ssc je mechanical question paper

#sscjemechanical #sscje2018

**SSC Junior Engineer Exam Paper – 2018 “held on 23 January 2018” Evening Shift (Mechanical Engineering) **

**Q 1:** The number of joints (j) which constitutes a kinematic chain can be expressed in terms of number of links (l) as_________.

**Options:**

**1)** j = (3/4)l – 2

**2)** j = (3/2)l + 2

**3)** j = (3/2)l – 2

**4)** j = l – (2/3)

**Answer:** j = (3/2)l – 2

**Q 2:** Which of the following will lead to the formation of higher pair ?

**Options:**

**1)** Sliding pair

**2)** Turning pair

**3)** Rolling pair

**4)** None of these

**Answer:** Rolling pair

**Q 3:** What is the degree of freedom of the mechanism shown below ?

**Options:**

**1)** 1

**2)** 2

**3)** 3

**4)** 4

**Answer:** 1

**Q 4:** Which of the following statement is **TRUE** regarding work done per cycle ?

**Options:**

**1)** Work done per cycle is directly proportional to the mean torque

**2)** Work done per cycle is directly proportional to the angle turned in one revolution

**3)** Work done per cycle is inversely proportional to the angle turned in one revolution

**4)** Both Work done per cycle is directly proportional to the mean torque and Work done per cycle is directly proportional to the angle turned in one revolution

**Answer:** Both Work done per cycle is directly proportional to the mean torque and Work done per cycle is directly proportional to the angle turned in one revolution

**Q 5:** The angular acceleration and the moment of inertia of the flywheel is 0.6 rad/s^{2} and 2500 kg.m^{2} respectively. What is the kinetic energy (in kN-m) of the flywheel after 10 seconds from the start ?

**Options:**

**1)** 45

**2)** 450

**3)** 4.5

**4)** 4500

**Answer:** 45

**Q 6:** The power transmission takes place from a pulley of diameter 1 m running at the speed of 250 rpm to a pulley of 2.50 m diameter by means of a belt.

**Options:**

**1)** 110

**2)** 150

**3)** 100

**4)** 625

**Answer:** 100

**Q 7:** The scotch yoke mechanism is the inversion of _______.

**Options:**

**1)** Four bar link chain

**2)** Double slider crank chain

**3)** Single slider crank chain

**4)** None of these

**Answer:** Double slider crank chain

**Q 8:** Which of the following is **NOT** the inversion of single slider crank chain ?

**Options:**

**1)** Pendulum pump

**2)** Whitworth quick return motion mechanism

**3)** Oscillating cylinder engine

**4)** Eliptical trammel

**Answer:** Eliptical trammel

**Q 9:** Which of the following is **NOT** the inversion of single slider crank chain ?

**Options:**

**1)** Uniform pressure theory

**2)** Uniform wear theory

**3)** Uniform friction theory

**4)** None of these

**Answer:** Uniform wear theory

**Q 10:** The equation for the calculation of torque transmitting capacity in the conical clutch as per uniform wear theory is _______.

**Options:**

**1)** M_{t} = (μP / 4sin α) (D + d)

**2)** M_{t} = (μP / 4sin α) (D – d)

**3)** M_{t} = (μP / sin α) (D – d)

**4)** M_{t} = (2μP / sin α) (D – d)

**Answer:** M_{t} = (μP / 4sin α) (D + d)

**Q 11:** Which of the following statement is TRUE about the length of arc of contact ?

**Options:**

**1)** Inversely proportional to the module

**2)** Varies directly to the length of the path of contact

**3)** Inversely proportional to the circular pitch

**4)** All option are correct

**Answer:** Varies directly to the length of the path of contact

**Q 12:** The profile of gears having module of 12 mm and length of arc of contact is 60 mm. What is the contact ratio of the gear profile ?

