BARC EE Quiz - 12

A network has 10 nodes 6 independent loops, the number of branches in the network will be-

A source V_S = 200cosωt delivers power to a load at power factor of 0.8 lagging. The reactive power is 300 VAR. The active power is given by?

Which among the following are suitable for improving the transient stability limits of a power system?

_{i. Increase system voltage by AVR
ii. Use high sped excitation systems
iii. Use high sped reclosing breakers
iv. Increase system frequency}

If V_S = sint V, then the current I is:

In a series R-L circuit, R = 20 Ω and L = 60 mH is given. If the current lags the voltage by 60°, the value of frequency will be-

A 230V, 3ϕ synchronous motor driving a pump is provided with a line armature are field rheostat when the rheostat is adjusted such that AC line current is minimum the ammeter reads 8.8A. What is the power being delivered to the pump, neglecting losses?

A 3-phase, 4 pole, 50Hz induction motor, during the short circuit test took, 100A, and 30 kW in case stator resistance is equal to equivalent standstill rotor resistance, compute the starting torque?

An SCR can withstand maximum junction temperature of 380K with ambient temperature of 340 K. Its thermal resistance from junction to ambient is 2°C/W. The maximum internal power dissipation allowed will be