Two-wattmeter method is used to measure the power taken by a 3-phase induction motor on no load. The wattmeter readings are 400 W and -50 W. Calculate the reactive power taken by the load 350√3 VAR 450/√3 VAR 450√3 VAR 350/√3 VAR TRUE ANSWER : ? YOUR ANSWER : ?
Medium voltage covered conductors (MVCC) are produced in voltage rating beyond 200 kV between 132 kV to 200 kV between 6.6 kV to 33 kV less than 3.3 kV TRUE ANSWER : ? YOUR ANSWER : ?
The miniature circuit breaker (MCB) with ____ trip characteristics trips instantaneously when the current flowing through it reaches between 10 to 20 times the rated current. Class Z Class C Class D Class B TRUE ANSWER : ? YOUR ANSWER : ?
The threshold voltage of an N-channel enhancement mode MOSFET is 0.5 V. When the device is biased at a gate voltage of 3 V, pinch-off would occur at a drain voltage of 3.5 V 4.5 V 1.5 V 2.5 V TRUE ANSWER : ? YOUR ANSWER : ?
A 50 Hz synchronous generator is connected to an infinite bus through a line. The p.u. reactances of generator and the line are j0.4 p.u. and j0.2 p.u. respectively. The generator no load voltage is 1.1 p.u. and that of infinite bus is 1.0 p.u. The inertia constant of the generator is 4 MW-sec/MVA. Determine the frequency of natural oscillations if the generator is loaded to 60% of its maximum power transfer capacity and small perturbation in power is given. 1.8 Hz 1.2 Hz 1.6 Hz 0.8 Hz TRUE ANSWER : ? YOUR ANSWER : ?
Find the current through the resistor and the capacitor for the current shown in figure The switch is closed at t = O and initial change in the capacitor is zero. I(t) = 5e⁵⁰⁰⁰ᵗ A. I(t) = 10(1 - e⁵⁰⁰⁰ᵗ) A I(t) = 10e⁵⁰⁰⁰ᵗ A. I(t) = 5(1 - e⁵⁰⁰⁰ᵗ) A TRUE ANSWER : ? YOUR ANSWER : ?
A rectangular conductor is 1.6 inches wide and 0.25 inch thick. What is its area in square mils? 40000 square mils 400000 square mils 4000 square mils 400 square mils TRUE ANSWER : ? YOUR ANSWER : ?
A 200/400 V, 20 kVA, 2-winding transformer is connected as an auto-transformer to transform 600 V to 200 V. Calculate the kVA rating of the auto-transformer. 30 kVA 60 kVA 50 kVA 25 kVA TRUE ANSWER : ? YOUR ANSWER : ?
In a 3-phase, 4-wire, 400/230 V system, a lamp (L₁) of 100 W is connected to one phase and neutral and a lamp (L₂) of 150 W is connected to the second pahse and neutral. If the neutral wire is disconnected accidently, what will be the voltage across a 150 W lamp (L₂)? 180 V 160 V 120 v 240 V TRUE ANSWER : ? YOUR ANSWER : ?