356278
The core of a transformer is laminated so that
1 Energy loss due to eddy currents may be reduced
2 Rusting of the core may be prevented
3 Change in flux may be increased
4 Ratio of voltage in the primary to that in the secondary may be increased
Explanation:
PHXII07:ALTERNATING CURRENT
356279
A step-down transformer reduces the voltage of a transmission line from 2200 \(V\) to 220 \(V\). The power delivered by it is 880 \(W\) and its efficiency is 88%. The input current is:
356280
To reduce the iron losses in a transformer, the core must be made of a material having
1 High retentivity, high coercivity
2 Low retentivity, low coercivity
3 High coercivity, low retentivity
4 High retentivity, low coercivity
Explanation:
Conceptual Question
PHXII07:ALTERNATING CURRENT
356281
A 220 \(V\) input is supplied to a transformer. The output circuit draws a current of 2.0 \(A\) at 440 \(V\). If the ratio of output to input power is 0.8, then the current drawn by primary winding is
1 \(3.6\,A\)
2 \(5.0\,A\)
3 \(2.5A\)
4 \(2.8A\)
Explanation:
Given, input voltage supplied to transformer, \({V_1} = 220V\) Current at output circuit of transformer, \({I_2} = 2A\) \({V_2} = 440V\) Given,\(\frac{{{\rm{Output}}\,{\rm{power}}\left( {{P_2}} \right)}}{{{\rm{Input}}\,{\rm{power}}\left( {{P_1}} \right)}} = 0.8 \Rightarrow \frac{{{V_2}{I_2}}}{{{V_1}{I_1}}} = 0.8\) \( \Rightarrow \frac{{440 \times 2}}{{220 \times {I_1}}} = 0.8\) \( \Rightarrow {I_1} = \frac{4}{{0.8}} = 5A\)
356278
The core of a transformer is laminated so that
1 Energy loss due to eddy currents may be reduced
2 Rusting of the core may be prevented
3 Change in flux may be increased
4 Ratio of voltage in the primary to that in the secondary may be increased
Explanation:
PHXII07:ALTERNATING CURRENT
356279
A step-down transformer reduces the voltage of a transmission line from 2200 \(V\) to 220 \(V\). The power delivered by it is 880 \(W\) and its efficiency is 88%. The input current is:
356280
To reduce the iron losses in a transformer, the core must be made of a material having
1 High retentivity, high coercivity
2 Low retentivity, low coercivity
3 High coercivity, low retentivity
4 High retentivity, low coercivity
Explanation:
Conceptual Question
PHXII07:ALTERNATING CURRENT
356281
A 220 \(V\) input is supplied to a transformer. The output circuit draws a current of 2.0 \(A\) at 440 \(V\). If the ratio of output to input power is 0.8, then the current drawn by primary winding is
1 \(3.6\,A\)
2 \(5.0\,A\)
3 \(2.5A\)
4 \(2.8A\)
Explanation:
Given, input voltage supplied to transformer, \({V_1} = 220V\) Current at output circuit of transformer, \({I_2} = 2A\) \({V_2} = 440V\) Given,\(\frac{{{\rm{Output}}\,{\rm{power}}\left( {{P_2}} \right)}}{{{\rm{Input}}\,{\rm{power}}\left( {{P_1}} \right)}} = 0.8 \Rightarrow \frac{{{V_2}{I_2}}}{{{V_1}{I_1}}} = 0.8\) \( \Rightarrow \frac{{440 \times 2}}{{220 \times {I_1}}} = 0.8\) \( \Rightarrow {I_1} = \frac{4}{{0.8}} = 5A\)
356278
The core of a transformer is laminated so that
1 Energy loss due to eddy currents may be reduced
2 Rusting of the core may be prevented
3 Change in flux may be increased
4 Ratio of voltage in the primary to that in the secondary may be increased
Explanation:
PHXII07:ALTERNATING CURRENT
356279
A step-down transformer reduces the voltage of a transmission line from 2200 \(V\) to 220 \(V\). The power delivered by it is 880 \(W\) and its efficiency is 88%. The input current is:
356280
To reduce the iron losses in a transformer, the core must be made of a material having
1 High retentivity, high coercivity
2 Low retentivity, low coercivity
3 High coercivity, low retentivity
4 High retentivity, low coercivity
Explanation:
Conceptual Question
PHXII07:ALTERNATING CURRENT
356281
A 220 \(V\) input is supplied to a transformer. The output circuit draws a current of 2.0 \(A\) at 440 \(V\). If the ratio of output to input power is 0.8, then the current drawn by primary winding is
1 \(3.6\,A\)
2 \(5.0\,A\)
3 \(2.5A\)
4 \(2.8A\)
Explanation:
Given, input voltage supplied to transformer, \({V_1} = 220V\) Current at output circuit of transformer, \({I_2} = 2A\) \({V_2} = 440V\) Given,\(\frac{{{\rm{Output}}\,{\rm{power}}\left( {{P_2}} \right)}}{{{\rm{Input}}\,{\rm{power}}\left( {{P_1}} \right)}} = 0.8 \Rightarrow \frac{{{V_2}{I_2}}}{{{V_1}{I_1}}} = 0.8\) \( \Rightarrow \frac{{440 \times 2}}{{220 \times {I_1}}} = 0.8\) \( \Rightarrow {I_1} = \frac{4}{{0.8}} = 5A\)
356278
The core of a transformer is laminated so that
1 Energy loss due to eddy currents may be reduced
2 Rusting of the core may be prevented
3 Change in flux may be increased
4 Ratio of voltage in the primary to that in the secondary may be increased
Explanation:
PHXII07:ALTERNATING CURRENT
356279
A step-down transformer reduces the voltage of a transmission line from 2200 \(V\) to 220 \(V\). The power delivered by it is 880 \(W\) and its efficiency is 88%. The input current is:
356280
To reduce the iron losses in a transformer, the core must be made of a material having
1 High retentivity, high coercivity
2 Low retentivity, low coercivity
3 High coercivity, low retentivity
4 High retentivity, low coercivity
Explanation:
Conceptual Question
PHXII07:ALTERNATING CURRENT
356281
A 220 \(V\) input is supplied to a transformer. The output circuit draws a current of 2.0 \(A\) at 440 \(V\). If the ratio of output to input power is 0.8, then the current drawn by primary winding is
1 \(3.6\,A\)
2 \(5.0\,A\)
3 \(2.5A\)
4 \(2.8A\)
Explanation:
Given, input voltage supplied to transformer, \({V_1} = 220V\) Current at output circuit of transformer, \({I_2} = 2A\) \({V_2} = 440V\) Given,\(\frac{{{\rm{Output}}\,{\rm{power}}\left( {{P_2}} \right)}}{{{\rm{Input}}\,{\rm{power}}\left( {{P_1}} \right)}} = 0.8 \Rightarrow \frac{{{V_2}{I_2}}}{{{V_1}{I_1}}} = 0.8\) \( \Rightarrow \frac{{440 \times 2}}{{220 \times {I_1}}} = 0.8\) \( \Rightarrow {I_1} = \frac{4}{{0.8}} = 5A\)
