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Objective Questions

Latest UPSSSC Junior Engineer Mechanical Exam Question (Objective Questions), MCQ in English

Subjects : Theory of Machines and Machine Design, Engineering Mechanics, Strength of Materials, Thermodynamics, Internal Combustion (I.C.) Engine, Steam Engineering and Power Plant Engineering, Refrigeration and Air Compression, Fluid Mechanics and Hydraulic Machine, Knowledge of concepts of Computer and Information Technology and contemporary technological development and innovation in this field, General information related to the state of Uttar Pradesh

Question Bank UPSSSC Junior Engineer (Mechanical) Exam - English
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Theory of Machines and Machine Design

Question 1Single Answer
The mechanical advantage of an ideal machine is numerically equal to which quantity?
  1. A
    Input work divided by output work
  2. B
    Frictional resistance
  3. C
    Efficiency expressed as a percentage
  4. D
    Velocity ratio
Question 2Single Answer
A lifting machine is reversible when its efficiency is generally greater than which value?
  1. A
    25%
  2. B
    50%
  3. C
    75%
  4. D
    40%
Question 3Single Answer
The law of a lifting machine is expressed as P = mW + C. What does C represent?
  1. A
    Output work per cycle
  2. B
    Maximum permissible load
  3. C
    Velocity ratio of the machine
  4. D
    Effort required to overcome machine friction at zero load
Question 4Single Answer
In an ideal differential wheel and axle, the velocity ratio depends primarily on which parameters?
  1. A
    Wheel radius and difference between axle radii
  2. B
    Coefficient of friction and drum width
  3. C
    Applied effort and lifted load
  4. D
    Rope tension and machine efficiency
Question 5Single Answer
Which condition characterizes a self-locking lifting machine?
  1. A
    Load descends automatically without effort
  2. B
    Mechanical advantage becomes zero
  3. C
    Load cannot descend without external effort
  4. D
    Velocity ratio becomes unity
Question 6Single Answer
The maximum efficiency of a lifting machine governed by P = mW + C approaches which expression as the load becomes very large?
  1. A
    VR/m
  2. B
    m/VR
  3. C
    C/m
  4. D
    1/(m ร— VR)
Question 7Single Answer
What is the velocity ratio of a single fixed pulley under ideal conditions?
  1. A
    1
  2. B
    2
  3. C
    3
  4. D
    4
Question 8Single Answer
In a simple wheel and axle, doubling the wheel radius while retaining the axle radius causes the velocity ratio to?
  1. A
    Become half
  2. B
    Remain constant
  3. C
    Become four times
  4. D
    Become twice
Question 9Single Answer
Which quantity is defined as the ratio of load lifted to effort applied?
  1. A
    Mechanical advantage
  2. B
    Machine efficiency
  3. C
    Velocity ratio
  4. D
    Friction factor
Question 10Single Answer
The efficiency of a machine is determined from which relationship?
  1. A
    MA/VR
  2. B
    VR/MA
  3. C
    MA + VR
  4. D
    MA ร— VR
Question 11Single Answer
A machine has a mechanical advantage of 6 and a velocity ratio of 8. Its efficiency equals?
  1. A
    48%
  2. B
    60%
  3. C
    80%
  4. D
    75%
Question 12Single Answer
Which statement is true for the efficiency of a real machine?
  1. A
    It is always greater than unity
  2. B
    It is independent of friction
  3. C
    It is generally less than 100%
  4. D
    It is always equal to its velocity ratio
Question 13Single Answer
A screw jack converts which type of motion into lifting motion?
  1. A
    Reciprocating into oscillating
  2. B
    Linear into rotary
  3. C
    Rotary into translational
  4. D
    Oscillating into reciprocating
Question 14Single Answer
The velocity ratio of an ideal screw jack with handle radius R and screw pitch p is?
  1. A
    p/(2ฯ€R)
  2. B
    2ฯ€R/p
  3. C
    2R/p
  4. D
    R/p
Question 15Single Answer
Which mechanism normally produces intermittent rather than continuous output motion?
  1. A
    Oldham coupling
  2. B
    Belt drive
  3. C
    Simple gear pair
  4. D
    Geneva mechanism

