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Single Phase Induction Motor Question & Answers

September 27, 2021 By Wat Electrical Leave a Comment

This article lists 100 Single Phase Induction Motor MCQs for Engineering Students. All the Single Phase Induction Motor Questions & Answers given below includes solution and link wherever possible to the relevant topic.

The single-phase induction motor converts electrical energy into mechanical energy, it consists of two parts namely rotor and stator.  The single-phase induction motors are not self-starting machines, if you want to rotate as a self-starting machine then we have some mechanical constructions  they are resistance split-phase, capacitor-start, capacitor start & capacitor run, and shaded pole motors

1). The single-phase induction motors are categorized into _________________
HintThe single-phase induction motors are categorized into three types they are split phase, shaded pole type, and capacitor type motors
2). Which one of the following is a type of synchronous motor?
HintThe hysteresis motor is a type of synchronous motor
3). What is the standard form of DOR?
HintThe standard form of DOR is Direction of Rotation
4). The capacitor motors are categorized into _________________
HintThe capacitor motors are categorized into three types they are capacitor start induction run, capacitor run induction motor, and capacitor start and capacitor run induction motor
5). What are the parts of the repulsion motor?
HintThe rotor, commutator, stator, and carbon brushes are the parts of the repulsion motor
6). ________________ are the two different designs of repulsion motors
HintThe brush lifting type and brush riding type are the two different designs of repulsion motors
7). ________________ are the starting methods of single-phase induction motors
HintThe split-phase, shaded pole, and reluctance start are the starting methods of single-phase induction motors
8). ________________ are the different split-phase techniques
HintThe split-phase resistance start motor, split-phase capacitor start motor, and the permanent single capacitor & capacitor start capacitor run induction motor are the different split-phase techniques
9). The repulsion motors are categorized into _________________ types
HintThe repulsion motors are categorized into two types they are repulsion start induction run motor and repulsion induction motor
10). Which one of the following motors requires DC excitation at the rotor?
HintThe synchronous motors require DC excitation at the rotor
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11). What is the standard form of SYRM?
HintThe standard form of SYRM is Synchronous Reluctance Motor
12). The starting torque is more in ______________ motor
HintThe starting torque is more in synchronous motor compare to 3-phase induction motor
13). What is the standard form of SCR?
HintThe standard form of SCR is Silicon Controlled Rectifier
14). How many states does the silicon control rectifier have?
HintThe silicon control rectifier has three states they are forward blocking mode, reverse blocking mode, and forward conducting mode
15). What are the advantages of a single-phase induction motor?
HintThe single-phase induction motors are less expensive, reliable, and easy to maintain & repair
16). ________________ are the most common applications of shaded pole motor
HintThe exhaust fans, table fans, cooling fans, etc are the most common applications of shaded pole motor
17). The permanent split capacitor motors are used to ______________
HintThe permanent split capacitor motors are used to drive refrigerator compressors and operate office machinery
18). How many centrifugal switches are required in a single-value capacitor motor?
HintThe centrifugal switches are not required in a single-value capacitor motor
19). Which one of the following motor construction is complicated?
HintThe synchronous motor construction is complicated whereas the construction of a 3-phase induction motor is easy
20). The single value capacitor motor has ______________ efficiency
HintThe single value capacitor motor has higher efficiency
21). The two value capacitor motors are used in _____________
HintThe two value capacitor motors are used in pumping equipment, air compressors, refrigeration, etc
22). The split-phase motors are used in _______________
HintThe split-phase motors are used in grinders, blowers, small drills, etc
23). In single-phase induction motor ______________ theory is used to find the performance of the 1-phase induction motor
HintIn single-phase, induction motor double-revolving field and cross-field theories  are used to find the performance of the 1-phase induction motor
24). The one phase induction motor consist cage winding on _________
HintThe one phase induction motor consists of cage winding on rotor
25). The stator core, outer frame, and stator winding are the parts of ____________
HintThe stator core, outer frame, and stator winding are the parts of the stator

