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GATE 2021 ME : Toppers Quiz 25 (App update required to attempt this test)

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Question 1

The stresses encountered in metal forming processes, are ________.

Question 2

Perpetual motion machine of second kind violates the __________.

Question 3

In the subsonic flow through a convergent nozzle , the velocity _________.

Question 4

A system of masses rotating in different parallel planes in dynamic balance if –

Question 5

A vibrating system with mass 4kg and stiffness 36N/m and a damper has a damping coefficient of 12 Ns/m. Calculate the time period of oscillation (s) when an exciting force of 27sin3t is applied. (Take 0.866² = 0.75).

Question 6

The area of a Mohr’s circle is 154square cm. If the circle is centered at (6,0) and the scaling parameter used is 1cm = 10MPa, then calculate the major principal stress.

Question 7

In reaction turbine the fixed blade

Question 8

A batsman knocks back a ball straight in the direction towards the bowler without altering its initial speed of 12 m/s.If the mass of the ball is 0.15 kg, the magnitude of impulse (in Ns)imparted to the ball is ___.

Question 9

Only rocket engines can be propelled to space because ________.

Question 10

The diameter of droplet is 0.05mm. What is the intensity of the pressure (N/sq.cm) developed in the droplet by surface tension of 0.00005 N/mm?

Question 11

The uniform rod in figure weighs 400 N, length of the rod is 12 m

Determine the angle ɵ in degrees.

Question 12

A single point cutting tool with 0°rake angle is used in an orthogonal machining process. At a cutting speed of 180 m/min. the thrust force is 490 N. If the coefficient of friction between the tool and the chip is 0.7, then the power consumption (in kW) for the machining operation is _______

Question 13

A rigid tank contains 2.5 kg of refrigerant R-12 initially at 35°C & 170 kPa. The refrigerant is now cooled until its pressure drops to 110 kPa. The entropy change in (kJ/k) of the refrigerant during the process is –

Use the following data :

At P₁ = 170 kPa S₁ = 1.1375 kJ/kg.k

V₁ = 0.17634 m³/kg

At P₂ = 110 kPa,

[–0.68 to – 0.70]

Question 14

Match list-I (Surface with orientations) with List-II (Equivalent emissivity) and select the correct answer using the codes given below the lists :
List-I
A- Infinite parallel planes
B- Body 1 completely enclosed by body 2 but body 1 is very small
C- Radiation exchange between two small gray bodies.
D- Two concentric cylinders with large lengths.
List-II
1- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image024.png$
2- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image025.png$
3- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image026.png$
4- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image027.png$

Question 15

Moist air is treated as an ideal gas mixture of water vapor and dry air (molecular weight of air = 28.84 and molecular weight of water = 18). At a location, the total pressure is 100 kPa, the temperature is 30 °C and the relative humidity is 55%. Given that the saturation pressure of water at 30 °C is 4246 Pa, the mass of water vapor per kg of dry air is _____________ grams

Question 16

A reversible heat engine receives 2 kJ of heat from a reservoir at 1000 K and a certain amount of heat from a reservoir at 800 K. It rejects 1 kJ of heat to a reservoir at 400 K. The net work output (in kJ) of the cycle is

Question 17

A job having a processing time of 11 days is to be processed in scheduling operation. The job is to be delivered on 18^th july 2018 but the job is received on 7^th july. Find the critical ratio of the job to be processed.

Question 18

A project has seven activities each with totally deterministic completion time.

The project completion time (days) and total float (days) on activity ‘F’ respectively are

Question 19

The tool life equation for HSS tool is VT^0.14f ^0.7d^0.4 = Constant. The tool life (T) of 30 min is obtained using the following cutting conditions:
V = 45 m/min, f = 0.35 mm, d = 2.0 mm
If speed (V), feed (f) and depth of cut D. are increased individually by 25%, the tool life (in min) is

Question 20

The radius of gyration of a double symmetric cross-section pinned-pinned column is 350mm. The distance between two point of contraflexure along its length is 10m. The slenderness ratio of the given column is _____.(correct to two decimal place)

Question 21

At a point in a material there are two direct stresses of 60 MPa tensile and 50 MPa compressive acting at right angles to each other. The greatest principal stress in the material is limited to 125 MPa in tension. What will be maximum shearing stress to which the material can be subjected on the given plane __________.

Question 22

In electrochemical machining the material removed from iron (atomic weight 56 valancy =2) following data has been taken:
Density = 7.8gram/cc
MRR = 5cc/minute
Specific material removal rate and desired current respectively:

Question 23

In an interchangeable assembly, shafts of size $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE ME 18-Mar\GATE-ME-2004_files\image098.png$ mm mate with holes of size $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE ME 18-Mar\GATE-ME-2004_files\image099.png$ mm. The maximum possible clearance in the assembly will be

Question 24

A 50 cm diameter pipeline carries hot oil at 30^oC and is exposed to a surrounding temperature of -20^oC . A special 5cm thick power insulation surrounds the pipe and has a thermal conductivity of 7 × 10^-3 W/m-^oC, what will be the energy loss from the pipe per meter of length if the pipe is urrounded by a fluid having heat transfer coefficient h = 9 W/m²^oC)

Question 25

Determine the force in the member DB

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