SSC JE PREVIOUS YEAR QUESTION (2018) SET 1

1 - The number of links (l) which is required to form a kinematic chain can be expressed in term of the number of pairs (p) as ________.

1) l = 2p-4
2) l = 2p-3
3) l = 2p-2
4) l = 2p-5

... Answer is…
l = 2p-4

2- The graph of turning moment diagram is drawn between ________.

1) crank angle and crank radius
2) crank angle and crank effort
3) crank effort and crank angle
4) crank radius and crank angle

... Answer is…
crank effort and crank angle

3- The mass of flywheel of a steam engine is 3250 kg with the radius of gyration of 1 m. The starting torque of the engine is 4500 N-m. What is the angular acceleration (rad/s2) of the flywheel?

1) 3.4
2) 2
3) 2.48
4) 1.38

... Answer is…
1.38

4 - A pulley is driven by a flat belt and the maximum tension produced in the belt is of 1400 N. The belt has the density of 1000 kg/m3, 100 mm wide and 5 mm thick. What is the speed (m/sec) of the belt for the maximum power?

1) 32
2) 31
3) 30.55
4) 3.05

... Answer is…
30.55

5 - The rotary internal combustion engine is the inversion of ________.

1) four bar link chain
2) double slider crank chain
3) single slider crank mechanism
4) Rocker crank mechanism

... Answer is…
single slider crank mechanism

6 - The pressure distribution in the uniform wear theory is ________.

1) directly proportional to radius
2) directly proportional to the square of radius
3) inversely proportional to radius
4) inversely proportional to the square of radius

... Answer is…
inversely proportional to radius

7 - When the friction lining is new, the wear varies ________.

1) directly to radius
2) inversely to radius
3) directly to the square of radius
4) inversely to the square of radius

... Answer is…
directly to radius

8 - What is the radial distance of a tooth from the pitch circle to the top of the tooth known as?

1) Dedendum
2) Addendum
3) Pitch circle diameter
4) Module

... Answer is…
Addendum

9 - Which of the following statement is TRUE about the contact ratio?

1) Varies directly to the length of the arc of contact
2) Inversely proportional to the module
3) Inversely proportional to the circular pitch
4) All options are correct

... Answer is…
All options are correct

10 - Which of the following is the type of pendulum governor?

1) Hartnell governor
2) Proell governor
3) Porter governor
4) Watt governor

... Answer is…
Watt governor

11 - Which of the following governors does not have central load attached to their sleeves?

1) Porter governor
2) Watt governor
3) Proell governor
4) None of these

... Answer is…
Watt governor

12 - What will be the vertical height (m) of a watt governor, if the speed of rotation is 80 rpm?

1) 1.4
2) 1.14
3) 0.14
4) 0.11

... Answer is…
0.14

13 - Which of the following term defines the size of the cam?

1) Base circle
2) Prime circle
3) Pitch circle
4) Pitch curve

... Answer is…
Base circle

14 - What term is used for the combined effect of all the forces on a body?

1) Load
2) Stress
3) Strain
4) None of these

... Answer is…
Load

15 - Which of the flowing load does not act on the considerable length of the beam?

1) Uniformly distributed
2) Triangular
3) Point
4) Uniformly varying

... Answer is…
Point

16 - Which term states the S.I unit of stress?

1) kN/mm
2) N/mm^2
3) N/mm^3
4) m^3/sec

... Answer is…
N/mm^2

17 - Maximum shear stress theory was postulated by ________.

1) ST Venant
2) Mohr
3) Rankine
4) Tresca

... Answer is…
Tresca

18 - The equivalent length of the column when both the ends are fixed is ________.

1) 1
2) 1/2
3) 1/4
4) 2l

... Answer is…
1/2

19 - The slenderness ratio of the columns is ________.

1) directly proportional to the effective length
2) directly proportional to the least radius of gyration
3) directly proportional to the square of effective length
4) directly proportional to the square of least radius of gyration

... Answer is…
directly proportional to the effective length

20 - Rankine theory is applicable to the ________.

1) Short strut/column
2) Long column
3) Both short and long column
4) None of these

... Answer is…
Both short and long column

21 - Which of the following assumptions is INCORRECT about the long column?

1) The column behaves elastically.
2) The load acts perfectly axial and passes through the centroid of the column section.
3) The weight of the column is neglected.
4) The material is non-homogeneous and anisotropic.

... Answer is… 4)
The material is non-homogeneous and anisotropic.

22 - What is the maximum shear stress on the wall of a thin cylinder, if it has a diameter of d, thickness of t and the gauge pressure in the cylinder is p?

1) pd/t
2) pd/4t
3) pd/2t
4) pd/8t

... Answer is… 4)
pd/8t

23 - What is the volumetric strain in the thin cylinder subjected to internal pressure having hoop stress of 200 MPa, modulus of elasticity, E=200 GPa and poissons ratio=0.25?

1) 20/1000
2) 2/1000
3) 0.2/1000
4) 0.02/1000

... Answer is… 2)
2/1000

24 - The property of the material to regain its original shape after deformation when the external forces are removed is ________.

1) plasticity
2) elasticity
3) durability
4) None of these

... Answer is…
elasticity

25 - A rod of dimension 20 mm x 20 mm is carrying an axial tensile load of 10 kN. The tensile stress developed is ________.

1) 0.025 MPa
2) 0.25 MPa
3) 25 MPa
4) 250 MPa

... Answer is…
25 MPa

26 - Which is the CORRECT option for the polar moment of inertia of the solid shaft?

1) J = π/64 d4
2) J = π/32 d4
3) J = π/16 d2
4) J = π/16 d4

... Answer is…
J = π/32 d4

27 - The triple point on a P-V diagram is ________.

1) a line
2) a point
3) a triangle
4) not present

... Answer is…
a line

28 - Which of the following statement related to entropy is TRUE?

1) Minimum entropy is observed when the system is in equilibrium with the surrounding.
1) Minimum entropy is observed when the system is in equilibrium with the surrounding.
3) Substance in solid phase has the least entropy.
4) Entropy conservation takes place in all irreversible processes.

... Answer is…
4) Entropy conservation takes place in all irreversible processes.

29 - If the COP of Carnot refrigerator is 4, then the thermal efficiency of the Carnot engine would be ________.

1) 0.33
2) 0.25
3) 0.2
4) 0.18

... Answer is…
0.2

30 - While working between temperatures 150 K and 300 K, the entropy change experienced by the Carnot engine during heat addition is 1 kJ/K, the work produced (kJ) by the engine is ________.

1) 100
2) 150
3) 300
4) 600

... Answer is…
2) 150

31 - A heat engine working between the source at 200oC and rejects heat at 25oC receives 5 kW of heat. Work done for this engine is equal to 0 kW. Does this satisfy the inequality of Clausius?

1) Yes
2) No
3) Cannot be determined
4) None of these

... Answer is…
1) Yes

32 - An ideal gas with heat capacity ratio of 2 is used in an ideal Otto-cycle which operates between minimum and maximum temperatures of 200 K and 1800 K. What is the compression ratio of the cycle for maximum work output?

1) 1.5
2) 2
3) 3
4) 4

... Answer is…
2) 2

33 - In an Otto cycle, air is compressed from 3 litres to 2.4 litres from a starting pressure of 1.5 kg/cm2. The net output per cycle is 400 kJ. What is the mean effective pressure (kPa) of the cycle?

1) 500
2) 567
3) 667
4) 700

... Answer is…
3) 667

34 - The combustion in a compression ignition engine is ________.

1) heterogeneous
2) homogeneous
3) laminar
4) turbulent

... Answer is…
1) heterogeneous