Test: Electrical Machines & Power Systems- 2 - Electrical Engineering (EE) MCQ
20 Questions MCQ Test - Test: Electrical Machines & Power Systems- 2
The ratio of starting torque to maximum torque is 80%. Then the slip at maximumtorque occurs is____________
A 4 pole, 50 Hz, 3<|> induction motor has blocked rotor reactance per phase is four times to the rotor resistance per phase. Thespeed at which maximum torque developed is
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Two 50 Hz induction motorshaving 10 & 14 poles are connected in cancated fashion. The possible synchronous speed is ____________
A 1φ, 50 Hz induction motor having '6' poles running at 940 rpm. Its slips with respect to backward field and forward fieldrespectively, are_____________
A 3φ, 3300 V, Y connected synchronous motor has an effective resistance and synchronous reactance of 2 Ω and 18.0 Ω per phase respectively. IftheO.C. generated emf is 2195 V per phase, the maximumpower developed by motor is______________
A line has conductance, inductance, resistance and capacitance as G, L, R & C respectively. Its characteristic impedance is ______________
in practice generators are____________
grounded and motors are ______________
grounded
A power system consists of 9 buses with 3 machines. Jacobian matrix dimension is
For stable operation of power system,synchronous coefficient should be__________
A transmission line is connected to a generator, has 0.6 p.u, impedance of 200 MVA & 11 kV base & that of generator is 0.2 p.u. on 100 MVA & 22 kV base. The total p.u. impedance on 500 MVA, 33 kVbase is___________
In a 1φ transmission system, the distance between two conductors is 1m and the diameter of each conductor is 4 cm. The net inductance of each conductor is
A transmission line has impedance as 200 Ω is terminated with a cable which has impedance as 40 Ω. The coefficient of refraction of current and that of voltagerespectively___________
An alternator has positive, negative and zero sequence impedances as j0.25, j0.25 and j0.5 respectively, is grounded with an impedance of j0.2. For a LLG fault on phase ‘b’ and ’c* the positive sequence current ofthe network is____________
The Y bus & voltages of a power system given is below. The reactive power of bus 2 is _______________
On a generator O.C. and S.C tests were conducted and the results are given in below:
O.C. test lf = 2.0A
S.C test I, = 0.5A
If the rating of generator is 100 MVA, its S.C. MVA is____________
A motor receiving 50% of the power that is capable of receiving from an infinite bus. If the load on the motor is increased to 75% of its rating, the maximum value of rotorangle during rotor swinging is_____________
An alternator and synchronous motor each rated for 50 MVA, 13.2 kV having subtransient reactance of 20% are connected through a transmission link of 10% on the base of machine ratings. The motor acting as a load of 35 MW at 0.9 p.f. lag and the terminal voltage is 12.5 kV.
Q.
If a 3 phase fault takes place at motor terminals, the subtransient fault current is
An alternator and synchronous motor each rated for 50 MVA, 13.2 kV having subtransient reactance of 20% are connected through a transmission link of 10% on the base of machine ratings. The motor acting as a load of 35 MW at 0.9 p.f. lag and the terminal voltage is 12.5 kV.
Q.
In the above problem the subtransientcurrent of motor is____________
Match List-I (Hydro turbine) with List-ll (Operating speed) and select the correct answer
A 3φ transposed transmission line has self impedance of j20 Ω and mutual impedance of j8 Ω. Its zero sequence impedance and positive sequence impedance respectively, are___________
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