Engineering Mechanics

Question 16Single Answer
Which condition is necessary for the equilibrium of a coplanar concurrent force system?
  1. A
    Sum of horizontal forces is zero only
  2. B
    Sum of vertical forces is zero only
  3. C
    Both horizontal and vertical force sums are zero
  4. D
    Algebraic sum of moments is nonzero
Question 17Single Answer
A force is completely specified by which combination?
  1. A
    Magnitude, direction and line of action
  2. B
    Magnitude and mass only
  3. C
    Velocity and acceleration
  4. D
    Pressure and displacement
Question 18Single Answer
The principle of transmissibility of forces applies primarily to?
  1. A
    Deformable bodies under local stress analysis
  2. B
    Compressible fluids only
  3. C
    External effects on rigid bodies
  4. D
    Thermal expansion problems
Question 19Single Answer
Two equal forces of magnitude P act at an angle of 120 degrees. Their resultant magnitude is?
  1. A
    2P
  2. B
    โˆš3P
  3. C
    P
  4. D
    P/2
Question 20Single Answer
Which theorem states that three coplanar forces maintaining a rigid body in equilibrium must be concurrent or parallel?
  1. A
    Varignon's theorem
  2. B
    Three-force equilibrium theorem
  3. C
    Euler's theorem
  4. D
    Kennedy's theorem
Question 21Single Answer
The moment of a force about a point is equal to?
  1. A
    Force divided by angular velocity
  2. B
    Force divided by perpendicular distance
  3. C
    Force multiplied by body mass
  4. D
    Force multiplied by perpendicular distance from the point
Question 22Single Answer
Varignon's theorem states that the moment of a resultant force equals?
  1. A
    Product of individual force magnitudes
  2. B
    Maximum individual moment
  3. C
    Algebraic sum of moments of component forces
  4. D
    Difference between horizontal and vertical forces
Question 23Single Answer
A couple consists of?
  1. A
    Two unequal concurrent forces
  2. B
    Two equal, opposite and parallel noncollinear forces
  3. C
    Three equal concurrent forces
  4. D
    Two forces acting along the same line
Question 24Single Answer
Which physical quantity represents the turning effect of a couple?
  1. A
    Linear momentum
  2. B
    Couple moment
  3. C
    Impulse
  4. D
    Work
Question 25Single Answer
A force of 200 N acts perpendicular to a 0.4 m lever arm. Its moment is?
  1. A
    80 N m
  2. B
    500 N m
  3. C
    200 N m
  4. D
    50 N m

Strength of Materials

Question 26Single Answer
Which quantity represents the internal resisting force per unit area developed in a loaded member?
  1. A
    Strain
  2. B
    Stress
  3. C
    Modulus of resilience
  4. D
    Strain energy
Question 27Single Answer
A circular bar of diameter 20 mm carries an axial tensile load of 31.416 kN. Its nominal tensile stress is approximately?
  1. A
    150 MPa
  2. B
    50 MPa
  3. C
    200 MPa
  4. D
    100 MPa
Question 28Single Answer
The longitudinal strain in a uniformly stretched prismatic bar is defined as?
  1. A
    Change in length divided by original length
  2. B
    Axial force divided by area
  3. C
    Lateral contraction divided by diameter
  4. D
    Original length divided by elongation
Question 29Single Answer
A bar 2 m long extends by 1 mm. Its longitudinal strain is?
  1. A
    0.005
  2. B
    0.00005
  3. C
    0.0005
  4. D
    0.05
Question 30Single Answer
Hooke's law is applicable to a material when?
  1. A
    Stress is proportional to strain within the linear elastic region
  2. B
    Plastic deformation is dominant
  3. C
    The material has fractured
  4. D
    Its strain is independent of stress
Question 31Single Answer
The elastic limit of a material is the maximum stress up to which?
  1. A
    Plastic strain becomes infinite
  2. B
    It recovers its original dimensions after unloading
  3. C
    Fracture must occur
  4. D
    Strain energy becomes zero
Question 32Single Answer
Which material behaviour is characterized by significant permanent deformation before fracture?
  1. A
    Perfect brittleness
  2. B
    Pure elasticity
  3. C
    Zero ductility
  4. D
    Ductility
Question 33Single Answer
A brittle material typically exhibits?
  1. A
    Extensive necking before failure
  2. B
    Little plastic deformation before fracture
  3. C
    Large plastic elongation
  4. D
    Infinite yield strain
Question 34Single Answer
The slope of the initial straight portion of a uniaxial stress-strain curve represents?
  1. A
    Young's modulus
  2. B
    Bulk modulus
  3. C
    Shear force
  4. D
    Modulus of toughness
Question 35Single Answer
Engineering stress is calculated using?
  1. A
    Original cross-sectional area
  2. B
    Instantaneous cross-sectional area
  3. C
    Fractured cross-sectional area only
  4. D
    Area under the stress-strain curve

