# Multiple choice question for engineering

## Set 1

1. What is the formula for the resistance of running winding?

a) resistance of running winding = 0.021 * no of turns in running winding * length of mean turns of running winding * area of running winding conductor

b) resistance of running winding = 0.021 / no of turns in running winding * length of mean turns of running winding * area of running winding conductor

c) resistance of running winding = 0.021 * no of turns in running winding / length of mean turns of running winding * area of running winding conductor

d) resistance of running winding = 0.021 * no of turns in running winding * length of mean turns of running winding / area of running winding conductor

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2. How many parameters are present in the single phase induction motor?

a) 2

b) 3

c) 4

d) 5

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3. How many parameters are present under the leakage reactance calculations?

a) 6

b) 5

c) 7

d) 4

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4. How is the winding arrangement and how is the conductors in each slot?

a) circular winding and same conductors in each slot

b) circular winding and different conductor in each slot

c) concentric winding and same conductor in each slot

d) concentric winding and different conductor in each slot

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5. What is the relation of the total slot leakage reactance with number of stator slots?

a) slot leakage reactance is directly proportional to the number of stator slots

b) slot leakage reactance is indirectly proportional to the number of stator slots

c) slot leakage reactance is directly proportional to the square of the number of stator slots

d) slot leakage reactance is indirectly proportional to the square of the number of stator slots

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6. What is the relation between slot leakage reactance and specific slot permeance?

a) slot leakage reactance is directly proportional to the specific slot permeance

b) slot leakage reactance is indirectly proportional to the specific slot permeance

c) slot leakage reactance is directly proportional to the square of the specific slot permeance

d) slot leakage reactance is indirectly proportional to the square of the specific slot permeance

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7. What is the relation of the total slot leakage reactance with number of stator slots?

a) slot leakage reactance is directly proportional to the number of rotor slots

b) slot leakage reactance is indirectly proportional to the number of rotor slots

c) slot leakage reactance is directly proportional to the square of the number of rotor slots

d) slot leakage reactance is indirectly proportional to the square of the number of rotor slots

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8. What is the relation of the zigzag reactance with the specific permeance for zigzag leakage?

a) zigzag reactance is directly proportional to the specific permeance for zigzag leakage

b) zigzag reactance is indirectly proportional to the specific permeance for zigzag leakage

c) zigzag reactance is directly proportional to the square of the specific permeance for zigzag leakage

d) zigzag reactance is indirectly proportional to the square of the specific permeance for zigzag leakage

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9. What is the relation of the stator slot leakage factor with the skew leakage reactance?

a) skew leakage reactance is directly proportional to the stator slot leakage factor

b) skew leakage reactance is indirectly proportional to the stator slot leakage factor

c) skew leakage reactance is directly proportional to the square of stator slot leakage factor

d) skew leakage reactance is indirectly proportional to the square of stator slot leakage factor

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10. What is the formula for the rotor bar skew angle?

a) rotor bar skew angle = 3.14 / rotor slot pitches through which bars are skewed * (no of rotor slots / number of poles)

b) rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed * (no of rotor slots * number of poles)

c) rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed / (no of rotor slots * number of poles)

d) rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed / (no of rotor slots / number of poles)

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11. What is the value of the stator slot leakage factor?

a) 0.90

b) 0.80

c) 0.95

d) 0.85

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12. What is the relation of the overhang leakage reactance with the average coil span in slots?

a) overhang leakage reactance is directly proportional to the square of the average coil span in slots

b) overhang leakage reactance is indirectly proportional to the square of the average coil span in slots

c) overhang leakage reactance is directly proportional to the average coil span in slots

d) overhang leakage reactance is indirectly proportional to the average coil span in slots

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13. What is the relation between pole pitch and the magnetizing reactance?

a) magnetizing reactance is directly proportional to the square of the pole pitch

b) magnetizing reactance is directly proportional to the pole pitch

c) magnetizing reactance is indirectly proportional to the pole pitch

d) magnetizing reactance is indirectly proportional to the square of the pole pitch

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14. The magnetizing reactance is directly proportional to the saturation factor?

a) true

b) false

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15. What is the formula of the saturation factor?

a) saturation factor = total mmf required for magnetic circuit * mmf required for air gap

b) saturation factor = total mmf required for magnetic circuit – mmf required for air gap

c) saturation factor = total mmf required for magnetic circuit / mmf required for air gap

d) saturation factor = total mmf required for magnetic circuit + mmf required for air gap

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16. What factor is the core length made equal to in theoretical conditions?

a) pole length

b) pole proportion

c) pole length

d) number of poles

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17. What is the output equation of a single phase induction motor developed by P.H Tricky?

a) diameter^{2} * length = 16.5 / H.P * output coefficient * frequency constant * motor type constants * rpm * 10^{6}

b) diameter^{2} * length = 16.5 * H.P * output coefficient * frequency constant * motor type constants /rpm * 10^{6}

c) diameter^{2} * length = 16.5 * H.P / output coefficient * frequency constant * motor type constants * rpm * 10^{6}

d) diameter^{2} * length = 16.5 * H.P * output coefficient / frequency constant * motor type constants * rpm * 10^{6}

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^{2}* length value.

