# Gate-Engineering GATE 2017/2018 Aeronautical Sample Test,Sample questions

## Question: ` A rocket is to be launched from the bottom of a very deep crater on Mars for earth return. The specific impulse of the rocket, measured in seconds, is to be normalized by the acceleration due to gravity at`

1.the bottom of the crater on Mars.

2.Mars standard sea level"Â.

3.earth's standard sea level.

4.the same depth of the crater on earth.

## Question: ``` A thin-walled spherical vessel (1 m inner diameter and 10 mm wall thickness) is made of a material with |ÃÆ’Y| = 500MPa in both tension and compression. If the vessel is evacuated (internal pressure = 0) and subjected to external pressure, yielding according to the von Mises yield criterion (assuming elastic stability until yield)```

1.occurs at about half the pressure pY

2.occurs at about double the pressure pY.

3.occurs at about the same pressure pY.

4.never occurs.

1.0.4 m

2.1.4 m

3.2.4 m

4.3.4 m

1.13 to 14

2. 14 to 15

3.15 to 16

4.16 to 17

## Question: ``` An oblique shock wave with a wave angle ÃŽÂ² is generated from a wedge angle of ÃŽÂ¸. The ratio of the Mach number downstream of the shock to its normal component is ```

1.sin(ÃŽÂ²"â€œÃŽÂ¸)

2.cos(ÃŽÂ²"â€œÃŽÂ¸)

3. sin(ÃŽÂ¸"â€œÃŽÂ²)

4. cos(ÃŽÂ¸"â€œÃŽÂ²)

1.reflective

2.utopian

3.luxuriant

4.unpopular

1.intrepidity

2.inevitability

3.inability

4.inertness

1. 1/s(ms2 + k)

2.1/ms2 + k

3.s/ms2 + k

4.1/s2(ms2 + k)

## Question: ` In a closed-circuit supersonic wind tunnel, the convergent-divergent (C-D) nozzle and test section are followed by a C-D diffuser to swallow the starting shock. Here, we should have the`

1.diffuser throat larger than the nozzle throat and the shock located just at the diffuser throat

2. diffuser throat larger than the nozzle throat and the shock located downstream of the diffuser throat.

3.diffuser throat of the same size as the nozzle throat and the shock located just at the diffuser throat.

4.diffuser throat of the same size as the nozzle throat and the shock located downstream of the diffuser throat.

## Question: ` In a semi-monocoque construction of an aircraft wing, the skin and spar webs are the primary carriers of`

1.shear stresses due to an aerodynamic moment component alone.

2.normal (bending) stresses due to aerodynamic forces.

3.shear stresses due to aerodynamic forces alone.

4.shear stresses due to aerodynamic forces and a moment component.

## Question: ``` In an aircraft, the dive manoeuvre can be initiated by ```

1. reducing the engine thrust alone

2. reducing the angle of attack alone

3.generating a nose down pitch rate.

4.increasing the engine thrust alone.

## Question: ` In the early nineteenth century, theories of social evolution were inspired less by Biology than by the conviction of social scientists that there was a growing improvement in social institutions. Progress was taken for granted and social scientists attempted to discover its laws and phases. Which one of the following inferences may be drawn with the greatest accuracy from the above passage? Social scientists`

1.did not question that progress was a fact.

2.did not approve of Biology.

3.framed the laws of progress

4.emphasized Biology over Social Sciences.

1.12

2.40

3.50

4.60

## Question: ` The critical Mach number of an airfoil is attained when`

1. the freestream Mach number is sonic.

2.the freestream Mach number is supersonic.

3.the Mach number somewhere on the airfoil is unity.

4. the Mach number everywhere on the airfoil is supersonic.

