Mechanical Engineering Gate Yearwise 


Mechanical Engineering Gate 2014 Set-4 Questions with Answer

Ques 27 GATE 2014 Set-4

A flow field which has only convective acceleration is

A

a steady uniform flow

B

an unsteady uniform flow

C

a steady non-uniform flow

D

an unsteady non-uniform flow


(c) is the correct answer.

Ques 28 GATE 2014 Set-4

Match Group A with Group B:

Group AGroup B
P: Biot number1: Ratio of buoyancy to viscous force
Q: Grashof number2: Ratio of inertia force to viscous force
R: Prandtl number3: Ratio of momentum to thermal diffusivities
S: Reynolds number4: Ratio of internal thermal resistance to boundary layer thermal resistance

A

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

B

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

C

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

D

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


(a) is the correct answer.

Ques 29 GATE 2014 Set-4

Kaplan water turbine is commonly used when the flow through its runner is

A

axial and the head available is more than 100 m

B

axial and the head available is less than 10 m

C

radial and the head available is more than 100 m

D

mixed and the head available is about 50 m


(b) is the correct answer.

Ques 30 GATE 2014 Set-4

Moist air at 35°C and 100% relative humidity is entering a psychrometric device and leaving at 25°C and 100% relative humidity. The name of the device is

A

Humidifier

B

Dehumidifier

C

Sensible heater

D

Sensible cooler


(b) is the correct answer.

Ques 31 GATE 2014 Set-4

The total number of decision variables in the objective function of an assignment problem of size n×n (n jobs and n machines) is

A

n2

B

2n

C

2n-1

D

n


(a) is the correct answer.

Ques 32 GATE 2014 Set-4

Demand during lead time with associated probabilities is shown below:

Demand5070758085
Probability0.150.140.210.200.30

Expected demand during lead time is ________.


(74.55) is the correct answer.

Ques 33 GATE 2014 Set-4

Within the Heat Affected Zone (HAZ) in a fusion welding process, the work material undergoes

A

microstructural changes but does not melt

B

neither melting nor microstructural changes

C

both melting and microstructural changes after solidification

D

melting and retains the original microstructure after solidification


(a) is the correct answer.

Ques 34 GATE 2014 Set-4

Two separate slab milling operations, 1 and 2, are performed with identical milling cutters. The depth of cut in operation 2 is twice that in operation 1. The other cutting parameters are identical. The ratio of maximum uncut chip thicknesses in operations 1 and 2 is ________.


(0.707) is the correct answer.

Ques 35 GATE 2014 Set-4

The principle of material removal in Electrochemical machining is

A

Fick's law

B

Faraday's laws

C

Kirchhoff's laws

D

Ohm's law


(b) is the correct answer.

Ques 36 GATE 2014 Set-4

Better surface finish is obtained with a large rake angle because

A

the area of shear plane decreases resulting in the decrease in shear force and cutting force

B

the tool becomes thinner and the cutting force is reduced

C

less heat is accumulated in the cutting zone

D

the friction between the chip and the tool is less


(a) is the correct answer.

Ques 37 GATE 2014 Set-4

Match the heat treatment processes (Group A) and their associated effects on properties of medium carbon steel (Group B)

Group AGroup B
P: TemperingI: Strengthening and grain refinement
Q: QuenchingII: Inducing toughness
R: AnnealingIII: Hardening
S: NormalizingIV: Softening

A

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

B

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

C

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

D

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


(b) is the correct answer.

Ques 38 GATE 2014 Set-4

In a rolling process, the maximum possible draft, defined as the difference between the initial and the final thickness of the metal sheet, mainly depends on which pair of the following parameters?
P: Strain
Q: Strength of the work material
R: Roll diameter
S: Roll velocity
T: Coefficient of friction between roll and work

A

Q, S

B

R, T

C

S, T

D

P, R


(b) is the correct answer.

Ques 39 GATE 2014 Set-4

A shaft is subjected to pure torsional moment. The maximum shear stress developed in the shaft is 100 MPa. The yield and ultimate strengths of the shaft material in tension are 300 MPa and 450 MPa, respectively. The factor of safety using maximum distortion energy (von-Mises) theory is ________.


(1.732) is the correct answer.

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