Hindustan Aeronautics Ltd (HAL) Placement Papers 

Aeronautical Engineering

Air Fuel ratio in a jet engine will be of the order of:
(a) 10:1 (b) 15:1
(c) 20:1 (d) 60:1

Fighter bombers use following type of engine:
(a) Turbo-jet (b) Turbo-propeller
(c) Rocket (d) Ram-jet

Mechanical Engineering

Least shrinkage allowance is provided in the case of following:
(a) Brass (b) Aluminium
(c) Cast Iron (d) Steel

If V is the volume of metal in a casting and A its surface area, the time of solidification will be proportional to:
(a) V, 1/A (b) V,1/A2
(c ) V2 ,1/A (d) V2, 1/A2

Fire tube boilers are limited to a maximum design working pressure of :
(a) 1 kg/cm2 (b) 6 kg/cm2
(C) 17 kg/cm2 (d ) 100 kg/cm2

Metallurgy

1. A dislocation represented by T is called:

(a) Positive edge dislocation
(b) Negative edge dislocation
(c) Positive screw dislocation
(d) Negative screw dislocation

2. The recrystallisation temperature of a cold worked material decreases with:

(a) Increase in the degree of deformation
(b) Increase in the initial grain size
(c) Increase in the temperature of cold working
(d) The presence of impurity

Electrical Engineering

1. In a thyrister full converter feeding a continuous load current, what is the duration each thyrister conducts in a cycle?

(a) 60 0 (b) 90 0
(c) 120 0 (d) 180 0

2. In a three-phase induction motor, the rotor field runs at the following speed with Respect to the stator structure:

(a) At synchronous speed in the direction of stator field
(b) At a slip speed in the direction of stator speed
(c) At synchronous speed in a direction opposite to that of stator field
(d) At zero speed

Electronics

1. In the hybrid parameter model of a transistor reverse transfer voltage ratio and forward transfer current ratio are respectively given by:

(a) h11 and h21 (b) h12 and h11
(c) h21 and h11 (d) None of these

2. A Signal x(t) has the Fourier transform

X(?) = { 1 for | ? | < }W . Its first zero-crossing in time domain occurs at:

O otherwise

(a) 1/pW (b) W
( c) p/ W (d) None of these

Computer Science

1. Magnetic tapes are suitable to applications:

(a) When only a few records are to be accessed
(b) When most of the records are to be accessed
(c) Only when all the records are to be processed
(d) None of the above

2. A system in which 2 or more cpu’s are interconnnected and share a common

Main memory is called:

(a) Pipeline machine
(b) Multifunctional system
(c) Multiprocess
(d) None of these

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