1
GATE EE 2018
Numerical
+2
-0
The equivalent circuit of a single phase induction motor is shown in the figure, where the parameters are

R1 = R2' = Xl1 = Xl2' = 12 $$\Omega$$, Xm = 240 $$\Omega$$

and s is the slip. At no-load, the motor speed can be approximated to be the synchronous speed. The no-load lagging power factor of the motor is___________ (up to 3 decimal places).
2
GATE EE 2018
+1
-0.33
A positive charge of 1 nC is placed at (0, 0, 0.2) where all dimensions are in metres. Consider the x - y plane to be a conducting ground plane.

Take $${\varepsilon _0} = 8.85 \times {10^{ - 12}}$$ F/m.

The Z component of the E field at (0, 0, 0.1) is closest to
A
899.18 V/m
B
- 899.18 V/m
C
999.09 V/m
D
- 999.09 V/m
3
GATE EE 2018
Numerical
+2
-0.67
The capacitance of an air-filled parallel-plate capacitor is 60 pF. When a dielectric slab whose thickness is half the distance between the plates, is placed on one of the plates covering it entirely, the capacitance becomes 86 pF. Neglecting the fringing effects, the relative permittivity of the dielectric is _____________ (up to 2 decimal places).
4
GATE EE 2018
+1
-0.3
Four power semiconductor devices are shown in the figure along with their relevant terminals. The device(s) that can carry dc current continuously in the direction shown when gated appropriately is (are)
A
Triac only
B
Triac and MOSFET
C
Triac and GTO
D
Thyristor and Triac
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