## Set 2

1. What are the factors the design of poles of the DC machine depends on?

a) length, breadth, height of the conductors

b) area of cross section of poles

c) area of cross section of poles and height of the poles

d) area of cross section of poles and height of the poles and the design of field windings

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2. What is the relationship between flux in the pole body and the useful flux per pole?

a) flux in the pole body is directly proportional to useful flux per pole

b) flux in the pole body is indirectly proportional to the useful flux per pole

c) flux in the pole body is directly proportional to the square of useful flux per pole

d) flux in the pole body is indirectly proportional to the square of useful flux per pole

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3. What is the flux in the pole body, given leakage coefficient = 1.2 and the useful flux per pole is 10 weber?

a) 12 weber

b) 11.2 weber

c) 8.2 weber

d) 20 weber

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4. What is the meaning of useful flux?

a) the flux which is being created in the machine

b) the flux which can be used

c) the flux which can produce the output

d) the flux that is wasted

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5. What is the range of leakage coefficient for output of 100kW?

a) 1.12-1.25

b) 1.11-1.22

c) 1.10-1.20

d) 1.11-1.15

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6. What is the range of leakage coefficient for output of 1000kW?

a) 1.12-1.25

b) 1.11-1.22

c) 1.09-1.18

d) 1.08-1.16

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7. What is the range of the flux density in the pole shrank for laminated poles?

a) 1.1-1.7 Wb per m^{2}

b) 1.2-1.6 Wb per m^{2}

c) 1.3-1.7 Wb per m^{2}

d) 1.2-1.7 Wb per m^{2}

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8. What is the formula for the area of the poles shrank of the laminated poles?

a) area of the pole shrank = flux in the pole body * magnetic field

b) area of the pole shrank = flux in the pole body + magnetic field

c) area of the pole shrank = flux in the pole body – magnetic field

d) area of the pole shrank = flux in the pole body / magnetic field

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9. What should be the length of pole with respect to the length of the armature and what should be the range of the length of pole?

a) length of pole < length of armature, 10-15 m

b) length of pole > length of armature, 10-15 mm

c) length of pole > length of armature, 10-15 cm

d) length of pole < length of armature, 10-15 mm

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10. The formula for length of pole is L = Total length of armature – (0.001 to 0.005)?

a) true

b) false

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11. What is the formula for the width of pole of DC machines?

a) width of pole body = area of the pole * length of the pole

b) width of pole body = area of the pole + length of the pole

c) width of pole body = area of the pole – length of the pole

d) width of pole body = area of the pole / length of the pole

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12. The height of the pole depends on the mmf to be provided on the pole at full load ?

a) true

b) false

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13. How is the mmf required at full load obtained for the calculation of height of poles?

a) using closed circuit characteristics

b) using open circuit characteristics

c) using formula

d) using equivalent circuit

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14. How should the field mmf be with respect to armature mmf to reduce the armature reaction?

a) armature mmf > field mmf

b) armature mmf >= field mmf

c) armature mmf < field mmf

d) armature mmf = field mmf

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15. What should be the range of the field mmf to armature mmf ratio at full load?

a) 1.0-1.2

b) 1.1-1.3

c) 1.3-1.5

d) 1.1-1.25

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## Set 3

1. What happens in the rotating electrical machine?

a) armatures are slotted

b) armatures are slotted and results in the movement of rotor

c) the rotor remains stationary

d) the rotor slots are rotating

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2. What is pulsation losses?

a) flux pulsations are caused due to the slotted armature

b) flux pulsations are caused due to the rotation of machine

c) flux pulsation occurs due to rotor slots are rotating

d) flux pulsations occur due to the change in reluctance

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3. In which machine part/parts does the pulsation loss occurs?

a) teeth

b) pole face

c) conductors

d) teeth and pole faces

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4. How are the pulsation losses aggravated?

a) if the air gap is small compared with slot openings

b) if the air gap is reduced

c) if the air gap is increased

d) if the air gap is made larger than the slot openings

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5. The slotting produces harmonic fields which cause high frequency losses near the gap surface?

a) true

b) false

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6. In which machine is the pulsation losses considerable?

a) synchronous motors

b) induction motors

c) dc shunt motors

d) dc series motors

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7. What are the factors the permeance depends upon in the zigzag leakage?

a) relative position of stator

b) relative position of rotor

c) relative position of stator and rotor

d) stored energy at any position

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8. What is the formula for the stored energy at any position?

a) stored energy at any position = mmf per slot2 * permeance in a particular position

b) stored energy at any position =2 * mmf per slot2 * permeance in a particular position

c) stored energy at any position =1/2 * mmf per slot2 * permeance in a particular position

d) stored energy at any position =1/3 * mmf per slot2 * permeance in a particular position

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9. What is the formula for the zigzag permeance?

a) zigzag permeance = average width of the rotor tooth / (1/2 * mmf per slot2)

b) zigzag permeance = average width of the rotor tooth * (1/2 * mmf per slot2)

c) zigzag permeance = 1/average width of the rotor tooth *(1/2 * mmf per slot2)

d) zigzag permeance = average width of the rotor tooth *(1/2 / mmf per slot2)

