Mechanical Engg. Set-1 GATE (2015)

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Directions: Carry One Mark Each.

Which of the following is an adverb?

  1. Misogynousness

  2. Misogynity

  3. Misogynously

  4. Misogynous


Correct Option: C
Explanation:

Correct Answer: Misogynously

Directions: Carry One Mark Each.

If a2 + b2 + c2 = 1, then ab + bc + ac lies in the interval

  1. $\bigg[1, \frac{2}{3} \bigg]$

  2. $\bigg[\frac{-1}{2} , 1\bigg]$

  3. $\bigg[-1, \frac{1}{2} \bigg]$

  4. [2, –4]


Correct Option: B
Explanation:

Directions: Carry One Mark Each.

Ram and Ramesh appeared in an interview for two vacancies in the same department. The probability of Ram’s selection is $\frac{1}{6}$ and that of Ramesh's selection is $\frac{1}{8}$. What is the probability that only one of them will be selected?

  1. $\frac{47}{48}$

  2. $\frac{1}{4}$

  3. $\frac{13}{48}$

  4. $\frac{35}{48}$


Correct Option: B
Explanation:

Directions: Carry One Mark Each.

In the following sentence, certain parts are underlined and marked P, Q and R. One of the parts may contain certain error or may not be acceptable in standard written communication. Select the part containing an error. Choose (4) as your answer if there is no error.

The student corrected $\frac{\text{all the errors}}{P}$ that $\frac{\text{the instructor marked}}{Q}$ on the $\frac{\text{answer book}}{R}$.

  1. P

  2. Q

  3. R

  4. No error


Correct Option: B
Explanation:

In part Q, the is not required.

Directions: Carry Two Marks Each.

Lamenting the gradual sidelining of arts in school curricula, a group of prominent artists wrote to the Chief Minister last year, asking him to allocate more funds to support arts education in schools. However, no such increase has been announced in this year’s budget. The artists expressed their deep anguish at their request not being approved, but many of them remain optimistic about funds coming in the future.

Which of the following statements are logically valid and can be inferred from the above statements?

I. The artists expected funding for arts to increase this year. II. The Chief Minister was receptive to the idea of increasing funding for arts. III. The Chief Minister is a prominent artist. IV. Schools are giving less importance to arts education nowadays.

  1. III and IV

  2. I and IV

  3. II, III and IV

  4. I and III


Correct Option: B
Explanation:

Correct Answer: I and IV

Directions: Carry Two Marks Each.

Given below are two statements followed by two conclusions. Assuming these statements to be true, decide which conclusion(s) logically follow(s).

Statements: All film stars are playback singers. All film directors are film stars. Conclusions: I. All film directors are playback singers. II. Some film stars are film directors.

  1. Only conclusion I follows

  2. Only conclusion II follows

  3. Neither conclusion I nor II follows

  4. Both conclusions I and II follow


Correct Option: D
Explanation:

Directions: Carry One Mark Each.

Choose the appropriate word/phrase out of the four options given below to complete the following sentence.

Dhoni, as well as the other team members of the Indian team, _________ present on the occasion.

  1. were

  2. was

  3. has

  4. have


Correct Option: B
Explanation:

Here, the focus of sentence is on Dhoni, not team members. Because the team phrase can be omitted from the sentence, it will be was and not were.

Directions: Carry One Mark Each.

An electric bus has on-board instruments that report the total electricity consumed since the start of the trip as well as the total distance covered. During a single day of operation, the bus travels on stretches M, N, O and P, in that order. The cumulative distance travelled and the corresponding electricity consumption are shown in the table below. Stretch| Cumulative distance (km)| Electricity used (kWh) | | M| 20|12| | N| 45| 25| | O| 75| 45| | P| 100| 57|

Which of the following is the stretch where the electricity consumption per km is the minimum?

  1. M

  2. N

  3. O

  4. P


Correct Option: D
Explanation:

Directions: Carry One Mark Each.

Choose the word which is most similar in meaning to the given word.

