For measurement of which of the following is a Low Power Factor (LPF) wattmeter NOT suitable?
Question 3
Suppose in a application both input and output resistance (impedance) required are very high, in feedback amplifier, which feedback amplifier is the most appropriate choice.
Question 4
Three equal impedance are first connected in delta across a 2-phase balanced supply. If the same impedances are connected in star across the same supply then,
Question 5
When a short-circuit test is conducted on a single-phase transformer, 30% of the rated voltage is required to allow full load current. The short circuit power factor is found to be 0.2. The percentage regulation at UPF is
Question 6
The below circuit shows a s-phase system having a balanced self-inductive reactance of XL per phase a mutual reactance of Xm between pairs of phases. The line currents are Ia, Ib and Ic and they may be unbalanced.
The series voltage-drop relations would be
Vaa′ = Ia XL + Ib Xm + Ic Xm
Vbb′ = Ia Xm + IbXL + IcXm
Vcc′ = Ia Xm + Ib Xm + IC IL
The positive, negative, and zero-sequence reactance X1, X2 and X0, respectively = would be
Question 7
An energy meter makes 100 revolutions of its disc per unit of energy. The number of revolutions made by the disc during one hour when connected across 210V source and drawing a current of 20A at 0.8 p.f. leading is
Question 8
A voltage of V =100∠30o is applied to an impedance Z = 3 + j4. Which one of the following is the power triangle?
Question 9
Consider following parameters:
1. Commutator speed of rotation = 800 rpm
2. Commutator diameter = 0.5 m
3. Width of Brush = 1.5 cm
Then time of commutator is a × 10–3 sec. Then the value of ‘a’ is
Question 10
The steady state error of a unity feedback system having forward path gain
Question 11Multiple Correct Options
For a power system consider following parameters as:
Total Buses = 300
Generator Buses = 20
Reactive power support buses = 25
Fixed shunt capacitor buses = 15
For newton-Rapson method is used, then choose the correct option(s):
Question 12
For the given signal x(t), which of the given following is correct?
