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1.
Statement for Linked Answer Questions:
Assume that the threshold voltage of the N-channel MOSFET shown in Fig. is +0.75V. The output characteristics of the MOSFET are also shown.
[1] The transconductance of the MOSFET is: [2 marks]
(a) 0.75 mS
(b) 1 mS
(c) 2 mS
(d) 10 mS[2] The voltage gain of the amplifier is: [2 marks]
(a) +5
(b) -7.5
(c) +10
(d) -10asked in Electrical Engineering, 2005
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2.
Statement for Linked Answer Questions :
At a 220 kV substation of a power system, it is given that the three-phase fault level is 4000 MVA and single-line to ground fault level is 5000 MVA. Neglecting the resistance and the shunt susceptances of the system.[1] The positive sequence driving point reactance at the bus is: [2 marks]
(a) 2.5Ω
(b) 4.033Ω
(c) 5.5Ω
(d) 12.1Ω[2] And the zero sequence driving point reactance at the bus is: [2 marks]
(a) 2.2Ω
(b) 4.84Ω
(c) 18.18Ω
(d) 22.72Ωasked in Electrical Engineering, 2005
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3.
Statement for Linked Answer Questions :
A 1000 kVA, 6.6 kV, 3-phase star connected cylindrical pole synchronous generator has a synchronous reactance of 20 Ω. Neglect the armature resistance and consider operation at full load and unity power factor.[1] The induced emf (line-to-line) is close to [2 marks]
(a) 5.5 kV
(b) 7.2 kV
(c) 9.6 kV
(d) 12.5 kV[2] The power (or torque) angle is close to [2 marks]
(a) 13.9°
(b) 18.3°
(c) 24.6°
(d) 33.0°asked in Electrical Engineering, 2005
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4.
Statement for Linked Answer Questions ::
A state variable system , with the initial condition x[0] = [-1 3]T and the unit step input u(t) has[1] The state transition matrix [2 marks]
[2] and the state transition equation [2 marks]
asked in Electrical Engineering, 2005
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5.
Statement for Linked Answer Questions ::
A coil of inductance 10 H resistance 40Ω is connected as shown in Fig. After the switch S has been in connection with point 1 for a very long time, it is moved to point 2 at t = 0.
[1] If, at t = 0+, the voltage across the coil is 120V, the value of resistance R is:
[2 marks]
(a) 0Ω
(b) 20Ω
(c) 40Ω
(d) 60Ω[2] For the value of R obtained in (above question), the time taken for 95% of the stored energy dissipated is close to [2 marks]
(a) 0.10 sec
(b) 0.15 sec
(c) 0.50 sec
(d) 1.0 secasked in Electrical Engineering, 2005
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6.