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10. What is the formula of the zigzag specific permeance?

a) zigzag specific permeance = average width of the rotor tooth * length / (1/2 * mmf per slot2)

b) zigzag specific permeance = average width of the rotor tooth / length * (1/2 * mmf per slot2)

c) zigzag specific permeance = average width of the rotor tooth * length * (1/2 * mmf per slot2)

d) zigzag specific permeance =1/ average width of the rotor tooth * length * (1/2 * mmf per slot2)

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11. What are the factors the overhang leakage reactance is obtained?

a) length of the overhang

b) diameter of the overhang

c) shape of the overhang

d) length of the overhang along with the shape of the overhang

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12. The overhang leakage reactance depends on the degree of the saturation in the ferromagnetic parts?

a) true

b) false

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13. What is the relation between the overhang specific permeance and the slot pitch?

a) overhang specific permeance is directly proportional to the slot pitch

b) overhang specific permeance is indirectly proportional to the slot pitch

c) overhang specific permeance is directly proportional to the square of the slot pitch

d) overhang specific permeance is indirectly proportional to the square of the slot pitch

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## Set 4

1. When was the computer aided design introduced and who was the founder?

a) 1950, Heroz

b) 1959, Heroz

c) 1959, Veinott

d) 1956, Veinott

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2. How many commonly accepted papers are present in the machine design?

a) 3

b) 2

c) 4

d) 5

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3. What is the concept of analysis method?

a) the choice of dimension alone is made by designer and provided to computer

b) the choice of dimension and materials are made by designer and provided to computer

c) the choice of dimension, materials and types of construction are made by designer and provided to computer

d) the choice of types of construction are made by designer and provided to computer

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4. How many different approaches are present in the computer aided design ?

a) 2

b) 3

c) 4

d) 5

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5. It is fairly easy to program and to use and understand the analysis method?

a) True

b) False

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6. What happens in the synthesis method?

a) The computer takes its own values

b) Desired performance is given as input to the computer

c) Logical instructions are incorporated in the program

d) Desired performance is given as input along with the logical instruction being incorporated in the program

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7. What is the hybrid method of computer aided design?

a) advanced analysis method

b) advanced synthesis method

c) combination of advanced and synthesis method

d) different method

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8. How many transformers are considered in the power system?

a ) 2

b) 3

c) 4

d) 5

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9. How many design procedures are present in the design of transformers?

a) 10

b) 9

c) 11

d) 8

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10. What is the symbol used for the maximum flux density in computer aided designing?

a) Bm

b) Bf

c) Bfd

d) Bmf

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11.What is the symbol used for the number of turns in the secondary winding?

a) T

b) Tsw

c) Ts

d) Tws

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12. What is the symbol used for the mean diameter of the HV/LV winding?

a) Dm

b) Dmp

c) Dms

d) Dmp/Dms

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13. What is the symbol used for the resistance referred to HV winding?

a) RR

b) RRw

c) RRp

d) RRhw

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## Set 5

1. What is the concept of power rating of machines with respect to voltage?

a) the required supply voltage for smooth running of the machine

b) the required supply voltage for stopping the machine

c) the required supply voltage for speeding the machine

d) the required supply voltage for slowing up the machine

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2. What is the concept of power rating of machines with respect to current?

a) Maximum permissible amount of current that can easily flow

b) Minimum permissible amount of current that can easily flow

c) Maximum permissible amount of current that can stop the machine

d) Maximum permissible amount of current that can stop the machine

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3. What happens if there is insufficient rating of the machine?

a) The efficiency of the machine increases

b) The efficiency of the machine improves

c) Damage and shutdown occurs

d) Loading problems occur

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4. What happens if the power ratings of the machine are decided liberally?

a) Damage occurs to the machine

b) Efficiency of the machine improves

c) Long life of the machine

d) Uneconomical usage of the machine

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5. If the power ratings are crossed, machine breakdown occurs?

a) True

b) False

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6. What is one important criteria related to the power ratings of the machine?

a) Heat should be prevented from generation

b) Heat should be dissipated through power ventilation, irrespective of the time

c) Heat should be prevented through power ventilation within a short time period

d) Heat should be converted to some useful form

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7. What is the concept of thermal loading?

a) Output power is indirectly proportional to the temperature rise

b) Output power is indirectly proportional to the square of temperature rise

c) Output power is directly proportional to the temperature rise

d) Output power is directly proportional to the square of temperature rise

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8. What is the ideal condition for thermal dissipation?

a) Heat generated > Heat Dissipated

b) Heat generated < Heat Dissipated

c) Heat generated = Heat Dissipated

d) Heat generated = 0

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9. What is the main objective of power ratings of machines?

a) helps in building a suitable thermal model of machines

b) helps in building a suitable physical model of machines

c) helps in classifying the machines into different types

d) helps to improve the machine efficiency.

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10. Power ratings help in classifying machines to different classes of duties?

a) true

b) false