A magnetic field line is used to find the direction of? Mark as favorite Copy Link A bar magnet Magnetic field A compass needle South-north Check Answer
By which instrument, the presence of magnetic field be determined? Mark as favorite Copy Link Ammeter Galvanometer Voltmeter Magnetic Needle Check Answer
Overloading is due to? Mark as favorite Copy Link accidental hike in supply voltage fault in the appliances Insulation of wire is damaged All of the above Check Answer
In electric motor, to make the coil rotating continuously in the same direction, current is reversed in the coil after every half rotation by a device called? Mark as favorite Copy Link armature slip ring commutator carbon brush Check Answer
The most important safety method used for protecting home appliances from short circuiting or overloading is? Mark as favorite Copy Link Use of fuse Use of electric meter Earthing Use of stabilizers Check Answer
Who has stated the Right hand Thumb Rule? Mark as favorite Copy Link Einstein Orsted Maxwell Fleming Check Answer
Which of the following statement is or are correct? Mark as favorite Copy Link Commutator rings reverse the direction of current flowing through the coil after every half rotation of the coil. A motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it a force exerted on the coil which rotates it continuously. A motor is a device which converts electrical energy to mechanical energy. All the above. Check Answer
What happens to the current in short circuit? Mark as favorite Copy Link increases heavily vary continuously does not change reduces substantially Check Answer
Which of the given correctly describes the magnetic field near a long straight wire? Mark as favorite Copy Link The field consists of concentric circles centred on the wire The field consists of radial lines originating from the wire The field consists of straight lines parallel to the wire The field consists of straight lines perpendicular to the wire Check Answer
A TV set consumes an electric power of 230 watts and runs on 230 volts mains supply. The correct fuse for this TV set is? Mark as favorite Copy Link One A Two A Three A Five A Check Answer