Single-phase Induction Motor MCQs with Hints

26). The rotor core and rotor winding are the parts of ____________
HintThe rotor core and rotor winding are the parts of the rotor
27). The winding arrangement is complex in _________________
HintThe winding arrangement is complex in the stator
28). The single value capacitor motor has ______________ power factor
HintThe single value capacitor motor has a higher power factor
29). What is the standard form of CSIR?
HintThe standard form of CSIR is Capacitor Start Induction Run
30). The maximum power output divided by full load output is known as _____________
HintThe maximum power output divided by full load output is known as overload capacity
31). The rate power of single-phase induction motors is around ______________
HintThe rate power of single-phase induction motors is around 60W
32). The ratio of total flux around the air gap divided by area of flux path at the air gap is known as ____________ loading
HintThe ratio of total flux around the air gap divided by the area of flux path at the air gap is known as specific magnetic loading
33). The repulsion induction motor consists of _____________
HintThe repulsion induction motor consists of two rotor windings, stator winding, and short-circuited set of two brushes
34). The single value capacitor motor has ______________ pull out torque
HintThe single value capacitor motor has higher pull out torque
35). The one phase induction motor consists single-phase winding on _________
HintThe one phase induction motor consists of single-phase winding on the stator
36). How many types of induction motor rotors are there?
HintThere are two induction motor rotors are there they are wound rotor or slip ring and squirrel cage rotor
37). The speed of the induction motors (IM) is given as _____________
HintThe speed of the induction motors (IM) is given as N=120f/p(1-S)
38). What are the disadvantages of an induction motor?
HintThe disadvantages of an induction motor are it has low efficiency, low power density, and large size
39). The magnitude of step angle for PM and VM stepper motors is given by ______________
HintThe magnitude of step angle for PM and VM stepper motors is given by 360/(number of starter phases)*(number of rotor poles)
40). What are the advantages of a hybrid stepper motor?
HintThe hybrid stepper motor has high efficiency, small step length, and less tendency to resonate
41). What are the disadvantages of a hybrid stepper motor?
HintThe hybrid stepper motor are costly and have high inertia
42). The resistance start motor is also known as ______________ motor
HintThe resistance start motor is also known as split phase motor
43). What is the standard form of CSCR?
HintThe standard form of CSCR is Capacitor Start Capacitor Run Induction Motor
44). What is the standard form of WRIM?
HintThe standard form of WRIM is Wound Rotor Induction Motor
45). The speed control is not possible in ______________ motor
HintThe speed control is not possible in a synchronous motor
46). In single phase motor the starting winding is placed in _________________
HintIn a single-phase motor the starting winding is placed in the stator
47). _____________ methods are employed for speed control of universal motors
HintThe resistance method and tapping field methods are employed for speed control of universal motors
48). The universal motors are manufactured in ____________________ types
HintThe universal motors are manufactured in two types they are distributed field compensated type and concentrated pole, and non-compensated field
49). The split-phase induction motors are used in _____________
HintThe split-phase induction motors are used in blowers, lathe machines, grinders, etc

Read more about Electric Motor

50). What is the standard form of PSC motor?
HintThe standard form of PSC motor is Permanent Split Capacitor

Single-phase Induction Motor MCQs for Exams

51). What are the advantages of a permanent split capacitor motor?
HintThe permanent split capacitor motor has high efficiency, higher pull out torque, and the centrifugal switch is not required
52). What is the standard form of PSC?
HintThe standard form of PSC is Permanent Split Capacitor Induction Motor
53). The repulsion type motors are divided into ___________ categories
HintThe repulsion type motors are divided into four categories they are compensated repulsion motor, repulsion IM, repulsion motor, and repulsion start induction run motor
54). The horsepower ranges of split-phase motors is from ____________
HintThe horsepower ranges of split-phase motors is from 1/20 to 1/3
55). What is the standard form of WRSM?
HintThe standard form of WRSM is Wound Rotor Synchronous Motor
56). The load starting ability is ______________ in capacitor start induction run
HintThe load starting ability is hard in capacitor start induction run
57). The starting current in split-phase motors is __________
HintThe starting current in split-phase motors is high 5 to 7 times of full load current
58). The capacitor start capacitor run motor used in ______________
HintThe capacitor start capacitor run motor used in barn cleaner, conveyor, elevator, etc
59). Which one of the following motors has low reliability?
HintThe brushed DC motors have low reliability compared to other motors
60). Which one of the following motors has poor field weakening?
HintThe both brushed DC and PMSM motors have poor field weakening
61). The brushed DC motor have __________ overloading capacity
HintThe brushed DC motor has a low overloading capacity
62). The repulsion motor consist of _____________ parts
HintThe repulsion motor consist of one rotor, commutator, set of brushes, and one stator winding parts
63). The horsepower ranges of capacitor start induction run motors is from ____________
HintThe horsepower ranges of capacitor start induction run motors is from 1/8 to 10
64). The starting current in capacitor start induction run motors is __________
HintThe starting current in capacitor start induction run motors is medium 3 to 6 times of full load current
65). The brushed DC motor have __________ heat dissipation
HintThe brushed DC motor has low heat dissipation
66). The electrical noise in induction motor is ____________
HintThe electrical noise in induction motor is low compare to other motors
67). What is the standard form of SCIM?
HintThe standard form of SCIM is Squirrel Cage Induction Motor
68). The load starting ability is ______________ in split-phase motor
HintThe load starting ability is easy in split-phase motor
69). Which one of the following can’t be used as a synchronous condenser?
HintThe induction motor can’t be used as a synchronous condenser
70). The speed in 3-phase induction motor is ______________
HintThe speed in 3-phase induction motor decreases with load
71). The repulsion start induction run motor consist of _____________ parts
HintThe repulsion start induction run motor consist of one rotor, commutator, centrifugal mechanism, and one stator winding parts
72). The horsepower ranges of capacitor start capacitor run motors is from ____________
HintThe horsepower ranges of capacitor start capacitor run motors are from 1/2 to 20
73). The starting current in capacitor start capacitor run motors is __________
HintThe starting current in capacitor start capacitor run motors is medium 3 to 5 times of full load current
74). What is the standard form of SPMSM?
HintThe standard form of SPMSM is Surface Permanent Magnet Synchronous Motor
75). What are the advantages of the brushed DC motor?
HintThe brushed DC motors have a low initial cost, and the speed control is simple in brushed DC motor

