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DC Generator Question & Answers

November 1, 2021 By Wat Electrical

This article lists 100 DC generator MCQs for engineering students. All the DC generator Questions & Answers given below include a solution and link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on the DC generator topic which is core in Electrical Engineering.

Generators are separate electrical devices or machines, used to supply electricity once electricity from the nearby grid is not available. These are classified into two types based on their output like AC generators and DC generators.

These generators play a key role by providing backup power to homes, businesses, industries, organizations when there is no power supply. The main function of Generators is to change the energy from mechanical or chemical into electrical.

1). For large DC loads, we connect DC generators in--------
HintIn this connection, the flow of current will be in different paths
2). For connecting two DC generators in parallel they should have ---?
HintThey must have similar voltage characteristics
3). Lap windings in DC generators are used for---?
HintFor maximum current and less voltage
4). For parallel connected Dc generators, the summation of the current carried by them is equal to---?
HintThe current at electric load
5). For the DC generator, the resistance of ------is critical?
HintThe field resistance is critical
6). In an idle DC generator, the % of regulation is...?
HintThe regulation is zero
7). The Field coils of the DC generator are made up of ----?
HintThe chemical element of this material is Cu
8). The first electrical generator was invented by…?
HintThe first electric generator name is Faraday disk
9). DC generators are categorized into ….. Types depending on the field excitation methods?
HintThey are permanent magnets, self-excited & separately excited
10). The material used to make the core lamination is?
HintThese are ferritic alloys of silicon & iron
11). If the generators are need to run parallel then which of the following type is used?
HintIn this type of generator, both the windings are connected in parallel
12). If the critical resistance of a DC generator is increased then…?
HintThe DC motor performance will be increased
13). Welding generator includes….winding?
HintThis winding includes two layers
14). The armature winding’s resistance mainly depends on…?
Hint It includes electrons as charge carriers
15). Which of the following bearings are used to give support to the rotor shaft?
HintIt is one kind of rolling-element bearing
16). The mechanical losses within DC generators are the main function of?
HintThe operating speed of any generator is 1000rpm
17). The flow of current to the external circuit in a DC generator can be given through?
HintThe main function of this is to change the alternating current into pulsating direct current
18). The material used to make a brushless dc machine is?
HintThese materials are composed of carbon atoms
19). Which of the following material is used for commutator brushes?
HintThese materials have mainly various properties & structures.
20). When the armature is….wound then equalizer rings are necessary?
HintIn electrical machines, this winding includes two layers
21). Long shunt compound generator is used in automobiles for…?
HintThis generator is used to make the battery active in automobiles
22). A DC generator can be used like a…?
HintIt is also known as a dynamoelectric amplifier
Please refer to this link to know more about  DC Generators
23). The field resistance is the critical resistance of….?
HintThey provide power continuously to power grids & electric storage instruments.
24). The working principle of dc generator is…?
HintIt is a basic law in electromagnetism
25). The regulation used in DC generators is?
HintOnly one percent of regulation is used

DC Generator MCQs for Interviews

26). Which generator is used for long transmission line feeding?
HintThese generators are also called cumulative compound generators
27). When a series generator is self-excited?
HintWhen there is no current at load then the generator will be self-excited.
28). How the lamination of a DC generator can be done to…?
HintThese losses are undesirable within electrical machines
29). In a 4-pole DC machine, the direction of all the poles are…?
HintIn four poles, alternate poles are south & north
30). In a DC generator, the generated emf is directly proportional to….?
HintIt generates a flow of current across the field
31). Which of the following generator’s terminal voltage changes when load changes?
HintThese types of generators are used as boosters
32). In which type of generator, the poorest voltage regulation is there?
HintThis type of generator includes both the series & shunt windings
33). The connection of field windings in the separately excited generator is?
HintWindings are connected in series with the source
34). The brushes in DC generators are made with…?
HintThe brushes are made with two materials
35). The connection of inter pole winding can be done in series with….winding?
HintIn this winding, the conversion of power takes place
36). A DC shunt generator is an exciter for…?
HintIt is used to connect the shaft in a steam turbine
37). In electrical machines, which of the following material is used to decrease hysteresis loss…?
HintIt is a ferritic alloy of silicon & iron
38). When the DC generator’s polarity is reversed, then,?
HintThe flow of current toward the field windings in a generator
39). Lap winding is used in which machines?
HintUsed in machines that have max current and min voltage
40). How is the magnetic field generated in DC generators?
HintThese are made with wire coils to allow the electricity supply
41). How many poles are there in small DC machines?
HintPoles are electromagnets in DC machines
42). The most commonly used DC machines are…..?
HintThe poles used in this machine are north poles
43). How many parallel paths are available in triplex wave winding…..?
HintThese are found by multiplying the available poles with the number of rotations
44). The type of generator used for welding is.?
HintIn this type of generator, both the shunt and field windings are simply connected in reverse directions.
45). Stray loss within a DC machine is the sum of …… and …..?
HintThese losses mainly occur because of the motor’s movement and alternating flux within the transformer’s core.
46). Which of the following part provides DC for a DC generator?
HintIt is a rotating electrical switch in many motors
47). In commutator segments, which of the following material is used?
HintMica is mainly used for electrical insulation
48). When dummy coils are used in a DC generator?
HintTo provide balance to the rotating part
49). Which of the following loss has the highest proportion within DC generators?
HintThis is also called armature reaction or effect
50). Which loss will be changed with the load current in DC machines?
HintThe loss of power like heat within the machine windings

