PMMC Instrument Question & Answers May 23, 2022 By WatElectronics This article lists 100 PMMC Instrument MCQs for Engineering Students. All the PMMC Instrument Questions & Answers given below includes solution and link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams and interviews, or professionals who would like to brush up on the fundamentals of the PMMC instrument. The PMMC instrument and dynamometer are two types of moving coil instruments. The PMMC is one of the moving coil instruments used only for DC. The dynamometer is also one of the moving coil instruments but this instrument is used on either ac or dc. The instruments are of two types they are absolute instruments and secondary instruments. The recording, indicating, and integration are the types of secondary instruments. The wattmeter and ampere-hour meters are examples of the secondary instruments,s, and the tangent, the galvanometer is an example of an absolute instrument. The damping in permanent magnet moving coil instruments is provided by eddy current damping, the PMMC instruments are one type of spring-controlled instruments and the instruments are delicate, accurate, and sensitive. The permanent magnet moving coil instruments work on the DC motor principle, whereas the moving iron instruments work on the principle of magnetism. The deflection torque in PMMC instruments is proportional to the square of the current and the controlling torque is proportional to the angle of deflection. 1). Which one of the following moving coil instruments is used only for DC? PMMC Dynamometer Both a and b None of the above Hint 2). Which one of the following is a moving iron type meter? Repulsion Electrodynamic Permanent magnet type None of the above Hint 3). Which one of the following is a type of indicating instrument? X-Y plotters Watt-hour meter Wattmeters and ammeters All of the above Hint 4). Which one of the following instrument works on the principle of magnetism? Moving iron instruments Moving coil instruments Both a and b None of the above Hint 5). The deflection torque in moving coil instrument is proportional to _______________? Current Voltage Square of the current None of the above Hint 6). In which one of the following instruments the damping is provided by eddy current? Moving coil Moving iron Both a and b None of the above Hint 7). The cost of the moving coil is ___________________ compared to moving iron? High Very high Low Very low Hint 8). In which one of the following instruments the consumption of power is very low? Moving coil Moving iron Dynamometer None of the above Hint 9). In which one of the following instruments the torque weight is ratio is high? Moving coil Dynamometer Both a and b None of the above Hint 10). The instruments are categorized into ______________ types? One Two Three Four Hint 11). Which one of the following instruments is a spring-controlled instruments? Moving coil Moving iron Both a and b None of the above Hint 12). Which one of the following instruments is suitable for both dc as well as ac? Moving coil Dynamometer Moving iron Both b and c Hint 13). The accuracy and sensitivity are very poor in _________________ instrument? Add description here! Moving coil Dynamometer Both a and b None of the above Hint 14). In which one of the following instruments the conductor coil is used? Moving coil Moving iron Both a and b None of the above Hint 15). Which one of the following meters is used to measure the current? Ammeter Voltmeter Both a and b None of the above Hint 16). Which one of the following meters have the high resistance? Ammeter Voltmeter Both a and b None of the above Hint 17). The changing of the range is possible in ____________ meter? Ammeter Voltmeter Both a and b None of the above Hint 18). The resistance must be _____________ for an ideal voltmeter device? Zero Infinity One Finite Hint 19). Which one of the following is a low resistance instrument? Ammeter Voltmeter Both a and b None of the above Hint 20). Which one of the following instruments is a type of secondary instrument? Recording Integrating Indicating All of the above Hint 21). Which one of the following meters always connected in parallel? Ammeter Voltmeter Both a and b None of the above Hint 22). Which one of the following meters can work with or without magnetic field? Ammeter Galvanometer Both a and b None of the above Hint 23). Which one of the following instruments displays the results in the form of binary bits? Analog instrument Digital instrument Both a and b None of the above Hint 24). In which one of the following instruments the impedance is low? Analog instrument Digital instrument Both a and b None of the above Hint 25). The air friction damping occurs in _____________ devices? Moving coil Moving iron Both a and b None of the above Hint PMMC Instrument Important MCQs 26). In which one of the following instruments the scale is uniform? Moving