Transformer Losses MCQs : This section focuses on the "Transformer Losses" in Transformers. These Multiple Choice Questions (MCQs) should be practiced to improve the Transformers skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Which of the following is not types of Losses in a Transformer?
A. hysteresis loss
B. eddy current loss
C. resistance loss
D. dielectric loss
Explanation: resistance loss is not types of Losses in a Transformer.
Which of the following is also known as Core loss
A. Iron Losses
B. Hysteresis Loss
C. Eddy Current Loss
D. Ohmic Loss
Explanation: Iron losses are caused by the alternating flux in the core of the transformer as this loss occurs in the core it is also known as Core loss.
Iron loss is further divided into ?
Explanation: Iron loss is further divided into hysteresis and eddy current loss.
The eddy current loss is minimized by making the core with thin laminations
C. Can be true or false
D. Can not say
Explanation: True, The eddy current loss is minimized by making the core with thin laminations.
Copper losses vary as the square of the load_______
D. All of the above
Explanation: Copper losses vary as the square of the load current
Which loss occur due to the presence of leakage field?
A. Hysteresis losses
B. Dielectric Loss
C. Radiative Loss
D. Stray Loss
Explanation: The occurrence of these stray losses is due to the presence of leakage field.
Leakage flux in the transformer depends on _____________________
A. Load current and voltage
B. Load current, voltage and frequency
C. Load current, voltage, frequency and power factor
D. Load current
Explanation: Leakage flux is directly proportional to the current, as if is current increased net value of flux increases thus, flux leakage also increases which further contribute to the losses as it is then not able to link with secondary windings
The full-load copper loss of a transformer is 1600 W. At half-load, the copper loss will be _______
A. 200 W
B. 400 W
C. 800 W
D. 1600 W
Explanation: Copper losses are defined as I2*R losses many times, as they are directly proportional to the square of current flowing through them. Thus, copper losses will reduce if load is reduced that too in square proportion.
Silicon steel used in laminations, because it reduces ________________
A. Hysteresis loss
B. Eddy current losses
C. Copper losses
D. Can not say
Explanation: Electrical steels are also known as lamination steel or silicon steel. The main special thing related to the silicon steel is, its magnetic properties such as small hysteresis area and hence, small energy dissipation per cycle, thus low core loss.
Which of the following loss in a transformer is zero even at full load?
A. Core loss
B. Eddy current loss
C. Friction loss
D. Hysteresis loss
Explanation: Friction losses are involved with rotating parts of a machine. Since in a transformer all parts are stationary, friction losses will always be equal to zero, irrespective of the loading condition.