Single Phase Inverter Question & Answers February 22, 2023 By Wat Electrical This article lists 75 Single Phase Inverter MCQs for engineering students. All the Single Phase Inverter Questions & Answers given below include a hint and a 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 on the fundamentals of Single Phase Inverter. A device that converts DC to AC-type current at a specific frequency or voltage is called an inverter. As in AC power, a variable voltage and variable frequency are required. The power source, transformer, and transistors are the components of an inverter. They are classified based on properties such as output characteristics (Square wave, sine wave, modified sine wave), and source type (current source, voltage source). The load connected (Single phase, Three phases), and output characteristics. A single-phase inverter is further classified as half bridge and full bridge; whereas a three-phase is further classified as 180 degrees and 120 degrees. Uninterruptible power supplies, solar power systems, and SMPS are a few of the applications of single-phase inverters. The benefits of inverters include effective cooling, compatibility for larger applications, and eco-friendly. The disadvantages are high repair conditions and maintenance, quite expensive. 1). An Inverter is a device which transduces __? Variable voltage and power Variable voltage and frequency Voltage and power Voltage and current Hint 2). What are applications of Inverter? Solar power converter Electric vehicle HDVC (High voltage direct current) All the above Hint 3). What are the types of inverters? Voltage source inverter Current source inverter Phase inverter All the above Hint 4). Which are types of load based inverters are present? Single phase Three phase Multiple phase Both a and b Hint 5). Which of the following are single phase inverter? Half bridge inverter Full bridge inverter 180 degree mode inverter Both a and b Hint 6). In inverters output AC power controls which parameter? Frequency Current Voltage Power Hint 7). In HDVC (High voltage direct current), what is at the sending end? Sending end – Inverter Sending end – Power Sending end – Switch Sending end – Rectifier Hint 8). What is the main drawback of power electronics is ___? Harmonics (Not A Perfect Sinusoidal) Frequency Rectangle Wave Triangular wave Hint 9). In inverter, what is the role of MOSFET? It blocks the forward voltage It blocks the resistance It converts AC to DC power To blocks the reverse voltage Hint Read more about Power MOSFET 10). How many types of current source inverters? Single phase current source inverter Single phase Auto-communicated sequential inverter Dual phase Auto-communicated sequential inverter Both a and b Hint 11). A current source inverter is also called? Current fed inverter Current block inverter Power current based inverter All the above Hint 12). In Current Source Inverter (CSI), current (I0) is directly proportional to _? Current source Frequency Voltage All the above Hint 13). In Voltage Source Inverter (VSI), the devices used are? Unipolar and Unidirectional Unipolar and Bidirectional Bipolar and Unidirectional Bipolar and Bidirectional Hint 14). In Current Source Inverter (CSI), the devices used are ? Unipolar and Bidirectional Unipolar and Unidirectional Bipolar and Bidirectional Bipolar and Unidirectional Hint 15). In Voltage source inverter (VSI), it has ---------- short circuit condition? Good short circuit protection Severe short circuit No short circuit All the above Hint 16). Which of the following are the examples of AC power ___? Radios Lamps Motors All the above Hint Read more about DC Motors 17). If voltage source is short circuited, How the current flows? Current flows in high amount Current does not flow Moderate flow of current All the above Hint 18). In Current Source Inverter (CSI), (V0 ) voltage depends on ? V0(voltage) depends on capacitor V0(voltage) depends on inductor V0(voltage) depends on load V0(voltage) depends on frequency Hint 19). In Single phase half bridge inverter. Which are the components used? 2 switches and 2 diodes 3switches and 2 diodes 2 switches and 3 diodes 3 switches and 3 diodes Hint 20). In single phase half bridge inverter, how is the diode and switch are connected? As antiparallel diode and switch as bipolar and unidirectional As parallel diode and switch as unipolar and bidirectional As antiparallel diode and switch as unipolar and bidirectional As serial diode and switch as bidirectional Hint 21). The difference between the half bridge and full bridge single phase inverter is ? Maximum value of output voltage Minimum value of output voltage Same as output voltage Maximum resistance Hint 22). In a either positive/negative bridge single phase inverter, peak voltage will be ? Peak voltage is zero Peak voltage is twice of DC supply type voltage Peak voltage is = 1/2 DC supply type voltage Peak voltage is same as DC supply type voltage Hint 23). A full bridge type inverter, peak voltage will be ? Peak voltage = 1/2 DC supply voltage Peak voltage = DC supply voltage Peak voltage =0 Peak voltage = 2 DC supply voltage Hint 24). Anti-parallel diode does not impact ______ and ____ in reverse flow? Output voltage, Current flow Input voltage, Current flow Output voltage, Voltage flow Input voltage, Voltage flow Hint 25). Which of the single phase inverter has greater efficiency? Lower than single phase half bridge inverter Same as single phase half bridge inverter More than single phase half bridge inverter all the above Hint Single Phase Inverter MCQs for Students 26). A single phase full bridge inverter generates? Square wave Sine wave Triangular wave Cos wave Hint 27). How many terminals does a transistor comprises of? 1 2 3 0 Hint 28). What is the Noise quantity of single phase full bridge inverter? Zero Low High All the above Hint 29). What is the maximum value of output voltage in single phase full bridge inverter? Peak voltage = zero Peak voltage =2 DC supply voltage Peak voltage = DC supply voltage Peak voltage =1/2 DC supply voltage Hint 30). What is the main application of single phase full bridge type inverter? Used in high voltages Used in solar inverters Used in AC variable motors All the above Hint 31). How many switches and diodes are used in single phase full bridge inverter? Four diodes and Four switches Four diodes and Two switches Two diodes and Four switches Two diodes and Two switches Hint 32). Disadvantage of single phase full bridge inverter