coil Moving iron Both a and b None of the above Hint 27). How many types of ammeters are there? One Two Three Four Hint 28). Which one of the following meters measures the current? Ohmmeter Ammeter Both a and b None of the above Hint 29). Which one of the following ohmmeters measures a large amount of resistance? Micro-ohmmeter Milli-ohmmeter Megohmmeter None of the above Hint 30). Which one of the following is an example for absolute instrument? Tangent Ampere-Hour meters Wattmeter All of the above Hint 31). The figure shown below is a block diagram of ____________ loud-speaker? Moving iron Moving coil Galvanometer Hint 32). The electro dynameter instruments are categorized into _____________ types? One Two Three Four Hint 33). ___________ damping occurs in electro dynameter instruments? Air friction Eddy current Both a and b None of the above Hint 34). In under damped condition the response is _____________? Sluggish Oscillatory Both a and b None of the above Hint 35). The Rayleigh current balance is an example for _____________ instrument? Absolute Secondary Both a and b None of the above Hint 36). In which instruments the information is in direct pulses? Analog instruments Digital instruments Both a and b None of the above Hint 37). Which one of the following is used to measure coupling? Torque Moment Both a and b None of the above Hint 38). The Nm/resolution is an System Unit (SI) unit of ____________ ? Torque Moment Both a and b None of the above Hint 39). Which one of the following is a movement related force? Torque Moment Both a and b None of the above Hint 40). Which one of the following is an example for secondary instrument? Tangent Wattmeter Galvanometer All of the above Hint 41). Which one of the following instruments is a gravity-controlled instruments? Moving coil Moving iron Both a and b None of the above Hint 42). Which one of the following errors occurs due to carelessness of human while recording, reading, and calculating the results? Gross errors Observation errors Both a and b None of the above Hint 43). The float-type petrol tank level indicator is an example for ___________ instrument? Active Passive Both a and b None of the above Hint 44). In which one of the following control the controlling torque is varied? Gravity control Spring control Both a and b None of the above Hint 45). In which one of the following types of control the levelling is not required? Moving iron Electrostatic PMMC instruments None of the above Hint 46). Which one of the following is an example for fluid friction damping? PMMC instruments Moving iron instruments Electrostatic instruments None of the above Hint 47). The moving iron and electrodynamometer are an example for ______________ damping? Air damping Fluid friction Eddy current None of the above Hint 48). Which one of the following is a type of absorption dynamometer? Belt transmission dynamometer Epicyclic dynamometer Rope brake dynamometer None of the above Hint 49). The transmission dynamometer is categorized into __________ types? One Two Three Four Hint 50). Which one of the following moving coil instruments is used only either ac or DC? PMMC Dynamometer Both a and b None of the above Hint PMMC Instrument MCQs for Quiz 51). The series field winding shunt is an example for ___________ resistance? Low Medium High Very high Hint 52). In which one of the following type ohmmeters the switch is required? Series Shunt Both a and b None of the above Hint 53). The figure shown below is a construction diagram of ____________ instrument? Moving iron Moving coil Galvanometer None of the above Hint 54). Which one of the following meters can be used to test transistors and diodes? Voltmeter Multi-meter Both a and b None of the above Hint 55). The porcelain insulator is an example for ___________ resistance? Low Medium High Very low Hint 56). Which one of the following meters is based on zero deflection method? Potentiometer Voltmeter Both a and b None of the above Hint 57). The switch is not required in ___________ type of ohmmeter? Series Shunt Both a and b None of the above Hint 58). The ohm scale is in the same direction with current scale in ___________ ohmmeter? Series Shunt Both a and b None of the above Hint 59). The multiplier resistance is an example for ___________ resistance? Low Medium High Very high Hint 60). Which one of the following is a type of recording instrument? X-Y plotters Watt-hour meter Wattmeters and ammeters All of the above Hint 61). The pressure measuring device is an example for ___________ instrument? Active Passive Both a and b None of the above Hint 62). The controlling torque can be obtained by controlling the __________ ? Spring Gravity Both a and b None of the above Hint 63). The method of damping is ______________ in the induction type instrument? Eddy current Air friction Air or eddy current None of the above Hint 64). The gravity spring