Awkward

  1. Inept

  2. Graceful

  3. Suitable

  4. Dreadful


Correct Option: A
Explanation:

(A) Inept Showing a lack of judgment, sense or reason; inappropriate or foolish. Synonyms of inept: Awkward, clumsy or incompetent (B) Graceful having or showing grace or elegance Synonyms of graceful: elegant, stylish, sophisticated, etc. (C) Suitable Right or appropriate for a particular person, purpose or situation Synonyms of suitable: acceptable, satisfactory, fit, etc. (D) Dreadful Causing or involving great suffering, fear or unhappiness, extremely bad or serious Synonyms of Dreadful: terrible, frightful, awful, etc.

The function of interpolator in a CNC machine controller is to

  1. control spindle speed

  2. coordinate feed rates of axes

  3. control tool rapid approach speed

  4. perform miscellaneous (M) functions (tool change, coolant control, etc.)


Correct Option: B
Explanation:

Interpolator in a CNC machine controller is used for circular interpolation purpose. It simply means that interpolator gives motion (or feed) to the coordinate axes for circular interpolations. Some of the circular interpolation codes are given as follows: GO2 = Circular interpolation, clockwise GO3 = Circular interpolation, counter clockwise

If any two columns of a determinant P = $\begin{vmatrix} \ 4 & 7 & 8 \ \ 3 & 1 & 5 \ \ 9 & 6 & 2 \ \end{vmatrix}$are interchanged, which of the following statements regarding the value of the determinant is correct?

  1. The absolute value remains unchanged, but the sign will change.

  2. Both the absolute value and the sign will change.

  3. The absolute value will change, but the sign will not change.

  4. Both the absolute value and the sign will remain unchanged.


Correct Option: A
Explanation:

It is the fundamental property of determinant that when any two columns or rows of a determinant are interchanged, then the absolute value remains unchanged, but the sign will change.

For an ideal gas with constant values of specific heats and calculation of specific enthalpy,

  1. it is sufficient to know only the temperature

  2. both temperature and pressure are required to be known

  3. both temperature and volume are required to be known

  4. both temperature and mass are required to be known


Correct Option: A
Explanation:

Consider fully-developed flow in a circular pipe with negligible entrance length effects. Assuming the mass flow rate, density and friction factor to be constant, if the length of the pipe is doubled and the diameter is halved, the head loss due to friction will increase by a factor of

  1. 4

  2. 6

  3. 32

  4. 64


Correct Option: D
Explanation:

Which of the following types of stress-strain relationships best describes the behaviour of brittle materials, such as ceramics and thermosetting plastics? ($\sigma$ = stress and $\epsilon$ = strain)


Correct Option: D
Explanation:

We know that brittle materials do not show elongation when external load is applied on them and they get altered by certain amount of load and thus, get cracked from unexpected points. The amount of ultimate load and point of fracture cannot be predetermined and elongation is also very, very less. These properties are best described by option (4).

Holes of diameter 25.0$+0.040\\ +0.020$mm are assembled interchangeably with the pins of diameter 25.0$+0.005\\ -0.008$mm. The minimum clearance in the assembly will be

  1. 0.048 mm

  2. 0.015 mm

  3. 0.005 mm

  4. 0.008 mm


Correct Option: B
Explanation:

The value of $lim_{x \rightarrow0}\frac{1-cos(x^2)}{2x^4}$ is

  1. 0

  2. $\frac{1}{2}$

  3. $\frac{1}{4}$

  4. undefined


Correct Option: C
Explanation:

Among the four normal distributions with probability density functions as shown below, which one has the lowest variance?

  1. I

  2. II

  3. III

  4. IV


Correct Option: D
Explanation:

The Blasius equation related to boundary layer theory is a

  1. third-order linear partial differential equation

  2. third-order nonlinear partial differential equation

  3. second-order nonlinear ordinary differential equation

  4. third-order nonlinear ordinary differential equation


Correct Option: D
Explanation:

$\text{The blausius equation related to boundary layer theory is}\\ f'''+\frac{1}{2}ff''=0\\ \text{ It is a third order non-linear ordinary differential equation}$

Which of the following is the most conservative fatigue failure criterion?

  1. Soderberg

  2. Modified Goodman

  3. ASME elliptic

  4. Gerber


Correct Option: A
Explanation:

Consider a slider crank mechanism with non-zero masses and inertia. A constant torque T is applied on the crank, as shown in the figure. Which of the following plots best resembles variation of crank angle, $\theta$ versus time?