Thermodynamics

Question 36Single Answer
A pure substance in thermodynamics is defined as a substance having?
  1. A
    Only one phase at all conditions
  2. B
    Constant temperature during every process
  3. C
    Constant density at all pressures
  4. D
    Uniform and invariant chemical composition
Question 37Single Answer
Which of the following represents a pure substance under thermodynamic equilibrium?
  1. A
    A mixture of nitrogen and oxygen
  2. B
    Air mixed with water vapour
  3. C
    Water mixed with lubricating oil
  4. D
    Liquid water and water vapour in equilibrium
Question 38Single Answer
The critical point of a pure substance is the state at which?
  1. A
    Its specific volume becomes zero
  2. B
    Saturated liquid and saturated vapour states become identical
  3. C
    Its temperature reaches absolute zero
  4. D
    Its pressure becomes atmospheric
Question 39Single Answer
The triple point of a pure substance represents equilibrium among?
  1. A
    Two liquid phases only
  2. B
    Liquid and vapour only
  3. C
    Solid, liquid and vapour phases
  4. D
    Solid and vapour only
Question 40Single Answer
Which thermodynamic property is defined as volume per unit mass?
  1. A
    Specific volume
  2. B
    Density
  3. C
    Enthalpy
  4. D
    Internal energy

Internal Combustion (I.C.) Engine

Question 41Single Answer
The primary purpose of air-standard cycle analysis is to?
  1. A
    Determine exact combustion chemistry
  2. B
    Predict only exhaust emissions
  3. C
    Establish an idealized basis for comparing engine cycles
  4. D
    Calculate lubricant viscosity
Question 42Single Answer
Which working fluid is assumed throughout an air-standard cycle?
  1. A
    Saturated steam
  2. B
    Actual fuel-air products
  3. C
    Air behaving as an ideal gas
  4. D
    Liquid diesel fuel
Question 43Single Answer
In the cold-air-standard approximation, specific heats are assumed?
  1. A
    Dependent on pressure only
  2. B
    Constant at a reference temperature
  3. C
    Equal to each other
  4. D
    Equal to zero
Question 44Single Answer
Which process replaces actual combustion in the air-standard Otto cycle?
  1. A
    Constant-pressure heat rejection
  2. B
    Isothermal compression
  3. C
    Constant-volume heat addition
  4. D
    Polytropic expansion
Question 45Single Answer
The Otto cycle is the ideal air-standard model generally associated with?
  1. A
    Gas turbines
  2. B
    Steam turbines
  3. C
    Hydraulic turbines
  4. D
    Spark-ignition reciprocating engines

Steam Engineering and Power Plant Engineering

Question 46Single Answer
Which thermodynamic cycle forms the basis of conventional steam power plants?
  1. A
    Otto cycle
  2. B
    Diesel cycle
  3. C
    Brayton cycle
  4. D
    Rankine cycle
Question 47Single Answer
The four principal components of a simple Rankine cycle are?
  1. A
    Boiler, injector, carburettor and flywheel
  2. B
    Compressor, combustor, nozzle and turbine
  3. C
    Evaporator, compressor, condenser and expansion valve
  4. D
    Pump, boiler, turbine and condenser
Question 48Single Answer
In an ideal Rankine cycle, compression of feedwater in the pump is assumed?
  1. A
    Isothermal
  2. B
    Isentropic
  3. C
    Isenthalpic
  4. D
    Constant volume
Question 49Single Answer
Heat addition in the boiler of an ideal Rankine cycle occurs at?
  1. A
    Constant volume
  2. B
    Constant entropy
  3. C
    Constant pressure
  4. D
    Constant temperature throughout
Question 50Single Answer
Steam expansion in an ideal Rankine-cycle turbine is?
  1. A
    Isentropic
  2. B
    Constant volume
  3. C
    Constant pressure
  4. D
    Isothermal
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