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GATE 2020 :Toppers quiz 21 (App update required to attempt this test)

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Question 1

A mixture of moist air contains 20% vapor by mass and is kept in an isolated and rigid container of volume 0.85m³. If the density of fluid is 3 Kg/m³ and density of gas is 0.6 Kg/m³. Find the mass of the mixture in Kg.

Question 2

In a parallel flow heat exchanger, the inside heat transfer coefficient is 180W/

outside heat transfer coefficient is 250W/

. If the fouling factor for both inside and outside wall is 0.003

. Then overall heat transfer coefficient for the system will be

Question 3

A 140 mm diameter billet is extruded to 70 mm, at the working temperature of 800ºC. The average flow stress of material is 350 MPa, the force required for extrusion (in MN) is _____

Question 4

The ratio of volumetric strain of a thin cylinder to that of a thin spherical shell having the same internal pressure, same material and same internal diameter and thickness of spherical is twice that of cylindrical is_____ [take poisson’s ratio = 0.4]

Question 5

A mass of 2000 kg is currently being lowered at a velocity of 2 m/s from the drum as shown in the figure. The mass moment of inertia of the drum is 150 kg-m². On applying the brake, the mass is brought to rest in a distance of 0.5 m. The energy absorbed by the brake (in kJ) is

Question 6

Determine the maximum swaying couple of a two cylinder locomotive. Consider the following parameters:
Mass of reciprocating parts per cylinder = 300 kg
Distance between cylinder centre lines = 0.55 m
Crank radius = 0.2 m
Radius of wheel=0.9m
Cranks are at angles = 90 °
If the velocity of hammer blow is 80km/h and take c = 0.75

Question 7

A simply supported circular beam of diameter 30 mm uniformly loaded over the length shows the maximum deflection at centre as 7.5 mm. The beam is now replaced with another circular beam of diameter 40mm. The deflection in the current beam is

Question 8

A body acted upon by three forces

and

is in equilibrium. If the magnitude of

is 750N. Then the ratio of forces

i.e.

Question 9

Flow separation in flow past a solid object is caused by

Question 10

An eight-speed drilling machine uses drill of diameter ranging from 6mm to 36mm where the cutting speed is 15m/min. The ratio of any two consecutive speeds is

Question 11

2 moles of nitrogen

at 0.2MPa and 320K are subjected to a series of processes as a result of which it reached a state of 500kPa and 700K. The change in entropy of nitrogen is ________ kJ/K

Question 12

An ideal brayton cycle without regeneration has pressure ratio of 6. Air inlet to compressor is 0.1MPa and 30^OC. The maximum temperature that can be attained in a cycle is 900^oC.The compressor and turbine efficiencies are 0.9 and 0.95 respectively. Heat supplied per kW of output obtained____________?

Question 13

A welding operation is done with voltage and current of 60 V and 100 A.The cross section of the weld is 150 mm². And the specific energy for thus welding operation is 5.2 J/mm³. The welding speed is 6 mm/s. the supply efficiency is 90%, Find the melting efficiency in %.

Question 14

The molar specific heat at constant volume of an ideal gas is equal to 2.5 times the universal gas constant (8.314 J/mol.K). When the temperature increases by 100k, the change in molar specific enthalpy is ________ J/mol.

Question 15

For fully developed flow through a pipe, the wall temperature is maintained at 500°C. If the fluid has thermal conductivity of 0.12 W/m-K and diameter of pipe is 15 cm, then the heat transfer coefficient (in W/m²K) will be _____.

Question 16

An engine is working on air-std diesel cycle. The engine has bore 300mm, stroke 370 mm and clearance volume is 1550 cm³. If the cut-off value is 5% of stroke volume the efficiency of engine will be

Question 17

Cinsider the 2-D steady flow field

V=(2xy-5y²)i+(4x²+3xy)j

The number of stagnation points in the flow field is

Question 18

A cantilever beam is made up of two different materials as shown. Material AB has flexural rigidity EI while theoretical flexural rigidity of section BC is infinite. The deflection at the end is

Question 19

An ECM process is carried out with an iron plate (atomic weight=56gm, valency =2) with an electric current of 480 Ampere. The density of the iron is equal to 7.6 gm/cm³. Using faraday law of electrolysis, Find the material removal rate in ______ cm³/sec.

Question 20

The following table shows the grade points in each subject in different semesters. A student has to select one and only one elective in each semester and same elective should not be selected in different semester.

The maximum expected total points is

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