DC Generator MCQs for Exams

51). What is the function of the fractional pitch in the DC generator?
HintIt protects the copper material so that sparking cannot occur
52). Why aluminum is not used as a winding within DC machines?
HintAs compared to copper, aluminum cannot be used in a fixed space
53). What is the function of frog leg winding in a DC machine?
HintIn the lap winding of DC machines, it avoids the distribution of unequal current.
54). In a DC machine, the armature MMF signal shape is?
HintIt is a non-sinusoidal waveform
55). Which of the following is used to get sparkles communication?
HintIt is used to overcome the self-induction effect for the DC machine
56). When does a series generator excite?
HintOnce the maximum current is not equivalent to zero
57). Once the field winding resistance in a DC generator is increased then the o/p voltage will be….?
HintHere, the output voltage is opposite to the resistance
58). When the generator runs on no-load then which of the following type generator will have negligible terminal voltage?
HintIn this generator, the two winding's are connected in series
59). The armature MMF in a DC machine is directed through the…axis?
HintIt is directed on the brush axis
60). The armature winding in DC machines is located on the rotor for…?
HintFor interaction purposes, it is located.
61). A machine that is used to change the energy from mechanical to electrical is called?
HintMotors and generators are called machines
62). Which generator provides stable voltage for different loads?
HintIn this generator, the terminal voltage is the same at a fixed current
63). The reciprocal of reluctance is known as?
HintThis coefficient is used to design the magnetic circuit
64). Which of the following brush has less voltage drop?
HintThese brushes includes a brush body
65). Which of the following component is used to provide DC for a DC generator?
HintIt is a rotary electrical switch
66). The brushes within a commutator mainly depend on…?
HintThe amount of controlling of current
67). How the magnetic field can be generated within DC machines?
HintThese are made with wire coils
68). In commutator segments, the insulating material used is…?
HintThis material is a group of minerals
69). Which of the following material is used to make brushes?
HintThese materials have different structures as well as properties
70). The field coils are made with?
HintThe chemical element of this material is Cu
71). What is the name of the first electrical generator?
HintThese generators produce pulsing DC using a commutator
72). The name of the first electromagnetic generator is…?
HintIt is a homopolar generator
73). The electromagnetic generator was invented in which year…?
HintIt was invented by Michael faraday
74). The function of an electric generator is quite opposite of…?
HintIt converts the energy from electrical to mechanical
75). How many categories are there in electromagnetic generators?
HintThey are alternators and dynamos

DC Generator MCQs for Quiz

76). In a DC machine, the external frame is called as?
HintIt is a stationary part in dc machines
77). How many principal components are there in DC machines?
HintSome of them are yoke, commutator, brushes, etc.
78). How the poles are connected to the yoke in DC machines?
HintThe connection of poles can be done using the welding process
79). The field system in DC generators is used to generate?
HintThis has a similar magnitude & direction
80). Practical DC machines include….?
HintThese ranges from 0.5 mm - 1.5 mm
Please refer to this link to know more about DC Machine
81). Which of the following device is used to convert AC to DC and DC to AC?
Hint: It is a mechanical rectifier
82). How many types of losses are there in the DC machine?
HintThey are copper, iron & mechanical
Please refer to this link to know more about Types of Losses in DC Machine
83). The principle used by the generator to convert the energy is?
HintThis was discovered by Michael Faraday
84). In a generator, when the power loss occurs within the armature winding then it is known as?
HintIt is an I2R loss
85). A heat loss is called as?
HintThis loss mainly occurs because of the armature’s magnetic properties
86). Which of the following construction is the main difference between practical and normal generators?
HintIn a DC machine, it is a winding
87). In the series-wound type, which of the following are connected with the armature in series?.
HintIt is an electromagnet
88). In a shunt-wound generator, the field coils are connected in shunt with…?.
HintAn object which is lifted or moved.
89). Which of the following occurs when the load changes in a generator?
HintIt is an internal action
90). Which of the following is used for increasing/reducing terminal voltage?
HintIt is an imposed action
91). When the generators are connected in parallel then they provide?
HintIt provides huge electrical energy
92). The special-purpose type DC generators are called as?
HintThese are dc machines, used for generating huge DC
93). Armature types in DC generator are?
HintThey are Gramme ring & drum type
94). Once the voltage is provided to the main windings then it is known as?
HintIt decides the direction and strength of the magnetic field
95). The generator which gets current from an external source?
HintThe coil is energized by an external source
96). Which of the following generator uses their o/p voltage to strengthen field coils?
HintThey generate EMF
97). The output changes with load currents directly in….generators?
HintIn this generator, the field coils with armature winding is connected in series
98). The distribution of actual flux in dc generators mainly depends on…?
HintIt depends on the size of an air gap
99). Which of the following material is harder in a commutator?
HintIt is stronger than copper
100). The voltage build-up in a shunt generator can be restricted by?
HintIt is measured like a percentage
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