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I am from Electrical and Electronics department, attended for

Hai I am from Electrical and Electronics department, attended for HAL-Management Trainee On-Line written test on 14th-Nov-2008

Time:      12:30-15:00

Venue:      Narayanamma Institute of Technology,      Hyderabad

Some of the questions from my paper are given below:

• When length of a wire increases  its resistance
• a. doubles            b. half               c. remains same

Ans:            ( a )

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

a. 12.5Hz      b. 1.25Hz      c. 4Hz

Ans:      ( b )

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

a. motoring       b. braking       c. generating

Ans:      ( a )

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

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

• Damping ratio ( ξ ) is 0.75, natural frequency is 12 rad/s are given & asked to find peak time
• In electrodynamo-meter type wattmeter
• a.      pressure coil is made fixed

b.      current coil is made fixed

c.      both the coils are made fixed

Ans:            ( a )

• In flux meter control torque is produced by
• a.      weights attached to it.

b.      Springs

c.      No control torque is there

Ans:            ( c )

• One question regarding hot wire instrument
• In MI meters deflecting torque is proportional to
• a.      square of the current

b.      square of the voltage

Ans:            ( a )

• In 3-Φ system total power is given by
• a.      √3V­LILcos Φ

b.      3V­LILcos Φ

c.      V­LILcos Φ

Ans:            ( a )

• From supply one 3-Φ step-down transformer is drawing 10 A, the secondary current will be minimum when the transformer is
• a.      star-delta

b.      delta-star

c.      delta-delta

d.      star-star

Ans:            ( b )

• Transformer rating is expressed in
• a.      KVA

b.      KVAR

c.      KW

Ans:            ( a )

• Manganin is a
• a.      Insulator

b.      Semi-conductor

c.      Alloy

Ans:            ( I think it is alloy )

• Dual scope oscilloscope has
• a.      two separate horizontal and two separate vertical plates

b.      one horizontal and two separate vertical plates

c.      two separate horizontal and one vertical plates

d.      one horizontal and one vertical plates

• Standard Cell voltage is measured by
• a.      MI meter

b.      MC meter

c.      Potentiometer

• The input resistance of the CRO is of the order of
• a.      tens of ohm

b.      mega ohm

c.      kilo ohm

d.      fraction of an ohm

Ans:            ( b )

• Errors are introduced in Wheatstone bridge due to

b.      contact resistance

c.      some thing is given

d.      all of the above

Ans:            ( I think d )

• HRC fuse and circuit-breaker combination is used CB operates for

c.      combination is never used

Ans:            ( I think a )

• G(s) = K / s(s+5)(s+1)  is given to find the value of K for stable operation
• By increasing gain of the system root locus will
• a.      moves away from poles

b.      moves away from zeros

c.      crosses imaginary axis

Ans:            ( a )

• When the load current is high while measuring power using wattmeter
• a.      current coil is connected near load

b.      pressure coil is connected near load

• C = 0.01µF and L = 1 mH and current is 10 A and asked to find the voltage drop
• Transmission line is terminated by R and no reflection is there , then the value of  R is _________
• Ans:            400 ohm

• One question regarding shunt ohm-meter and seriea ohm-meter
• Inverted V curves are drawn between ________
• Ans:            field current             Vs            power factor

• Copper loss and Iron loss are given and asked to find at what fraction of full load max.efficiency occurs              ( easy to solve )
• Aroud 3-4 questions from errors by giving resistance values with their standard deviation like 15 ± 5 % asked to find out the series combination error and parallel combination error likewise
• Odd man out in aptitude about two questions
• In reasoning finding the next diagram in series
• One Antonym
• Mainly you should perfect in tenses for solving English questions
•

These are the questions I have remembered from my paper, I think major share in my question paper is from measurements and next  AC machines

ALL THE VERY BEST

Raj psn

Time:      12:30-15:00

Venue:      Narayanamma Institute of Technology,      Hyderabad

Some of the questions from my paper are given below:

• When length of a wire increases  its resistance
• a. doubles            b. half               c. remains same

Ans:            ( a )

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

a. 12.5Hz      b. 1.25Hz      c. 4Hz

Ans:      ( b )

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

a. motoring       b. braking       c. generating

Ans:      ( a )

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

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

• Damping ratio ( ξ ) is 0.75, natural frequency is 12 rad/s are given & asked to find peak time
• In electrodynamo-meter type wattmeter
• a.      pressure coil is made fixed

b.      current coil is made fixed

c.      both the coils are made fixed

Ans:            ( a )

• In flux meter control torque is produced by
• a.      weights attached to it.

b.      Springs

c.      No control torque is there

Ans:            ( c )

• One question regarding hot wire instrument
• In MI meters deflecting torque is proportional to
• a.      square of the current

b.      square of the voltage

Ans:            ( a )

• In 3-Φ system total power is given by
• a.      √3V­LILcos Φ

b.      3V­LILcos Φ

c.      V­LILcos Φ

Ans:            ( a )

• From supply one 3-Φ step-down transformer is drawing 10 A, the secondary current will be minimum when the transformer is
• a.      star-delta

b.      delta-star

c.      delta-delta

d.      star-star

Ans:            ( b )

• Transformer rating is expressed in
• a.      KVA

b.      KVAR

c.      KW

Ans:            ( a )

• Manganin is a
• a.      Insulator

b.      Semi-conductor

c.      Alloy

Ans:            ( I think it is alloy )

• Dual scope oscilloscope has
• a.      two separate horizontal and two separate vertical plates

b.      one horizontal and two separate vertical plates

c.      two separate horizontal and one vertical plates

d.      one horizontal and one vertical plates

• Standard Cell voltage is measured by
• a.      MI meter

b.      MC meter

c.      Potentiometer

• The input resistance of the CRO is of the order of
• a.      tens of ohm

b.      mega ohm

c.      kilo ohm

d.      fraction of an ohm

Ans:            ( b )

• Errors are introduced in Wheatstone bridge due to

b.      contact resistance

c.      some thing is given

d.      all of the above

Ans:            ( I think d )

• HRC fuse and circuit-breaker combination is used CB operates for

c.      combination is never used

Ans:            ( I think a )

• G(s) = K / s(s+5)(s+1)  is given to find the value of K for stable operation
• By increasing gain of the system root locus will
• a.      moves away from poles

b.      moves away from zeros

c.      crosses imaginary axis

Ans:            ( a )

• When the load current is high while measuring power using wattmeter
• a.      current coil is connected near load

b.      pressure coil is connected near load

• C = 0.01µF and L = 1 mH and current is 10 A and asked to find the voltage drop
• Transmission line is terminated by R and no reflection is there , then the value of  R is _________
• Ans:            400 ohm

• One question regarding shunt ohm-meter and seriea ohm-meter
• Inverted V curves are drawn between ________
• Ans:            field current             Vs            power factor

• Copper loss and Iron loss are given and asked to find at what fraction of full load max.efficiency occurs              ( easy to solve )
• Aroud 3-4 questions from errors by giving resistance values with their standard deviation like 15 ± 5 % asked to find out the series combination error and parallel combination error likewise
• Odd man out in aptitude about two questions
• In reasoning finding the next diagram in series
• One Antonym
• Mainly you should perfect in tenses for solving English questions
•

These are the questions I have remembered from my paper, I think major share in my question paper is from measurements and next  AC machines

ALL THE VERY BEST

Raj psn