Correct Option: D
Explanation:

Correct Answer:

For the flow of viscous fluid over a flat plate, if the fluid temperature is the same as the plate temperature, the thermal boundary layer is

  1. thinner than the velocity boundary layer

  2. thicker than the velocity boundary layer

  3. of the same thickness as the velocity boundary layer

  4. not formed at all


Correct Option: D
Explanation:

For the flow of viscous fluid over a flat plate, if the fluid temperature is the same as the plate temperature, the thermal boundary layer is not formed at all because boundary layer formation takes place if there is some difference in fluid property of no slip layer and the remaining fluid. As given here, fluid is viscous and flowing over a flat plate. Here, definitely a kinematic boundary layer will be formed, but as there is no temperature difference, so no formation of thermal boundary layer.

In a linear arc welding process, the heat input per unit length is inversely proportional to

  1. welding current

  2. welding voltage

  3. welding speed

  4. duty cycle of the power source


Correct Option: C
Explanation:

A 10 mm diameter electrical conductor is covered by an insulation of 2 mm thickness. The conductivity of the insulation is 0.08 W/m-K and the convection coefficient at the insulation surface is 10 W/m2-K. Addition of further insulation of the same material will

  1. increase heat loss continuously

  2. decrease heat loss continuously

  3. increase heat loss to a maximum and then decrease heat loss

  4. decrease heat loss to a minimum and then increase


Correct Option: C
Explanation:

If two complex numbers Z1 = 5 + (5$\sqrt{3}$) i and $z_2=\frac{2}{\sqrt{3}}+2i$, the argument of $\frac{z_1}{z_2}$ in degrees is

  1. 0

  2. 30

  3. 60

  4. 90


Correct Option: A
Explanation:

Match the following:

   
Product Process
P Rails (1) Blow molding
Q Engine crankshaft (2) Extrusion
R Aluminium channels (3) Forging
S PET water bottles (4) Rolling
  1. P - 4, Q - 3, R - 1, S - 2

  2. P - 4, Q - 3, R - 2, S - 1

  3. P - 2, Q - 4, R - 3, S - 1

  4. P - 3, Q - 4, R - 2, S – 1


Correct Option: B
Explanation:

The solidification time of a casting is proportional to $\Big(\frac{V}{A}\Big)^{2}$ , where V is the volume of the casting and A is the total casting surface area losing heat. Two cubes of the same material and size are cast using sand casting process. The top face of one of the cubes is completely insulated. The ratio of the solidification time for the cube with top face insulated to that of the other cube is

  1. $\frac{25}{36}$

  2. $\frac{36}{25}$

  3. 1

  4. $\frac{6}{5}$


Correct Option: B
Explanation:

$\text{It is given that solidification time of casting}(t_s)\\ t_s \alpha(\frac{V}{A})^2\\ \text {where $\hspace{0.5cm}$ v = Volume of casting} \\ \hspace{1.9cm}\text{A = surface area of casting losing heat}$

Considering a massless rigid rod and small oscillations. The natural frequency (in rad/s) of vibration of the system, as shown in the figure, is

  1. $\sqrt{\frac{400}{1}}$

  2. $\sqrt{\frac{400}{2}}$

  3. $\sqrt{\frac{400}{3}}$

  4. $\sqrt{\frac{400}{4}}$


Correct Option: D
Explanation:

Match the following:

 
Equation Physical interpretation
(P) $\triangledown \times \bar{V}$ = 0 (I) Incompressible continuity equation
(Q) $\triangledown. \bar{V}$ = 0 (II) Steady flow
(R) $\frac{D\bar{v}}{Dt}=0$ (III) Irrotational flow
(S) $\frac{a\bar{V}}{at}=0$ (IV) Zero acceleration of fluid particle
  1. P - IV, Q - I, R - II, S - III

  2. P - IV, Q - III, R - I, S - II

  3. P - III, Q - I, R - IV, S - II

  4. P - III, Q - I, R - II, S - IV


Correct Option: C
Explanation:

A triangular facet in a CAD model has vertices P1(0, 0, 0); P2(1, 1, 0); and P3(1, 1, 1). The area of the facet is

  1. 0.500

  2. 0.707

  3. 1.414

  4. 1.732


Correct Option: B
Explanation:

In the assembly shown below, the part dimensions are: L1 = $22.0^{\pm 0.01}$ mm and L2 = L3 = $10.0^{\pm 0.005}$ mm Assuming the normal distribution of part dimensions, the dimension L4 (in mm) for assembly condition would be

  1. $2.0^{\pm o.008}$

  2. $2.0^{\pm o.012}$

  3. $2.0^{\pm o.016}$

  4. $2.0^{\pm o.020}$


Correct Option: D
Explanation:

Fine the solution of $\frac{d^2y}{dx^2}$ = y, which passes through the origin and the point (In 2, $\frac{3}{4}$).

  1. $y=\frac{1}{2}e^x+e^{-x}$

  2. $y=\frac{1}{2}(e^x-e^{-x})$

  3. $y=\frac{1}{2}(e^x-e^{-x})$

  4. $y=\frac{1}{2}e^x+e^{-x}$


Correct Option: A
Explanation:

A mobile phone has a small motor with an eccentric mass used for vibrator mode. The location of the eccentric mass on motor with respect to the center of gravity (CG) of the mobile and the rest of the dimensions of the mobile phone are shown. The mobile is kept on a flat horizontal surface.

In addition, eccentric mass = 2 grams, eccentricty = 2.19 mm, mass of the mobile = 90 grams and g = 9.81 m/s2. Uniform speed (in RPM) of the motor for which the mobile will get just lifted off the ground at the end Q is approximately

  1. 3000

  2. 3500

  3. 4000

  4. 4500


Correct Option: B
Explanation:

Correct Answer: 3500

For flow through a pipe of radius R, the velocity and temperature distributions are as follow: u(r, x) = C1 and T(r, x) C2 $\bigg[1-(\frac{r}{R})^3\bigg]$, where C1 and C2 are constants. The bulk mean temperature is given by $T_m = \frac{2}{u_mR^2} \int\limits_0^R u(r, x)T (r, x) r dr$, with Um being the mean velocity of flow. The value of Tm is

  1. $\frac{0.5C_2}{U_m}$

  2. 0.5 C2

  3. 0.6C2

  4. $\frac{0.6C_2}{U_m}$


Correct Option: C
Explanation:

Following data refers to the activities of a project, where node 1 refers to the start and node 5 refers to the end of the project.

 
Activity Duration (days)
1-2 2
2-3 1
4-3 3
1-4 3
2-5 3
3-5 2
4-5 4

The critical path (CP) in the network is

  1. 1 – 2 – 3 – 5

  2. 1 – 4 – 3 – 5

  3. 1 – 2 – 3 – 4 – 5

  4. 1 – 4 – 5


Correct Option: B
Explanation:

For the truss shown in the figure, the magnitude of the force in member PR and the support reaction at R respectively are

  1. 122.47 kN and 50 kN

  2. 70.71 kN and 100 kN

  3. 70.71 kN and 50 kN

  4. 81.65 kN and 100 kN


Correct Option: C
Explanation:

A pinion with radius r1 and inertia l1 is driving a gear with radius r2 and inertia I2. Torque $\tau$1 is applied on pinion. The following are free body diagrams of pinion and gear showing important forces (F1 and F2) of interaction. Which of the following holds true?

  1. F1 $ \neq$F2; ; F2 =

  2. F1 = F2; ; F2 =

  3. F1 = F2; ; F2 =

  4. F1 $ \neq$F2; ; F2 =


Correct Option: B
Explanation:

The probability of obtaining at least two ‘‘six’’ in throwing a fair dice 4 times is

  1. $\frac{425}{432}$

  2. $\frac{19}{144}$

  3. $\frac{13}{144}$

  4. $\frac{125}{432}$


Correct Option: B
Explanation:

A machine element is subjected to the following bi-axial state of stress: $\sigma_y=20$ MPa; $\tau_{xy}=40$ MPa If the shear strength of the material is 100 MPa, the factor of safety as per Tresca’s maximum shear stress theory is

  1. 1.0

  2. 2.0

  3. 2.5

  4. 3.3


Correct Option: B
Explanation:

$= \frac{100}{50}=2\\ \text{So factor of safety according to Tresca's maximum shear stress theory is 2.}$

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