**Options:**

**1)** 2

**2)** 1.2

**3)** 1.6

**4)** 5

**Answer:** 1.6

**Q 13:** Which of the following is NOT the type of loaded type governor ?

**Options:**

**1)** Dead weight governor

**2)** Spring controlled governor

**3)** Watt governor

**4)** Porter governor

**Answer:** Watt governor

**Q 14:** The types of failure involved in the analysis of the riveted joints are ?

**1)** Shear failure of rivet

**2)** Tensile failure of the plate

**3)** Crushing failure of the plate

**Options:**

**1)** (1) and (2) only

**2)** (2) and (3) only

**3)** (1) (2) and (3)

**4)** (1) and (3) only

**Answer:** (1) (2) and (3)

**Q 15:** Which of the following options is correct about the motion of the follower ?

**Options:**

**1)** Uniform velocity

**2)** Simple harmonic motion

**3)** Uniform acceleration

**4)** All option are correct

**Answer:** All option are correct

**Q 16:** When a body is said to be in dynamic equilibrium ?

**Options:**

**1)** When the body is moving with non uniform accelerations.

**2)** When the body is in uniform motion along a circular path.

**3) **When the body is in uniform motion along a straight line.

**4)** When the body is moving with instantaneous velocity.

**Answer:** When the body is in uniform motion along a straight line.

**Q 17:** Which of the following term can also be used to state the dynamic equilibrium ?

**Options:**

**1)** Translatory equilibrium

**2)** Static equilibrium

**3)** Kinetic equilibrium

**4)** Rotational equilibrium

**Answer:** Kinetic equilibrium

**Q 18:** What is the direction of application of friction force with respect to the direction of motion of an object ?

**Options:**

**1)** Same

**2)** Perpendicular

**3)** Opposite

**4)** Downward

**Answer:** Opposite

**Q 19:** What is the S.I unit of Poisson’s ratio ?

**Options:**

**1)** kN/mm^{2}

**2)** N/mm^{2}

**3)** mm

**4)** Unitless

**Answer:** Unitless

**Q 20:** Maximum principal stress theory was postulated by _______.

**Options:**

**1)** ST Venant

**2)** Mohr

**3)** Rankine

**4)** Tresca

**Answer:** Rankine

**Q 21:** The equivalent length of the column, when both the ends are hinged is ______.

**Options:**

**1)** l

**2)** l / 2

**3)** l / 4

**4)** 2l

**Answer:** l

**Q 22:** The expression for the slenderness Ratio of the columns is given as ______.

**Options:**

**1)** (l_{e} / k_{min})^{2}

**2) **(2l_{e} / k_{min})^{2}

**3)** (l_{e} / k_{min})

**4)** (2l_{e} / k_{min})

**Answer:** (l_{e} / k_{min})

**Q 23:** The expression for the Rankine’s crippling load is given as _______.

**Options:**

**1)**

**2) **

**3) **

**4) **

**Answer: **

** **

**Q 24:** What is the ratio of the Euler’s buckling loads of column having (i) both ends fixed and (ii) one end fixed and other end free is ?

**Options:**

**1)** 4:1

**2)** 16:1

**3)** 1:4

**4)** 2:1

**Answer:** 16:1

**Q 25:** The thin walled cylindrical vessel has the wall thickness t and diameter d is subjected to the gauge pressure of p. If the diameter of the vessel is doubled, then what is the ratio of hoop stress as compared to initial value ?

**Options:**

**1)** 1:1

**2)** 2:1

**3)** 1:2

**4)** 1:4

**Answer:** 1:2

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**Q 26:** A metal pipe is subjected to internal pressure of 10 kgf /cm^{2}. If the permissible tensile stress in the metal is 200 kgf/cm^{2} and the thickness of the pipe is 2.5 cm. What is the diameter of the metal pipe ?

**Options:**

**1)** 10

**2)** 100

**3)** 200

**4)** 20

**Answer:** 100

**Q 27:** A power transmission shaft of diameter d rotating at the speed of N rpm. The power P is related to diameter d and N as_______.

