BSNL JTO paper set EEE

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Q1:- Universal motor is a motor 

1. series
2. 1-phase I.M.
3. synchronous
4. shunt

ANSWER:-1

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Q2:- Which of the following motors can work satisfactorily on both AC and DC

1. series
2. shunt motor
3. induction motor
4. synchronous motor

ANSWER:-1

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Q3:- Slip of a 3-phase induction motor may be expressed as 

1. rotor cu loss/rotor core loss
2. rotor cu loss/ rotor power i/p
3. rotor cu loss/ rotor i/p power
4. rotor power i/p /rotor cu loss

ANSWER:-2

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Q4:- Two alternator rated 40 MVA and 60 MVA respestively are working in parallel and supplying a total load of 80 MW speed regulation of both the alternators is 5% the load sharing.

1. 32 MW, 48 MW
2. 36 MW, 44 MW
3. 40 MW each
4. 30 MW, 50MW

ANSWER:-1

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Q5:- Ploe of d.c. m/c are often laminated to reduce 

1. eddy current loss
2. iron weight
3. armature reaction
4. hystessis loss

ANSWER:-1

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Q6:- The magnetic materials that are used to prepare permanent magnets should have.

  1.Steeply rising magnetization curve

     2.Small hysteresis loop

     3.High retentivity

     4.Low coercive force

ANSWER:-3

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Q7:- Eddy current loss in ferro magnetic core is proportional to 

           1.       Square of frequency

           2.       Square root of frequency

           3.       Frequency

           4.       Inversely proportional to frequency

ANSWER:-1

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Q8:- Hystersis losses are present in iron core cil when

            1.       The current in the coil is alternating

            2.       The current is unsymmetrical alternating only

            3.       The current in the coil is dc only

            4.       The current in the soil is sinusoidial

ANSWER:-1

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Q9:-AC series motors are built with as turns as possible to reduce

            1.       Flux

            2.       Reactance

            3.       Iron losses

            4.       Speed

ANSWER:-2

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Q10:- The direction of rotation of dc shunt motors can be reversed by interchanging

          1.       The armature terminals only

          2.       Either fields or armature terminals

          3.       The field terminals only

          4.       None 

ANSWER:-2

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