BSNL TTA Electrical MCQ
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Attempt Free BSNL TTA Electrical MCQ Here. Read The Important BSNL MCQ From Below.
NOTE-NO OF QUESTIONS 116
ANSWER KEY-Correct answer is indicated by symbol (V) in options.
HINTS-In some questions options E-HINTS is indicating the hints of answer
SAMPLE QUESTIONS AND ANSWER
ANSWER KEY-Correct answer is indicated by symbol (V) in options.
HINTS-In some questions options E-HINTS is indicating the hints of answer
SAMPLE QUESTIONS AND ANSWER
1) Eddy current loss will depends on
A [ ]) Frequency
B [ ]) Flux density
C [ ]) Thickness
D [v]) All of the above
E [ ]) HINTS-Eddy current loss=kf²Bm²
A [ ]) Frequency
B [ ]) Flux density
C [ ]) Thickness
D [v]) All of the above
E [ ]) HINTS-Eddy current loss=kf²Bm²
2) Hysteresis loss will depends on
A [v]) f
B [ ]) f²
C [ ]) f³
D [ ]) f½
A [v]) f
B [ ]) f²
C [ ]) f³
D [ ]) f½
3) Thin laminations are used in a machine in order to reduce
A [v]) Eddy current losses
B [ ]) Hysteresis losses
C [ ]) Both 1 and 2
D [ ]) Copper losses
E [ ]) HINTS-Thin laminations are used in order to reduce the eddy current losses only. Due to laminations the area of the eddy currents loops are minimized and the losses due to eddy current losses are minimized.
A [v]) Eddy current losses
B [ ]) Hysteresis losses
C [ ]) Both 1 and 2
D [ ]) Copper losses
E [ ]) HINTS-Thin laminations are used in order to reduce the eddy current losses only. Due to laminations the area of the eddy currents loops are minimized and the losses due to eddy current losses are minimized.
BSNL TTA Electrical MCQ
4) Hysteresis loop represents the area of
A [ ]) eddy current loss
B [ ]) copper loss
C [ ]) total iron losses
D [v]) hysteresis loss
E [ ]) HINTS-Hysteresis loop will represents only hysteresis losses. It is found out by area of B-H loop curve of a magnetic material
A [ ]) eddy current loss
B [ ]) copper loss
C [ ]) total iron losses
D [v]) hysteresis loss
E [ ]) HINTS-Hysteresis loop will represents only hysteresis losses. It is found out by area of B-H loop curve of a magnetic material
5) Total core loss is also called as ————-?
A [ ]) Eddy current loss
B [ ]) Hysteresis loss
C [v]) Magnetic loss
D [ ]) Copper loss
E [ ]) HINTS-The total core loss or magnetic loss consists of eddy current loss and hysteresis loss.
A [ ]) Eddy current loss
B [ ]) Hysteresis loss
C [v]) Magnetic loss
D [ ]) Copper loss
E [ ]) HINTS-The total core loss or magnetic loss consists of eddy current loss and hysteresis loss.
6) Which of the following are variable losses?
A [ ]) eddy current loss
B [ ]) hysteresis loss
C [ ]) shunt field copper loss
D [v]) armature copper loss
E [ ]) HINTS-Armature copper loss is directly proportional to square of armature current. Therefore as the load varies these will also vary.
A [ ]) eddy current loss
B [ ]) hysteresis loss
C [ ]) shunt field copper loss
D [v]) armature copper loss
E [ ]) HINTS-Armature copper loss is directly proportional to square of armature current. Therefore as the load varies these will also vary.
BSNL TTA Electrical MCQ
7) Maximum efficiency will occur, when copper loss is _______to iron loss?
A [ ]) greater than
B [ ]) less than
C [v]) equals to
D [ ]) any of the above
E [ ]) HINTS-Condition for maximum efficiency is, copper loss = iron loss or variable losses is equals to fixed losses.
A [ ]) greater than
B [ ]) less than
C [v]) equals to
D [ ]) any of the above
E [ ]) HINTS-Condition for maximum efficiency is, copper loss = iron loss or variable losses is equals to fixed losses.
8) Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to
A [ ]) very low
B [ ]) less than one.
C [ ]) greater than one.
D [v]) approx to one.
A [ ]) very low
B [ ]) less than one.
C [ ]) greater than one.
D [v]) approx to one.
BSNL TTA Electrical MCQ
9) The basic function of a transformer is to change
A [ ]) the power level
B [ ]) the power factor
C [v]) the level of the voltage
D [ ]) the frequency
E [ ]) HINTS-A transformer can be used for either step up or step down the voltages. Its basic application in power system is to transform the voltage from one level to another level without changing its frequency and power.
A [ ]) the power level
B [ ]) the power factor
C [v]) the level of the voltage
D [ ]) the frequency
E [ ]) HINTS-A transformer can be used for either step up or step down the voltages. Its basic application in power system is to transform the voltage from one level to another level without changing its frequency and power.
10) Transformer action requires a
A [ ]) constant magnetic flux
B [ ]) increasing magnetic flux
C [v]) alternating magnetic lux
D [ ]) alternating electric flux
E [ ]) HINTS-The energy transfer from one winding to another is entirely through magnetic medium it is known as transformer action based on the principle of electromagnetic induction proposed by faraday. Therefore, transformer action requires an alternating or time varying magnetic flux to transfer power from primary side to secondary side. Since induced emf in the winding is due to flux linkage.
A [ ]) constant magnetic flux
B [ ]) increasing magnetic flux
C [v]) alternating magnetic lux
D [ ]) alternating electric flux
E [ ]) HINTS-The energy transfer from one winding to another is entirely through magnetic medium it is known as transformer action based on the principle of electromagnetic induction proposed by faraday. Therefore, transformer action requires an alternating or time varying magnetic flux to transfer power from primary side to secondary side. Since induced emf in the winding is due to flux linkage.
BSNL TTA Electrical MCQ