**Options:**

**1)**

**2)**

**3)**

**4)**

**Answer:**

** **

**Q 28:** Which is the correct option for the stress experienced by the shaft when the power transmission in shaft takes place through the gears ?

**Options:**

**1)** Varying bending and constant torsional stresses

**2)** Constant bending and varying torsional stresses

**3)** Torsional stress.

**4)** Bending stress only

**Answer:** Varying bending and constant torsional stresses

**Q 29:** A beam of diameter 75 mm has a span length of 10 m is subjected to uniform distributed load of w kN/m. The maximum value of bending stress produced is 6.75 kN-m. What is the value of distributed load, if the beam is simply supported ?

**Options:**

**1)** 1.5

**2)** 0.54

**3)** 2

**4)** 5.4

**Answer:** 0.54

**Q 30:** A steel bar of dimension 10 mm **x** 1 mm **x** 1 mm is free to expand is heated from 15 ^{o}C to 25 ^{o}C. What stress shall be developed ?

**Options:**

**1)** Tensile stress

**2)** No stress

**3)** Shear stress

**4)** Compressive stress

**Answer:** No stress

**Q 31:** For a pure substance in gaseous phase to be liquefied, the gas has to undergo initial cooling below the_____.

**Options:**

**1)** Critical state

**2)** Saturated liquid line

**3)** Saturated vapor line

**4)** Triple point line

**Answer:** Critical state

**Q 32:** What is the CORREET order of decrease in entropy ?

**a)**Solid phase**b)**Liquid phase**c)**Gaseous phase

**Options:**

**1)** (a) > (b) > (c)

**2)** (c) > (b) > (a)

**3)** (c) > (a) > (b)

**4)** (a) > (c) > (b)

**Answer:** (c) > (b) > (a)

**Q 33:** The entropy always increases for an isolated system and when the equilibrium is reached, it is_______.

**Options:**

**1)** Maximum

**2)** Same as the Initial starting state

**3)** More than initial starting state

**4)** Zero

**Answer:** Maximum

**Q 34:** A Carnot engine operates between T_{1} and T_{2}. If there is an increase in source temperature by t and a decrease in sink temperature b t. How is the efficiency in both cases is related ?

**Options:**

**1)** η_{1} > η_{2}

**2)** η_{1} < η_{2}

**3)** η_{1} = η_{2}

**4)** None of these

**Answer:** η_{1} < η_{2 }

**Q 35:** In a surrounding, the amount of irreversibility of a process undergone by a system is determined by_____.

**Options:**

**1)** Entropy change of the system

**2)** Entropy change of the surrounding

**3)** Entropy increase of the universe

**4)** Entropy decrease of the universe.

**Q 36:** In Otto cycle, r is the compression ratio and γ is the adiabatic index. Which relation defines the air standard efficiency ?

