Hindustan Aeronautical Limited Management Trainee HAL Mechanical Engineering exam papers

Hindustan Aeronautical Limited

Management Trainee

HAL Mechanical Engineering

Q.1.When length of a wire increases its resistance

• doubles
• half
• remains same
• none of these

Q.2.When a 50 Hz ,6-pole Induction Motor runs at 975rpm,the rotor emf frequency is

• 12.5Hz
• 1.25Hz
• 4Hz
• none of these

Q.3.When a 6 pole 50Hz Induction Motor runs at 1450 rpm , it’s working mode is

• motoring
• braking
• generating
• none of these

Q.4.Slips for Different modes of operation of Induction Motor are

• answer: motoring -0<S<1,generating- S<0,braking - S>1

Q.5.Damping ratio ( ? ) is 0.75, natural frequency is 12 rad/s are given & asked to find peak time

Q.6. In electrodynamo-meter type wattmeter

• pressure coil is made fixed
• current coil is made fixed
• both the coils are made fixed
• none of these

Q.7.In flux meter control torque is produced by

• weights attached to it.
• Springs
• No control torque is there
• none of these

Q.8.One question regarding hot wire instrument

Q.9.In MI meters deflecting torque is proportional to

• square of the current
• square of the voltage
• both above
• none of these

Q.10.In 3-F system total power is given by

• v3VLILcos F
• 3VLILcos F
• VLILcos F 
• none of these

Q.11.From supply one 3-F step-down transformer is drawing 10 A, the secondary current will be minimum when the transformer is

• star-delta
• delta-star
• delta-delta
• star-star

Q.12.Transformer rating is expressed in

• KVA
• KVAR
• KW
• none of these

Q.13.Manganin is a

• Insulator
• Semi-conductor
• Alloy
• none of these

Q.14.Dual scope oscilloscope has

• two separate horizontal and two separate vertical plates
• one horizontal and two separate vertical plates
• two separate horizontal and one vertical plates
• one horizontal and one vertical plates

Q.15.Standard Cell voltage is measured by

• MI meter
• MC meter
• Potentiometer
• none of these

Q.16.The input resistance of the CRO is of the order of

• tens of ohm
• mega ohm
• kilo ohm
• fraction of an ohm

Q.17.Errors are introduced in Wheatstone bridge due to

• lead resistance
• contact resistance
• some thing is given
• all of the above

Q.18.HRC fuse and circuit-breaker combination is used CB operates for

• low over-load currents
• high over-load currents
• combination is never used
• none of these

Q.19.Inverted V curves are drawn between ________

• Ans: field current Vs power factor

Q.20.By increasing gain of the system root locus will

• moves away from poles
• moves away from zeros
• crosses imaginary axis
• none of these

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