GATE 2021 ME : Toppers Quiz 17 (App update required to attempt this test) for ESE & GATE ME Exams

Question 1

Two walls of same thickness and cross-sectional area have thermal conductivities in the ratio 1 : 2. If the same temperature difference difference is maintained across the two faces of both the walls, what is the ratio of heat flow

?

Question 2

According to Lami’s theorem:

Question 3

Gibbs free energy (G) is given by____.

Question 4

A nail of mass 0.015 kg is driven into a fixed wooden block, Its initial speed is 25 m/s and it is brought to rest in 6 milliseconds. find the value of the force

Question 5

Die casting is good because it has

Question 6

The deformation of a bar under its own weight as compared to that when subjected to a direct axial load equal to its own weight will be

Question 7

Match List-I (Prime mover) with List-II (Air standard cycles) and select the correct answer using the code given below the lists:
List-i
A). High speed diesel engine
B). IC engine having expansion ratio greater than compression ratio
C). Pulse jet engine
D). Gas turbine with multi-stage compression and multi-stage expansion
List-ii
1). Atkinson cycle
2). Dual combustion (limited pressure) cycle
3). Ericsson cycle
4). Lenoir cycle

Question 8

Which of the following statement is false?

Question 9

The temperature strain is a function of
1) Coefficient of linear expansion
2) Temperature rise
3) Modulus of elasticity

Question 10

What is an azeotrope?

Question 11

A hole of diameter (d) is to be punched through a sheet metal of thickness (t). How much force is required to punch the hole if the ultimate shear stress of the sheet metal is (τ)?

Question 12

In sheet metal working, shear is provided on punches and dies so that:

Question 13

Resistance spot welding is performed on two plates of 1.5 mm thickness with 6 mm diameter electrode, using 15000 A current for a time duration of 0.25 seconds. Assuming the interface resistance to be 0.0001Ω, the heat generated( W-sec) to form the weld is

Question 14

Step angle of the stepper motor is

degrees per pulse and the pitch of lead screw is p mm. If gear ratio is G, then number of pulses required to achieve a linear movement of x mm is,

Question 15

The dimension limits on a shaft of 25 h₇ are

Question 16

In a certain ECM operation, the frontal working area of the electrode is 2000

. The applied current and voltage are 1800 A and 12 V respectively. The material being machined is Nickel (Valency 2) whose specific material rate C=3 .42x

. The efficiency of the process is 90% and the resistivity of the electrolyte is 140 ohm-mm , with an overvoltage of 1 .5 V. The MRR in

and the working gap respectively are:

Question 17

In iron-iron carbide phase diagram, what is the structure which is pure form of iron having FCC crystal structure and non-magnetic in nature

Question 18

Better surface finish is obtained with a large rake angle because

Question 19

Match the following:
List-I:
i). Die casting
ii). Shell molding
iii). CO₂ molding
iv). Centrifugal casting
List-II:
1). Phenol formaldehyde
2). CI pipes
3). Non-ferrous alloys
4). Sodium silicate

Question 20

Welding of two 8 mm thick plates placed at a distance of 20 mm is done. It is carries out at 20 V, 400 A and the heat required to melt the plate is 25 J/mm³. The melting and heat transfer efficiency are 0.625 and 0.80 respectively. Find the speed of welding _______.