31. Four options have been given, out of which three are alike in some manner
and one is different. Select the odd one ?
An electric potential (also called the electric field potential, potential drop, or the electrostatic potential) is the amount of work needed to move a unit of electric charge from a reference point to a specific point in an electric field without producing an acceleration.
Its unit is Volt (V).
Voltage, electric potential difference, electric pressure or electric tension is the difference in electric potential between two points, which is defined as the work needed per unit of charge to move a test charge between the two points.
Its unit is Volt (V).
Electromotive force is defined as the electric potential produced by either electrochemical cell or by changing the magnetic field. EMF is the commonly used acronym for electromotive force. A generator or a battery is used for the conversion of energy from one form to another.
Its unit is Volt (V).
Electric flux is the rate of flow of the electric field through a given area (see ).
Electric flux is proportional to the number of electric field lines going through a virtual surface.
he SI unit of electric flux is N.m2/C.
32. Four relations are given below. Identify the correct relation regarding a
transistor ?
The emitter current (IE) of a transistor has two components such as base current (IB) and collector current (IC).
The base current (IB) is about 2% of the emitter current (IE), but the collector current (Ia) is about 98% of the emitter current (IE).
∴ IE > IC > IB
IE = IB + IC
33. A long straight wire carries a current I = 10A. At what distance is the
magnetic field H = 1 A/m ?
the magnetic field strength H. and current I through a long, straight wire produces a magnetic field with strength H = I/2πr at a distance r from the wire. H = 1 A/m
I = 10 A
H = I/2πr
1 = 10/2πr
r = 10/2π
34. When capacitors are connected in series across DC voltage ?
Two or more capacitors in series will always have equal amounts of coulomb charge across their plates.
As the charge, ( Q ) is equal and constant, the voltage drop across the capacitor is determined by the value of the capacitor only as V = Q ÷ C.
35. ---comes under the category of high frequency heating ?
Eddy current heating is also known as the induction heating. The material to be heated is placed inside the coil.
The heat in the material to be heated is produced by eddy currents.
Power loss due to eddy currents is eddy current loss and appears in the form of heat.
36. Oxygen is a/an…………gas ?
Oxygen is a paramagnetic gas and is attracted into a strong magnetic field.
37. The urban service speed-time curve has no ?
The speed–time curve urban or city service is almost similar to suburban service and is shown in Fig.
In this service also, there is no free-running period.
The distance between two stop is less about 1 km.
38. The conductor tied between two supports takes the shape of a 'catenary' due
to ?
A conductor, due to sag between two supports, takes the form of catenary
39. The wattage rating of a single phase induction motor used as a ceiling fan
will be in the range of ?
The wattage rating for a ceiling fan motor is in the range of 50 to 150 W.
if the ceiling Fans size ranges from 36 inches to 56 inches then the total wattage use is 55 to 100 watts.
A 48-inch ceiling fan will use 75 watts.
40. Which of the following is NOT related to transmission and distribution of
electric power ?
The stroboscopic effect is a visual phenomenon that happens when a blinking light source glows an object in movement, generating a sequence of samples. The stroboscopic effect is based on Illuminance hence it is not related to the transmission and distribution of electric power
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