is the method of control in ___________ type of instrument? Dynamometer Moving coil Thermocouple Electro static Hint 65). The control systems are categorized into _____________ types? One Two Three Four Hint 66). In which one of the following control the controlling torque is fixed? Gravity control Spring control Both a and b None of the above Hint 67). Which one of the following is a type of transmission dynamometer? Belt transmission dynamometer Rope brake dynamometer Epicyclic dynamometer Both a and c Hint 68). The absorption dynamometer is categorized into __________ types? One Two Three Four Hint 69). The ohm scale and current in series type ohmmeter is in __________ direction? Same direction Opposite direction Either in same or opposite None of the above Hint 70). Which one of the following is a type of integrating instrument? X-Y plotters Watt-hour meter Wattmeters and ammeters All of the above Hint 71). Which one of the following meters measures the resistance? Ohmmeter Ammeter Both a and b None of the above Hint 72). Which one of the following ohmmeters measures a low amount of resistance? Micro-ohmmeter Milli-ohmmeter Megohmmeter None of the above Hint 73). Which one of the following meters can’t be used to test transistors and diodes? Voltmeter Multi-meter Both a and b None of the above Hint 74). Which one of the following damping occurs in moving coil instruments? Air friction Eddy current Both a and b None of the above Hint 75). In over damped condition the response is _____________? Sluggish Oscillatory Both a and b None of the above Hint PMMC Instrument MCQs for Students 76). In which instruments the information is continuous? Analog instruments Digital instruments Both a and b None of the above Hint 77). Which one of the following is a static force? Torque Moment Both a and b None of the above Hint 78). The systematic error is categorized into ____________ types? One Two Three Four Hint 79). Which one of the following errors made by observes? Gross errors Observation errors Both a and b None of the above Hint 80). Which one of the following instrument works on the principle of DC motor? Moving iron instruments Moving coil instruments Both a and b None of the above Hint 81). Which one of the following is a high resistance instrument? Ammeter Voltmeter Both a and b None of the above Hint 82). Which one of the following meters always connected in series? Ammeter Voltmeter Both a and b None of the above Hint 83). Which one of the following meters require magnetic field? Ammeter Galvanometer Both a and b None of the above Hint 84). Which one of the following instruments displays the results in wave signal? Analog instrument Digital instrument Both a and b None of the above Hint 85). In which one of the following instruments the impedance is high? Analog instrument Digital instrument Both a and b None of the above Hint 86). The eddy current damping occurs in _____________ devices? Moving coil Moving iron Both a and b None of the above Hint 87). In which one of the following instruments the scale is non-uniform? Moving coil Moving iron Both a and b None of the above Hint 88). The ammeters are categorized into _____________ types? One Two Three Four Hint 89). The ohmmeters are categorized into _____________ types? One Two Three Four Hint Read more about Ohmmeter 90). The deflection torque in moving iron instrument is proportional to _______________? Current Square of the current Voltage None of the above Hint 91). The cost of the moving iron is ___________________ compared to moving coil? High Low Very high Either high or low Hint 92). In which one of the following instruments the consumption of power is high? Moving coil Moving iron Both a and b None of the above Hint 93). In which one of the following instruments the torque weight is ratio is small? Moving coil Dynamometer Both a and b None of the above Hint 94). In which one of the following instruments the accuracy and sensitivity is high? Moving coil Dynamometer Both a and b None of the above Hint 95). In which one of the following instruments the iron is used? Moving coil Moving iron Both a and b None of the above Hint 96). Which one of the following meters is used to measure the voltage? Ammeter Voltmeter Both a and b None of the above Hint 97). Which one of the following meters have the low resistance? Ammeter Voltmeter Both a and b None of the above Hint 98). The changing of the range is not possible in ____________ meter? Ammeter Voltmeter Both a and b None of the above Hint 99). The resistance must be _____________ for an ideal ammeter device? Zero Infinity One Finite Hint 100). In which one of the following instruments the damping is provided by air damping? Moving coil Moving iron Both a and b None of the above Hint Read more about PMMC Instrument For More MCQs Measurement and Instrumentation Please fill in the comment box below. Time is Up! Time's up
