Practice Test: Mechanical Engineering (ME)- 6 - Mechanical Engineering

In the following questions, a sent ence has been given in direct/indirect speech.
Nitin said to me, “why don’t you come with us? why do you want to be so unsocial.

Direction (5) Spotting the error

/In order to transfer (A)

/ branch licenses for one (B)

/ bank to anot her you require special approval from RBI (C)

/ No error (D).

Question 6 to 10 carry Two Marks each

Q.

In an NGO, the daily average ages of 20 illiterate employee is decreased from Rs. 25 to Rs. 10. Thus the
average salary of all the literate (educated) and illiterate employees is decreased by Rs. 10 perday. T he
number of educated employees working in the NGO is :

Common Data Question (7-8)

The ratio of the percentage share of Dairy Milk to that of ot her is?

If in the next year, Crackle and Dairy Milk decided to join hands and increase their market share from their
combined existing share by 20%. What will be their combined sales if the mark size remains the same?

Simple interest on a certain amount is 9/16 of the principle. If the number represent ing the rate of intersest in percent and time in years be equal. T hen time, for when the principal is lent out is,

A boat sails across a river with a velocity of 10 km/hr. If resultant boat velocity is 14 km/hr, then what is the velocity of river water? 

Question 11 to 35 carry One Mark each

Q.

If the probability for A to fail in an examination is .2 and that for B is .3 then the probability that either
A or B fails is

Eigen value of unit ary matrix are always

If    t hen the value of  

______________

A rigid wheel 1.25 diameter is to be provide with a t hin steel t yre. If the stress in the steel t yre is not
to exceed 140 N/mm², what is the int ernal diameter of the tyre? Take E = 2 × 10⁵ N/mm² and
α = 1.2 × 10^-5 per ^oC ________________

In case of solution of a two variable linear programming problem by graphical method one constraints line
comes parallel t o the objective function line which one of the following is correct?

If 'u' and 'v' the component of velocity in x-direction and y-direction respectively are given u = ax+by and
v = cx + dy then the condition to be satisfy is

T he two links OA and OB are connected by a pin joint at 'O'. If the link OA t urns with angular velocity
'ω₁' rad/s in the clockwise direction and th e link OB turns with angular velocity 'ω₂' rad/s is the
anticlockwise direction, then the rubbing velocity at the pin joint 'O' is

Where r = Radius of the pin at 'O'

According to Indian standard specifications, a grey cost iron designated by 'FG200' means that the

T here is a slab having temperat ure at left and right faces 800 K and 600 K respectively and slab material
having conductivit y k = 20 W/mK at 0°C. Find the mean thermal conductivity for the slab given β = 0.01 per
unit kelvin _________________W/mK

The following sheet metal operat ion induces shear stresses in the part

Reduced pressure is

Steam coming out of the whistle of a pressure cooker is

What should be the minimum length two a high strength steel rod of 12.5 mm diamet er so t hat one end
can be t wisted by 30^o with respect of the other end, without exceeding a shear stress of 270 N/mm² given
modulus of rigidity G = 8 × 10⁴ N/mm²

_________________ m

The linear programming is used for opt imization problems which satisfy the following conditions.
(1) Objective function expressed as a linear function of variable
(2) Resources are unlimited
(3) T he decision variable are interrelated and non-negative
Which of the statements is/are correct?

The dynamic viscosity of a fluid is 1 Poise. What should one multiply to it to get the answer in N-s/m²?

T he four bar mechanism shown in the given figure
Given OA = 3cm , AB = 5cm, BC = 6 cm and OC = 7cm is a

Ball bearing are usually made from

For a metallic wall at 200°C a metallic rod prot rudes to the ambient air. The temperat ure at the tip will be
minimum when the rod is made of

Blank holding is normally required in

When 'd' is the diameter of the molecules of a gas in a confined space, the collision frequency will be
proportional to

A cant ilever beam of span 6m carries a point load of 100 kN at its free end and anot her point load 'W'
at the mid of its length. If the maximum bending moment is stated to be 900 kNm, the load 'W' will have
the value _______________________

Free convection flow depends on

Straight turning operation was carried out at the same feed using tools

(1) 8 – 8 – 5 – 5 – 25 – 0 (ASA) and
(2) 8 – 8 – 5.5 – 7 – 30 – 0 (ASA).
Which tool will gives a better surface finish ?

A 150 mm long, 12 mm diameter rod is reduced to 11 mm diameter in a single pass straight turning. If the
spindle speed is 400 rpm and feed rat e is 200 mm/min, determine the material removal rate

____________________ mm³/ min

In the vander wall's equation

T he greater the value of constant equation

Question 36 to 65 carry Two Marks each

Q.

A 60 mm diameter shaft transmitting a torque of 4 kNm is also subjected to an axial tension of 180 kN.
T he maximum tensile stress is

___________________

The momentum correction factor is given by

Consider the following statements
1. In a kinematic inversion, the relative motions between links of the mechanism changes as different
links are made t h e frame by turns.
2. An ellipt ical trammel is a mechanism with three prismatic pairs and one revolute pair. Which of the
statements given above is/are correct?

