The welding electric circuit is______ Never Earthed Always Earthed None of these Through cables Only TRUE ANSWER : ? YOUR ANSWER : ?
In a synchronous Motor, the damping winding is generally used to Provide starting torque Reduces the Noise Level Prevent hunting and provide starting Torque Reduces the eddy current TRUE ANSWER : ? YOUR ANSWER : ?
A 40KVA transformer has a core loss of 450 W and total loss of 800 W. Find the copper loss for Maximum efficiency 350 W 300 W 450 W 800 W TRUE ANSWER : ? YOUR ANSWER : ?
Determine the phase angle (in degrees) of a balanced 3-phase star connected system, if the first and the second wattmeter show reading of 200 W and 1200 W respectively 65 78 84 51 TRUE ANSWER : ? YOUR ANSWER : ?
Calculate the induced emf (in V) in the inductor of a series RL circuit having the inductance of 1.8 H and resistance of 90 Ohms after 20 milli-seconds when supplied by a 20 V DC source 20 10.03 14.76 7.36 TRUE ANSWER : ? YOUR ANSWER : ?
In a synchronous motor running with the fixed excitation, when the load is increased two times, its torque angle becomes approximately Half Twice Four Times No Change TRUE ANSWER : ? YOUR ANSWER : ?
For Proper Operation of the transistor, its collector should have Proper Forward Bias Proper Reverse Bias None of these Very small size TRUE ANSWER : ? YOUR ANSWER : ?
Power consumed by a balanced star connected 3-phase load is measured using the two-wattmeter method. The phase voltage and phase current in the load is 220V and 10 A respectively. What will be the difference in reading (in W) of the two wattmeters, if the power factor of the system is 0.8 Lagging? 3048.4 3810.5 2286.3 2861.2 TRUE ANSWER : ? YOUR ANSWER : ?
Scott connections are used for Three Phase to Single Phase transformation Any of the above Single-phase to three-phase transformation Three-phase to two-phase transformation TRUE ANSWER : ? YOUR ANSWER : ?
Under the no-load condition, the current in a transmission line is due to Corona effect Spinning Reserve Back Low from the earth The capacitance of the line TRUE ANSWER : ? YOUR ANSWER : ?