1
GATE EE 2013
+2
-0.6
A strain gauge forms one arm of the bridge shown in the figure below and has a nominal resistance without any load as $$\,{R_s} = 300\Omega .$$ Other bridge resistance are $$\,{R_1} = {R_2} = {R_3} = 300\Omega .\,\,$$ The maximum permissible current through the strain gauge is $$20$$ $$mA.$$ During certain measurement when the bridge is excited by maximum permissible voltage and the strain gauge resistance is increased by $$1$$% over the nominal value, the output voltage $${V_0}$$ in $$mV$$ is
A
$$56.02$$
B
$$40.83$$
C
$$29.85$$
D
$$10.02$$
2
GATE EE 2013
+1
-0.3
A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV windings, he measured loss is 81 W. The transformer has maximum efficiency when operated at
A
50.0% of the rated current.
B
64.0% of the rated current.
C
80.0% of the rated current.
D
88.8% of the rated current.
3
GATE EE 2013
+2
-0.6
The following arrangement consists of an ideal transformer and an attenuator which attenuates by a factor of 0.8. An ac voltage VWX1 = 100V is applied across WX to get an open circuit voltage VYZ1 across YZ. Next, an ac voltage VYZ2 =100V is applied across YZ to get an open circuit voltage VWX2 across WX. Then, $$\frac{V_{YZ1}}{V_{WX1}}$$, $$\frac{V_{WX2}}{V_{YZ2}}$$ are respectively,
A
125/100 and 80/100
B
100/100 and 80/100
C
100/100 and 100/100
D
80/100 and 80/100
4
GATE EE 2013
+1
-0.3
Leakage flux in an induction motor is
A
flux that leaks through the machine
B
flux that links both stator and rotor windings
C
flux that links none of the windings
D
flux that links the stator winding or the rotor winding but not both
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