A shaft rotat ing at constant speed is subjected to variable load. The bearings support ing the shaft are subjected to stationary equivalent radial load of 3kN for 10 percent of time, 2 kN for 20 per cent of time, 1 kN for 30 per cent of time and no load for remaining time of cycle. If the tot al life expected for the bearing is 20 × 10⁶ revolution at 95 per cent reliability, dynamic load rat ing of the ball bearing is

__________________ kN

A plastic pipe (K = 0.5 W/mK) carries a fluid such that the convective heat transfer coefficient is 200 W/
m²K. The average fluid temperat ure is 100°C. T he pipe has an inner diameter of 3 cm and outer diameter
4 cm. If the heat transfer rat e t hrough the pipe per unit length is 450 W/m, calculate the external pipe
temperat ure

A mild steel workpiece is being machined by two different tools 'A' and 'B' under identical machining conditions. The tool life equation for these tools are
Tool A VT^0.31 = 43.3
Tool B VT^0.43 = 89.5
Where V and T are in m/s, respectively. Determine the cutting speed above which tool B will give better tool
life

__________________ m/s

The net work input required for compressor with increase in clearance volume

If hot water and cold water are mixed, then the entropy of the system will be

A solid shaft is subjected to a bending moment of 300 Nm and a twisting moment of 225 Nm. What should
be the diameter of the shaft with a factor of safety of 2 according to the maximum principal strain theory?
Take σ_y = 210 N/mm² and μ = 0.25

______________

Laminar flow takes place in the circular tube. At what distance form the boundary does the local velocity
equal to the average velocity ?

Consider the following statements
1. Corioli’s component of acceleration is a component of translatory acceleration.
2. If the relative motion between two links of a mechanism is pure sliding, then the relative instantaneous
centre for these two links does not exist.
Which of the statements given above is/are correct?

According to Von–Mises criterion, the shear yield stress of the material is 346.56 MPa t hen what will
be t he yield strength of this material in tension assume unidirectional loading _____________MPa

Water flows a 20 mm I.D. at a rat e of 0.02 kg/s entering at 20°C. T he tube is wrapped from outside by an
elect ric heat ing element that produces a uniform flux of 18 K W/m2. If the exit tempe rat ure of water is
50°C, find the length of the pipe needed for this process. Given water propert ies at 35°C, ρ = 997 kg/m³, C_p= 4180 J/kg-K, μ = 820 × 10^–6 Ns/m² and k = 0 .808 W/mK ___________________

A tube is orthogonally machined in a lathe to reduce its length under the following conditions. Outside diameter of the tube 100 mm, inside diameter of the tube 96 mm, RPM of the workpiece 120, longitudinal feed 0.5 mm/ rev, cutting ratio 0.3, tangential force 800 N, axial force 600 N. The total power consumption

_______________W.

100 cubic-meter o f air at 20°C and 60% RH (saturat ion pressure = 0.02384 bar) is heated per minute by
means of hot water spray supplied at 30°C. T he temperature of air coming out is 3 0°C and 50% R.H.
(saturat ion pressure = 0.04325 bar). T he heat added to the air will be, if atmospheric pressure is 1.033 bar

_____________kW

A bell coleman refrigeration cycle works between pressure limits of 1 bar and 5 bar. T he adiabatic efficiency of compression is 85% and expansion is 90%. Find out the tonnage capacity when the air flow rat e is 1 kg/sec. T he ambient temperat ure is 27°C and refrigerat or temperat ure is 0°C

A 100 mm diameter safet y valve is to be designed to blow off at a gauge pressure of 1.2 N/mm². T he
valve is held in position by a 180 mm diameter close coiled compression helical spring whose init ial
compression is 25 mm. What is the number of turn required if the shear stress is not to exceed 80 N/
mm² if G = 8.5 × 10⁴ N/mm²

^{__________________}

A pelton wheel 2.5 m diameter operates under the following conditions

Find the hydraulic efficiency _________________%

A cantilever beam is loaded as shown below

T he deflect ion of the free end will be

A pipe carry water has a tapering section where the diameter changes from 10.0 cm at section 'A' to 8.0 cm
at section 'B'. T he flow is from 'A' to 'B' and the pressure and elevation at t hese section are as follow

Find the discharge in the pipe

 _______________________ L/s.

A thick walled cop per cylinder has an inside radius of 1 cm and an outside radius of 2 cm. T he inner and
outside surfaces are held at 310°C and 290°C respectively. Assume 'k' varie with temperature as k = 371.9
[1 – 9.25 × 10^–5(T – 150)] W/mK. Determine the heat lost per unit length

_______________ kW/m

T he rat io of the solidification time of two cylindrical risers of sizes 30 cm in diameter × 60 cm in height and
60 cm in diameter × 30 cm in height subjected to identical conditions of cooling

In an experiment to determine the thermal conductivity of a long solid 2.5 cm diameter rod, its base is place
in a furnace with a large portion of it projecting in to the room air at 22°C. Aft er stea dy state condition
prevail, t he temp eratrue at two point s, 10 cm apar t are found to be 110°C and 85°C respectively. T he
convective heat t ransfer coefficient between the rod surface and the surrounding air is 28.4 W/m²K.
Determine the t hermal conductivit y of the rod material _________________ W/mK

T he vapour compression Refrigerat ion cycle is represented as shown in figure below with state (1) being
the exit of the evaporator. T he coordinate system used in this figure is

The atmospheric air at 760 mm of Hg. dry bulb temperat ure 15°C and wet bulb temperat ure 11°C enters a
heating coil whose temperature is 41°C. If the by-pass factor of the heating coil is 0.5. T hen what will be the
dry bulb temperat ure of air leaving the coil 2.

T he modulus pa rt of (1 + i)⁸ is ______________

If a vector    The divergence of vector  is

Using Sim pson’s 1/3 rd rule with step size of .1, the value of  is _______________.

The solution of the differential equation  is

Find the v alue of λ and μ for which system of equations

x + λy + z = 3
x + 2y + 2z = μ
x + 5y + 3z = 9
has infinit e consistent solution.