Which of the following is the correct conversion in an electro mechanical system?
A. Electrical to electrical
B. Electrical to mechanical
C. Mechanical to electrical
D. Both electrical to mechanical and mechanical to electrical
37: For a constant field dc motor, what is the relation between the mechanical time constant and armature resistance?
A. Direct proportionality
B. Inverse proportionality
C. Double
D. Equal
38: Which of the following represents for torque speed characteristic for dc motor?
A. Positive slope
B. Negative slope
C. Slope zero
D. None of the mentioned
39: What is the relation between eddy current damping coefficient and resistance in PMMC device?
A. Direct proportionality
B. Inverse proportionality
C. Constant
D. None of the mentioned
40: What we call the resistance of a material against any external force.
A. Malleability
B. Stiffness
C. Hardness
D. Strength
41: Which hardness test uses the steel ball as indenter?
A. Rockwell C hardness test
B. Brinell Hardness test
C. Rockwell B hardness test
D. Vickers hardness test
42: In which test, the specimen will be used in the form of the supported beam?
A. Charpy Test
B. Brinell Test
C. Izod test
D. Rockwell hardness test
43: Which metal from the following has the non-crystalline structure?
A. Quartz
B. Silica Glass
C. Tungsten
D. Iron
44: Which of the following has less crystallinity?
A. Nickel
B. Iron
C. Low-density polythene
D. High-density polythene
45: Which of the following axis system is being satisfied by tetragonal crystal system?
A. A ≠b ≠c, α = β = ϒ = 90°
B. A = b ≠c, α = β = ϒ = 90°
C. A = b = c, α ≠β = ϒ = 90°
D. A = b = c, α = β = ϒ = 90°
46: Which one of the following is least symmetrical?
A. Simple Cubic
B. Triclinic
C. Monoclinic
D. Tetragonal
47: ASTM stands for?
A. American Society for Testing and Materials
B. American Society for Tool Measurement
C. American Society for Tensile Material
D. American Society for Tensile Measurement
48: What is the scale range of the Mohs hardness test?
A. 1 - 10
B. 1 - 1000
C. 100 - 200
D. 1 - 3000
49: What is the first step involved in the process of preparing test samples for microstructural examination?
A. Fine grinding
B. Rough polishing
C. Etching
D. Fine polishing
50: Etching of specimen is done to achieve _______
A. Invisible grain boundary
B. Visible grain boundary
C. Hardness
D. Toughness
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