On which of the following factor/factors the speed of a DC motor depends upon? Armature current. Applied voltage. All of these. Field flux. TRUE ANSWER : ? YOUR ANSWER : ?
In speed control of DC Series motor, speed lower than the rated speed can be obtained by Any of the above. Connecting an additional resistance in the field circuit. Connecting an additional resistance in stator circuit. Connecting an additional resistance in the armature circuit. TRUE ANSWER : ? YOUR ANSWER : ?
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value? 0.4 0.2 0.04 0.02 TRUE ANSWER : ? YOUR ANSWER : ?
In a transformer which of the following losses are zero? All of these Copper loss Iron loss Rotational loss TRUE ANSWER : ? YOUR ANSWER : ?
If a DC Series motor is connected across an AC supply it will not run. run at lower speed. run at normal speed. burn. TRUE ANSWER : ? YOUR ANSWER : ?
The main purpose of providing tertiary winding in a three phase transformer is None of these to carry extra load. to suppress harmonic and unbalance in voltage. to interconnect three voltage systems. TRUE ANSWER : ? YOUR ANSWER : ?
Generator works on the principle of production both A and B. None of these static induced emf. dynamically induced emf. TRUE ANSWER : ? YOUR ANSWER : ?
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will run in a direction opposite to previous one. get damaged. not run. continue running in the same direction as before. TRUE ANSWER : ? YOUR ANSWER : ?
What is the full form of MNP? Magnetic neutral pole. Magnetic neutral plane. Magnetic field neutral plane. Magnetic field neutral pole. TRUE ANSWER : ? YOUR ANSWER : ?
What is the effect of armature reaction ? None of the options. Both option B and C. Armature flux distorts the main field flux. Armature flux weakens the main field flux. TRUE ANSWER : ? YOUR ANSWER : ?