**Options:**

**1)** η = 1 – (1 / r^{γ-1})

**2)** η = 1 – (1 / r^{γ})

**3)** η = 1 – (1 / r^{γ}+1)

**4)** η = 1 – (1 / r^{γ / γ-1})

**Answer:** η = 1 – (1 / r^{γ-1})

**Q 37:** For the same operating maximum pressure and temperature, which cycle will have the highest efficiency ?

**Options:**

**1)** Diesel cycle

**2)** Dual cycle

**3)** Otto cycle

**4)** None of these

**Answer:** Diesel cycle

**Q 38:** The mean effective pressure of Otto cycle is given by______.

**Options:**

**1)** P_{m} = {p_{1}r_{k}(r_{p} – 1)(r_{k}^{γ-1} – 1) / (γ – 1) (r_{k} – 1)}

**2)** P_{m} = {p_{1}r_{k}(r_{p} – 1)(r_{k}^{γ+1} – 1) / (γ + 1) (r_{k} – 1)}

**3)** P_{m} = {p_{1}r_{k}(r_{p} + 1)(r_{k}^{γ-1} – 1) / (γ – 1) (r_{k} + 1)}

**4)** P_{m} = {p_{1}r_{k}(r_{p} – 1)(r_{k}^{γ-1} + 1) / (γ – 1) (r_{k} – 1)}

**Answer:** P_{m} = {p_{1}r_{k}(r_{p} – 1)(r_{k}^{γ-1} – 1) / (γ – 1) (r_{k} – 1)}

**Q 39:** What is the state at which phase change occurs without a change in pressure and temperature is known as ?

**Options:**

**1)** Critical state

**2)** Saturation state

**3)** Equilibrium state

**4)** None of these

**Answer:** Critical state

**Q 40:** What value of the dryness fraction (in %) represents the dry saturated state of vapour ?

**Options:**

**1)** 0

**2)** 25

**3)** 50

**4)** 100

**Answer:** 100

** **

**Q 41:** Which factor contributes to the efficiency of the Otto cycle ?

**Options:**

**1)** Compression ratio

**2)** Operating pressure

**3)** Operating temperature

**4)** None of these

**Answer:** Compression ratio

**Q 42:** If a Carnot refrigerator has a COP of 6. What is the ratio of the lower to the higher absolute temperature ?

**Options:**

**1)** 1-6

**2)** 7-8

**3)** 6-7

**4)** 1-7

**Answer:** 6-7

**Q 43:** Which of the below stated are properties of a PMM-2 ?

**1)** When net work is equal to the heat absorbed and work efficiency is 100%.

**2)** Heat is exchanged from one heat reservoir only

**3)** It violates Kelvin-Planck statement.

**4)** It is hypothetical machine.

**Options:**

**1)** (1), (2) and (4)

**2)** (1), (3) and (4)

**3)** (2), (3) and (4)

**4)** (1), (2), (3) and (4)

**Answer:** (1), (2), (3) and (4)

**Q 44:** Tonnes of refrigeration mean_______.

**Options:**

**1)** The weight of the machine is one tonne.

**2)** The weight of the refrigerant is one tonne.

**3)** The rate of the heat extraction is one tone.

**4)** None of these

**Answer:** The rate of the heat extraction is one tone.

**Q 45:** What is the ratio W/Q (W=work transfer from cycle, Q = heat transfer to the cycle) known as ?

**Options:**

**1)** Air standard efficiency

**2)** Specific consumption

**3)** Specific work transfer

**4)** Work ratio

**Answer:** Air standard efficiency

**Q 46:** What processes does Carnot cycle consist of ?

**Options:**

**1)** Two isothermal and two adiabatic processes

**2)** Two isothermal and two constant volume processes

**3)** Two isothermal and two constant pressure processes

**4)** Two constant pressure and two constant volume processes.

**Answer:** Two isothermal and two adiabatic processes

**Q 47:** What is the temperature at which a system goes under a reversible isothermal process without heat transfer ?

**Options:**

**1)** Absolute zero temperature

**2)** Critical temperature

**3)** Reversible temperature

**4)** Boiling temperature

**Answer:** Absolute zero temperature

**Q 48:** How is the thermal efficiency of an I.C engine related to compression ratio ?

**Options:**

**1)** Increase

**2)** Decrease

**3)** May increase or decrease

**4)** Remains same

**Answer:** Increase

**Q 49:** All the processes in an air standard cycle are assumed to be______.

**Options:**

**1)** Adiabatic

**2)** Irreversible

**3)** Isothermal

**4)** Reversible

**Answer:** Reversible

**Q 50:** Water flows through a turbine in which due to friction there is a temperature rise from 30^{o}C to 35^{o}C. If there is no heat transfer taking place during the process. What is the change in the entropy of water ?