Single-phase Induction Motor Important MCQs

76). What are the advantages of hysteresis motor?
HintThe advantages of hysteresis motor are it has low noise, has no vibration, and has high starting torque
77). The resolution or step number is defined as a ratio of ___________________
HintThe resolution or step number is defined as a ratio of the number of steps divided by the number of revolutions of the rotor
78). What are the disadvantages of DC motors?
HintThe disadvantages of DC motors are it has low-speed range, low efficiency, and reliability
79). The core losses are high in ______________ motor
HintThe core losses are high in brushless DC motors
80). What is the standard form of IPMSW?
HintThe standard form of IPMSW is Interior Permanent Magnet Synchronous Motor
81). What are the advantages of the brushless DC motor?
HintThe advantages of the brushless DC motor are it has a long life span, high efficiency, and has low maintenance
82). The switching losses are high in ______________ motor
HintThe switching losses are high in permanent magnet synchronous motors
83). What are the disadvantages of the permanent magnet synchronous motor?
HintThe disadvantages of the permanent magnet synchronous motor are it has a high cost, high stator core loss at high speed, and limited speed range
84). The brushes are present in _____________ motor
HintThe brushes are present in the slip ring motor whereas the brushes are not present in squirrel cage motors
85). In which motor the speed control is not possible?
HintThe speed control is not possible in squirrel cage motors
86). In a single-phase induction motor the stator outer diameter is around _____________
HintIn a single-phase induction motor the stator outer diameter is around 75mm
87). What are the advantages of switched reluctance motors?
HintThe advantages of switched reluctance motor are it has high-efficiency, long life span, and has low-cost
88). In single phase induction motor the range of speed is between _____________
HintIn single-phase, induction motor the range of speed is between 1455-1465rpm
89). The slip ring and brushes are not present in __________ motor
HintThe slip ring and brushes are not present in the squirrel cage motor
90). The copper losses are high in _____________ motor
HintThe copper losses are high in slip ring motor
91). What is another name for slip ring motor?
HintAnother name for slip ring motor is phase wound motor
92). What is the standard form of PMSW?
HintThe standard form of PMSW is Permanent Magnet Synchronous Motor
93). What are the advantages of the AC polyphase squirrel cage?
HintThe advantages of the AC polyphase squirrel cage are it has low-cost, robust, reliable, and it is self-starting
94). In single-phase induction motors the air gap distance is around ______________
HintIn single-phase induction motors the air gap distance is around 0.25mm
95). The frequency in single-phase induction motors is ____________
HintThe frequency in single-phase induction motors is 50HZ
96). In a single-phase induction motor the rotor outer diameter is around _____________
HintIn a single-phase induction motor the rotor outer diameter is around 44.5mm
97). What are the disadvantages of switched reluctance motors?
HintThe disadvantages of switched reluctance motor are it has low efficiency, low power density, and has high torque ripple and noise
98). The input voltage of single-phase induction motors is _____________
HintThe input voltage of single-phase induction motors is 230V
99). What is the standard form of FEFSM?
HintThe standard form of FEFSM is Field Excitation Flux Switching Motor
100). In a single-phase induction motor the rated torque is around _____________
HintIn a single-phase induction motor the rated torque is around 0.4Nm

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