is? Losses and noises are high compared to single phase half bridge inverter More frequency compared to single phase half bridge inverter It’s a energy-efficient All the above Hint 33). What is the advantage of single phase full bridge inverter? Losses and noise are less It’s not energy-efficient Suitable for high input voltage All the above Hint 34). In single phase full bridge inverter, how about the current ratings in the circuit? . The current rating of the circuit is more than the load current The current rating of the circuit is less the load current The current rating of the circuit is less or equal to the load current The current rating of the circuit is equal to the load current Hint 35). In single phase full bridge inverter, how about the current ratings in the circuit? The current rating of the circuit is more than the load current The current rating of the circuit is less the load current The current rating of the circuit is less or equal to the load current The current rating of the circuit is equal to the load current Hint 36). What is leading power factor load? A underdamped condition A overdamped condition Moderately damped condition All the above Hint 37). What is w0? Frequency Watt Power Fundamental frequency Hint 38). Self-commutation is possible only in? Laging power factor load or underdamped system Leading power factor load or underdamped system Laging power factor load or overdamped system All the above Hint 39). What is the output of single phase full bridge inverter ? -VDC +VDC Zero All the above Hint 40). What is the condition angle of each diode in single phase full bridge inverter? φ π – φ π + φ π Hint 41). How many inverters are used in 3 phase bridge inverter? 3 2 6 o Hint 42). What is the time gap between input and output thyristor in 180 degree mode? Vdc/2 -Vdc/2 Vdc 0 Hint 43). Which of the following type of inverter source overcomes 180 degree mode? 120 degree mode 90 degree mode 30 degree mode 0 degree mode Hint 44). In single phase inverter, when the two switches are off and one diode D2 is on and its conducting, then what is the output current, V0? Vdc/2 -Vdc/2 Vdc 0 Hint 45). In single phase inverter, when the two switches and two diodes are turned off, then what is the output current, V0 ? Vdc/2 -Vdc/2 Vdc 0 Hint Single Phase Inverter MCQs for Interviews 46). In single phase inverter, when the two switches and two diodes are turned off, then what is the output power, P0? Vdc/2 -Vdc/2 Vdc 0 Hint 47). In single phase inverter, when the two switches and two diodes are turned off, then what is the output current, I0? Vdc/2 -Vdc/2 Vdc 0 Hint 48). In which diode current flows through semiconductor on positive polarity and on current flows through antiparallel diode on negative polarity? Freewheeling PN Zenor All the above Hint 49). What is regenerative state? The active power is delivered from the load to source The active power is same as the load to source the active power is delivered from the load All the above Hint 50). In resistive load. How about the characteristics of diodes? Freewheeling or antiparallel diode dose not conduct Freewheeling or antiparallel diode conducts Freewheeling or antiparallel diode is zero All the above Hint 51). In pure inductive load, how about the output voltage characteristics is? Square type wave Triangular type wave Sine type wave All the above Hint 52). In HDVC (High voltage direct current), what is at the receiving end? Rectifier Inverter Power Inverter Hint 53). Which of the following are the types of output characteristics based inverters? Square type wave inverter Sine type wave inverter Modified sine wave inverter All the above Hint 54). Which of the following are the types of PWM technique based inverters? SPWM MPWM MSPWM All the above Hint 55). Which of the following are the types of inverters based on output quantity level? Regular 2 level inverter Multiple level inverter Single level inverter Both a and b Hint 56). Which of the following are the types of inverters based on output characteristics? Square wave Sine wave Modified sine wave All the above Hint 57). In Current source inverter (CSI), How is the short circuit condition? Good short circuit protection Severe short circuit No short circuit All the above Hint 58). Which of the following is the disadvantage of SPWM? Greater vibration Greater harmonics Greater oscillations All the above Hint 59). Frequency is expressed in terms of? Hertz Seconds Meters Farads Hint 60). Which of the following is the formula of number of cycles per half cycle in a MPWM? fc/2f0 -fc/2f0 1/ fc2f0 -1/fc 2f0 Hint 61). Which of the following are peak levels of regular two level based inverter? Positive peak voltage Negative peak voltage Zero peak voltage Both a and b Hint 62). Which of the following are the types of multilevel inverter? Hybrid Cascaded Diode clamped All the above Hint 63). What is the average voltage of single phase half bridge inverter? 0 1 2 Infinite Hint 64). Which of the following is not a inverter property? AC to DC DC to AC Power generation Both a and c Hint 65). Which of the following is a phase angle of 3 phase inverter? 120 90 160 200 Hint 66). Which of the following forms inverter circuit? Electric Mechanic Electrical Both a and b Hint 67). Which of the following type of inverter do not use moving components? Static Dynamic Constant Both a and c Hint 68). Which is the wave shape generated by low sensitive type applications? Square Sine Rectangle Ramp Hint 69). A duty cycle of 50% in a square wave is _______% THD of sine wave? 50 48 47 Hint 70). Duty cycle is also termed as? Power cycle Period cycle Aperiod cycle All the above Hint 71). Which of the following is the formula of duty cycle? D=PW/T * 100% D=PW/T * 100% D=-PW/T D=-PW/T * 10% Hint 72). Which of the following is the representation of duty cycle? a α Gama Ø Hint 73). On which of the following factors does active inverter property depends on? Battery power Power drawn Components Both a and b Hint 74). Which of the following is the formula to calculate inverter battery capacity? Battery capacity = -Total load * usage time / input voltage Battery capacity = Total load - usage time / input voltage Battery capacity = Total load + usage time / input voltage Battery capacity = Total load * usage time + input voltage Hint 75). Which of the following is the units of power? Watts Seconds Meters Ohms Hint Read more about Power Triangle For More MCQs Semiconductor Diode MCQs DC Power Supply MCQs Rectifier MCQ's Time's up