**Options:**

**1)** 0.077

**2)** 0.079

**3)** 0.406

**4)** 0.496

**Answer:** 0.079

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**Q 51:** 1151 – In 18-4-11 HSS (High speed steel) the percentage of chromium is

**Options:**

**1)** 1%

**2)** 4%

**3)** 18%

**4)** 20%

**Answer:** 4%

**Q 52:** The pH value of neutral solution is

**Options:**

**1)** Equal to 7

**2)** Less than 7

**3)** Greater than 7

**4)** None of these

**Answer:** Equal to 7

**Q 53:** _______is better suited for lighter duty bearings.

**Options:**

**1)** Phosphor Bronze

**2)** Plastics

**3)** White metal

**4)** Monel metal

**Answer:** Phosphor Bronze

**Q 54:** ______is not the neutral refractory material.

**Options:**

**1)** Graphite

**2)** Karnelite

**3)** Chromite

**4)** Dolomite

**Answer:** Karnelite

**Q 55:** ________structure has maximum hardness.

**Options:**

**1)** Troostile

**2)** Pearlite

**3)** Martensite

**4)** Sorbite

**Answer: **Troostile

**Q 56:** ______has least coefficient of expension

**Options:**

**1)** Manganin

**2)** Invar

**3)** Constantan

**4)** Duralumin

**Answer:** Invar

**Q 57:** ________is the essential gradient of any hardened steel.

**Options:**

**1)** Carbon

**2)** Pearlite

**3)** Austenite

**4)** Martensite

**Answer:** Carbon

**Q 58:** ______structure can be studied by naked eye.

**Options:**

**1)** Atomic

**2)** Grain

**3)** Micro

**4)** Macro

**Answer:** Grain

**Q 59:** _______is used for bearing liner.

**Options:**

**1)** Brass

**2)** Bronze

**3)** Gun metal

**4)** Babbitt metal

**Answer:** Babbitt metal

**Q 60:** _______is the most Important element which controls the physical properties of steel.

**Options:**

**1)** Carbon

**2)** Chromium

**3)** Vanadium

**4)** Tungsten

span style=”color: #000000; font-size: 10pt;”>**Answer:** Carbon

**Q 61:** Practical fluids

**Options:**

**1)** Are viscous

**2)** Possess surface tension

**3)** Are compressible

**4)** Possess all the above properties

**Answer:** Possess all the above properties

**Q 62:** Property of a fluid by which its own molecules are attracted is called

**Options:**

**1)** Adhesion

**2)** Cohesion

**3)** Viscosity

**4)** Compressibility

**Answer:** Cohesion

**Q 63:** For very great pressures, viscosity of most gases and liquids

**Options:**

**1)** Remains same

**2)** Increases

**3)** Decreases

**4)** Shows erratic behavior

**Answer:** Increases

**Q 64:** The bulk modulus of elasticity

**Options:**

**1)** Has the dimensions of 1/pressure

**2)** Increases with pressure

**3)** Is large when fluid is more compressible

**4)** Is independent of pressure and viscosity

**Answer:** Increases with pressure

**Q 65:** Which of the following statements is not true ?

**Options:**

**1)** Fluids are capable of flowing

**2)** Fluids conform to the shape of the containing vessels

**3)** When in equilibrium, fluids cannot sustain tangential forces

**4)** When in equilibrium, fluids can sustain shear forces

**Answer:** When in equilibrium, fluids can sustain shear forces

**Q 66:** The conditions of the stable equilibrium of a floating body are

**Options:**

**1)** The meta-centre should lie above the centre of gravity

**2)** The centre of buoyancy and the centre of gravity must lie on the same vertical line

**3)** A righting couple should be formed

**4)** All options are correct

**Answer:** All options are correct

**Q 67:** A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury ?

**Options:**

**1)** The metal piece will simply float over the mercury

**2)** The metal piece will be immersed in mercury by half

**3)** Whole of the metal piece will be immersed with its top surface just at mercury level

**4)** Metal piece will sink to the bottom

**Answer:** Whole of the metal piece will be immersed with its top surface just at mercury level

**Q 68:** If the surface of the liquid is convex, then

**Options:**

**1)** Cohesion pressure is negligible

**2)** Cohesion pressure is decreased

**3)** Cohesion pressure is increased

**4)** None of these

**Answer: **Cohesion pressure is increased

**Q 69:** Liquids transmit pressure equally in all the directions. This is according to

**Options:**

**1)** Boyle’s law

**2)** Archimedes law

**3)** Pascal’s law

**4)** Newton’s formula

**Answer:** Pascal’s law

**Q 70:** Mercury is often used in barometer because:

- It is the best liquid
- The height of barometer will be less
- Its vapor pressure is so low that it may be neglected