1.Ae-t + Be2t

2.Ae-2t + Be-t

3. Ae-2t + Bet

4. Aet + Be2t

1.0.5

2.1.0

3.1.5

4.2.0

## Question: ``` The nth derivative of the function y = 1/(x + 3) is ```

1.[(-1)n n!]/(x + 3)n+1

2.[(-1)n+1 n!]/(x + 3)n+1

3. [(-1)n (n+1)!]/(x + 3)n

4. [(-1)n n!]/(x + 3)n

1.0.0

2.0.5

3.1.0

4.2.0

1.1.65 m3

2. 1.75 m3

3.1.85 m3

4.1.95 m3

1.1430 to 1440

2.1540 to 1550

3.1380 to 1390

4.1311 to 1312

1. 35 mm

2. 38 mm

3.41 mm

4.45 mm

## Question: `A spring-mass system is viscously damped with a viscous damping constant c. The energy dissipated per cycle when the system is undergoing a harmonic vibration X CosÃâ€°dt is given by`

1.Ãâ‚¬cÃâ€°d X2

2.Ãâ‚¬Ãâ€°d X2

3. Ãâ‚¬cÃâ€°d X

4. Ãâ‚¬cÃâ€°2d X

1.0.01 m/s

2.0.1 m/s

3. 1 m/s

4.10 m/s

1.500MPa

2.500MPa

3.100MPa

4.20MPa

1.0.1 m/s

2.1 m/s

3.10 m/s

4.100 m/s

1.Ã¢Ë†â€™1.4o

2. Ã¢Ë†â€™0.4o

3. 0.4o

4.1.4o

## Question: ```An aircraft in a steady climb suddenly experiences a 10% drop in thrust. After a new equilibrium is reached at the same speed, the new rate of climb is ```

1.lower by exactly 10%

2.lower by more than 10%.

3.lower by less than 10%.

4.an unpredictable quantity.

## Question: ```An aircraft in trimmed condition has zero pitching moment at ```

1.its aerodynamic centre

2. its centre of gravity.

3.25% of its mean aerodynamic chord

4.50% of its wing root chord.

## Question: `An aircraft is trimmed straight and level at true air speed (TAS) of 100 m/s at standard sea level (SSL). Further, pull of 5 N holds the speed at 90 m/s without re-trimming at SSL (air density = 1.22 kg/m3). To fly at 3000 m altitude (air density = 0.91 kg/m3) and 120 m/s TAS without re-trimming, the aircraft needs`

1.1.95 N upward force

2.1.95 N downward force.

3.1.85 N upward force

4.1.75 N downward force.

1.0.5 to 0.7

2. 2.1 to 2.2

3.1.1 to 1.2

4.1.2 to 1.3

## Question: `Bernoulli's equation is valid under steady state`

1.nly along a streamline in inviscid flow, and between any two points in potential flow.

2.between any two points in both inviscid flow and potential flow.

3.between any two points in inviscid flow, and only along a streamline in potential flow.

4.only along a streamline in both inviscid flow and potential flow.

## Question: `Buckling of the fuselage skin can be delayed by`

1.increasing internal pressure.

2.placing stiffeners farther apart.

3. reducing skin thickness.

4.placing stiffeners farther and decreasing internal pressure.

## Question: ```Choose the most appropriate alternative from the options given below to complete the following sentence: Food prices ___ again this month. ```

1. have raised

2.have been raising

3.have been rising

4.have arose

## Question: ```Choose the most appropriate alternative from the options given below to complete the following sentence: I ___ to have bought a diamond ring.```

1.have a liking

2.should have liked

3.would like

4.may like

## Question: ```During the ground roll manoeuvre of an aircraft, the force(s) acting on it parallel to the direction of motion ```

1.is thrust alone

2.is drag alone

3.are both thrust and drag

4.are thrust, drag and a part of both weight and lift.

1. "â€œ 1.0

2.0.0

3.0.5

4.1.0

## Question: `If a prime number on division by 4 gives a remainder of 1, then that number can be expressed as`

1.sum of squares of two natural numbers

2. sum of cubes of two natural numbers

3.sum of square roots of two natural numbers

4.sum of cube roots of two natural numbers

## Question: ```If an aircraft takes off with 10% less fuel in comparison to its standard configuration, its range is ```

1.lower by exactly 10%.

2. lower by more than 10%.

3.lower by less than 10%.

4. an unpredictable quantity.

## Question: ```In an aircraft, constant roll rate can be produced using ailerons by applying ```

1.a step input.

2. a ramp input

3.a sinusoidal input

4.an impulse input.