**Options:**

**1)** Only A

**2)** Only B

**3)** Both A and B

**4)** Neither A nor B

**Answer:** Both A and B

**Q 71:** The losses due to sudden contraction are expressed by

**A)**(v_{1}^{2}– v_{2}^{2}) / 2g**B)**(v_{2}^{2}– v_{1}^{2}) / 2g**C)**(v_{1}– v_{2})^{2}/ g**D)**(v_{1}– v_{2})^{2}/ 2g

**Options:**

**1)** Only A

**2)** Only B

**3)** Only C

**4)** None of these

**Answer:** None of these

**Q 72:** Cipolletti notch is designed as trapezoid with Its sides sloping at 1 horizontal and

**Options:**

**1)** 1 vertical

**2)** 2 vertical

**3)** 3 vertical

**4)** 4 vertical

**Answer:** 4 vertical

**Q 73: **The flow in venture flame takes place at

**Options:**

**1)** Atmospheric pressure

**2)** At pressure greater than atmospheric pressure

**3)** Vacuum

**4)** High pressure

**Answer:** Atmospheric pressure

**Q 74:** A hydraulic ram acts like

**Options:**

**1)** A centrifugal pump

**2)** A rotary pump

**3)** A reciprocating pump

**4)** An impulse pump

**Answer:** An impulse pump

**Q 75:** The rise of liquid along the walls of a revolving cylinder as compared to depression at the centre with respect to initial level s

**Options:**

**1)** Same

**2)** More

**3)** Less

**4)** More or less depending on speed

**Answer:** Same

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**Q 76:** The most economical section of a rectangular channel for maximum discharge is obtained when its depth is equal to

**Options:**

**1)** Half the breadth

**2)** Twice the breadth

**3)** Same as the breadth

**4)** Three-fourth of the breadth

**Answer: **Half the breadth

**Q 77:** In case of a two dimensional flow the components of velocity are given by u=ax; v= by, the point where no motion occurs, is known as

**Options:**

**1)** Critical point

**2)** Neutral point

**3)** Stagnation point

**4)** None of these

**Answer:** None of these

**Q 78:** The head loss in case of hot water flow through a pipe compared to cold water flow will be

**Options:**

**1)** Same

**2)** More

**3)** Less

**4)** More or less depending on range of temperatures

**Answer:** Less

**Q 79:** Maximum efficiency of transmission of power through a pipe is

**Options:**

**1)** 0.25

**2)** 0.3333

**3)** 0.5

**4)** 0.6667

**Answer:** 0.6667

**Q 80:** In the case of turbulent flow

**Options:**

**1)** It occurs in open channel

**2)** Losses are proportional to square of velocity

**3)** Velocity at boundary is zero

**4)** Shear stresses are more compared to laminar flow

**Answer:** Shear stresses are more compared to laminar flow

**Q 81:** Hydraulic grade line for any flow system as compared to energy line is

**Options:**

**1)** Above

**2)** Below

**3)** At same level

**4)** May be below or above depending upon velocity of flow

**Answer:** Below

**Q 82:** For maximum discharge through a circular open channel, the ratio of depth of flow to diameter of channel should be

**Options:**

**1)** 0.7

**2)** 0.5

**3)** 0.65

**4)** None of these

**Answer:** None of these

**Q 83: **A triangular section in open channel flow will be most economical when the vertex angle at the triangle base point is

**Options:**

**1)** 30 degree

**2)** 50 degree

**3)** 20 degree

**4)** None of these

**Answer:** None of these

**Q 84:** The value of coefficient of velocity depends upon

**Options:**

**1)** Slope of orifice

**2)** Size of orifice

**3)** Head of liquid above orifice

**4)** Friction at the orifice surface

**Answer:** Friction at the orifice surface

**Q 85:** The discharge through an orifice fitted in a tank can be increased by

**Options:**

**1)** Fitting a short length of pipe to the outside

**2)** Sharpening the edges of orifice

**3)** Fitting a long length of pipe to the outside

**4)** Fitting a long length of pipe to the inside

**Answer:** Fitting a short length of pipe to the outside

**Q 86:** Total pressure on the top of a closed cylindrical vessel completely filled with liquid is directly proportional to

**Options:**

**1)** Radius

**2)** Square of radius

**3)** cube of radius

**4)** None of these

**Answer:** None of these

**Q 87:** If flow in an open channel is gradually varied, then the flow will be

**Options:**

**1)** Steady uniform flow

**2)** Unsteady uniform flow

**3)** Steady non-uniform flow

**4)** Unsteady non-uniform flow

**Answer:** Steady non-uniform flow

**Q 88:** The energy loss in flow through nozzle as compared to venturimeter is

**Options:**

**1)** Same

**2)** More

**3)** Less

**4)** Unpredictable

**Answer:** More

**Q 89:** Orifice is an opening

**Options:**

**1)** With closed perimeter and of regular form through which water flows

**2)** With prolonged sides having length of 2 to 3 diameters of opening in thick wall

**3)** With partially full flow

**4)** In hydraulic structure with regulation provision

**Answer:** With closed perimeter and of regular form through which water flows

**Q 90:** The value of coefficient of discharge in comparison to coefficient of velocity is

**Options:**

**1)** More

**2)** Less

**3)** Same

**4)** Unpredictable

**Answer:** Less

**Q 91:** Heating of dry steam above saturation temperature is known as

**Options:**

**1)** Enthalpy

**2)** Superheating

**3)** Super saturation

**4)** Latent heat

**Answer:** Superheating

**Q 92:** The specific heat of superheated steam in kcal/kg is generally of the order of

**Options:**

**1)** 0.1

**2)** 0.3

**3)** 0.5

**4)** 0.8

**Answer:** 0.5

**Q 93:** Adiabatic process is

**Options:**

**1)** Essentially as isentropic process

**2)** Non-heat transfer process

**3)** Reversible process

**4)** Constant temperature process

**Answer:** Non-heat transfer process

**Q 94:** The diameter (in cm) of Cornish boiler is of the order of

**Options:**

**1)** 1 to 2

**2)** 1.5 to 2.5

**3)** 2 to 3

**4)** 2.5 to 3.5

**Answer:** 1 to 2

**Q 95:** Which of the following boilers is best suited to meet fluctuating demands ?

**Options:**

**1)** Babcock an and Wilcox

**2)** Locomotive

**3)** Lancashire

**4)** Cochran

**Answer:** Locomotive

**Q 96:** An engine indicator is used to determine the following

**Options:**

**1)** Speed

**2)** Temperature

**3)** Volume of cylinder

**4)** None of these

**Answer:** None of these

**Q 97:** Diesel fuel, compared to petrol is

**Options:**

**1)** Less difficult to ignite

**2)** Just about the same difficult to ignite

**3)** More difficult to ignite

**4)** Highly ignitable

**Answer:** More difficult to ignite

**Q 98:** The fuel air ratio in a petrol engine fitted with suction carburetor, operating with dirty air filter as compared to clean filter will be

**Options:**

**1)** Higher

**2)** Lower

**3)** Remain unaffected

**4)** Unpredictable

**Answer:** Unpredictable

**Q 99:** Which of the following is the lightest and most volatile liquid fuel ?

**Options:**

**1)** 6:1

**2)** 9:1

**3)** 12:1

**4)** 15:1

**Answer:** 15:1

**Q 100:** Ignition quality of petrol is expressed by

**Options:**

**1)** Octane number

**2)** Cetane number

**3)** Calorific value

**4)** Self-ignition temperature

**Answer:** Octane number

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