## Question: ```In an aircraft, elevator control effectiveness determines ```

2.rate of climb

3.forward-most location of the centre of gravity

4.aft-most location of the centre of gravity

## Question: ```The Airy stress function, Ãâ€  =ÃŽÂ± x2 +ÃŽÂ² xy +ÃŽÂ³ y2 for a thin square panel of size l Ãƒâ€”l automatically satisfies compatibility. If the panel is subjected to uniform tensile stress, ÃÆ’o on all four edges, the traction boundary conditions are satisfied by ```

1.ÃŽÂ± =ÃÆ’o /2 ; ÃŽÂ² = 0; ÃŽÂ³ =ÃÆ’o /2.

2.ÃŽÂ± =ÃÆ’o; ÃŽÂ² = 0; ÃŽÂ³ =ÃÆ’oC.

3. ÃŽÂ± = 0; ÃŽÂ² =ÃÆ’o / 4; ÃŽÂ³ = 0

4.ÃŽÂ± = 0; ÃŽÂ² =ÃÆ’o / 2; ÃŽÂ³ = 0

1.1/2

2.2

3.1/âˆš2

4.âˆš2

## Question: ```The constraint A2 = A on any square matrix A is satisfied for ```

1. the identity matrix only

2.the null matrix only.

3.both the identity matrix and the null matrix

4.no square matrix A.

## Question: ```The general solution of the differential equation dy/dx - 2âˆšy = 0 is ```

1.y Ã¢Ë†â€™ âˆšx + C = 0

2.y Ã¢Ë†â€™ x + C = 0

3.âˆšy Ã¢Ë†â€™ âˆšx + C = 0

4.âˆšy Ã¢Ë†â€™ x + C = 0

## Question: `The governing equation for the static transverse deflection of a beam under an uniformly distributed load, according to Euler-Bernoulli (engineering) beam theory, is a`

1.The governing equation for the static transverse deflection of a beam under an uniformly distributed load, according to Euler-Bernoulli (engineering) beam theory, is a

2.4th order linear non-homogeneous ordinary differential equation.

3.2nd order linear non-homogeneous ordinary differential equation.

4.4th order nonlinear homogeneous ordinary differential equation.

## Question: ```The Hohmann ellipse used as earth-Mars transfer orbit has ```

1.apogee at earth and perigee at Mars

2. both apogee and perigee at earth.

3.apogee at Mars and perigee at earth

4.both apogee and perigee at Mars.

1.0.25

2.0.50

3.0.75

4.1.0

1.30o

2.45o

3.60o

4. 90o

1.1

2.4

3.5

4.2

## Question: ```The Poisson's ratio,ÃŽÂ½ of most aircraft grade metallic alloys has values in the range: ```

1.Ã¢Ë†â€™1 Ã¢â€°Â¤ÃŽÂ½ Ã¢â€°Â¤0

2.0 Ã¢â€°Â¤ ÃŽÂ½ Ã¢â€°Â¤0.2

3.0.2 Ã¢â€°Â¤ÃŽÂ½ Ã¢â€°Â¤0.4

4.0.4 Ã¢â€°Â¤ÃŽÂ½ Ã¢â€°Â¤0.5

1.315 km

2.335 km

3.365 km

4.385 km

## Question: `The shadowgraph flow visualization technique depends on`

1.the variation of the value of density in the flow.

2.the first derivative of density with respect to spatial coordinate.

3.the second derivative of density with respect to spatial coordinate

4. the third derivative of density with respect to spatial coordinate.

1.0.0018

2.0.018

3.0.18

4.1.18

1.0

2.2

3.4

4.8

## Question: ```The volume of a solid generated by rotating the region between semi-circle y = 1 Ã¢Ë†â€™ âˆš1Ã¢Ë†â€™ x2 and straight line y = 1, about x axis, is ```

1. Ã¢Ë†Â2 - 4/3 Ã¢

2. 4Ã¢Ë†Â2 - 1/3 Ã¢Ë†Â

3. Ã¢Ë†Â2 - 3/4 Ã¢Ë†

4. 3/4 Ã¢Ë†Â2 - Ã¢Ë†Â

1.-3

2.0

3.3

4.4

## More MCQS

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