Tachometer Question & Answers March 2, 2023 By Wat Electrical This article lists 75 Tachometer MCQs for engineering students. All the Tachometer 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 Tachometer. A tachometer is a device that is used for measuring the speed of a dynamic device/motor in RPM where RPM is Revolutions per minute. They are classified as analog and digital type. They operate on the relative motion principle. There are4 types of tachometers. They’re: Analog tachometers, Digital tachometers Contact and Non-contact tachometer, and Time and frequency measuring tachometer. Contact and Non-contact tachometer classified-based data acquisition. The advantages of a non-contact-based tachometer include accuracy, efficiency, and durability. A tachometer instrument is used to measure the revolution of the speed of a disk/shaft. These are normally used in different machines and motors which are available in the automotive and aviation industries. 1). Which of the following is the principle of Tachometer? Relative motion Regenerative energy Inertia All the above Hint 2). Which of the following are class of tachometers? Analog Digital Contact All the above Hint 3). Which are measured using Tachometer? Measuring speed of a shaft Measuring rotational speed Measure flow of liquid All the above Hint 4). Which tachometers is classified based data acquisition? Analog tachometer Centrifugal tachometer Contact or non-contact tachometer Time and frequency Hint Read more about SCADA. 5). Which tachometer is classified based on measurement technique? Analog tachometer Non-contact tachometer Contact tachometer Both b and c Hint 6). Which of the following are Data acquisition types? Contact type Non-contact Bi contact Both a and b Hint 7). What is the sensitivity value of tachometer? 4 V/1000 rpm 2 V/1000 rpm 3 V/1000 rpm 1 V/1000 rpm Hint 8). Tachometer measures ____ quantity? Frequency Time Velocity Speed of a shaft Hint 9). What is RPM? Revolutions per minute Revolutions per meter Revolutions per milli-meter All the above Hint 10). What are the applications of Tachometer? Automobiles Laser Analog audio recording All the above Hint 11). Which are digital Tachometer components? LCD LED Memory All the above Hint Read more about LED. 12). What is the purpose of tachometer sensors with tachometer detects? Motion Optical Laser All the above Hint 13). A digital type of tachometer is an optical type_____? Encoder Decoder Mux De-Mux Hint 14). A tachometer is available as ___ forms? Analog Digital Both a and b Counter Hint 15). Which tachometer should be joined with the rotating shaft? Contact type Non Contact type a and b Speed type Hint 16). Tachometer which has laser as a component is ____? Noncontact Contact Time measurement Shaft Hint 17). Which are the advantages of non-contact based tachometer? Accurate Durable Efficient All the above Hint 18). The speed of digital tachometer is? 1 to 99999 2 to 99999 1 to 10000 All the above Hint 19). Which type of beam is used in non-contact type tachometer? IR UV Visible Both a and b Hint 20). What is the measuring angle in laser type tachometer? 120 100 <120 >120 Hint Tachometer MCQs for Students 21). In which type, the tachometer calculates the speed by measuring the number of frequency of pulses? Contact type Noncontact type Time based Frequency based Hint 22). A frequency type tachometer depends on the speed of the rotating? Shaft Laser LCD All the above Hint 23). Up to how many digits does a laser type tachometer displays? 2 3 4 5 Hint 24). In which type, the tachometer is more accurate for the low speed measurements? Contact type Noncontact type Time based Frequency based Hint 25). In which type of tachometer speed is calibrated with respect to the timegap between the pulses? Contact type Noncontact type Time based Frequency based Hint 26). Which is the operational temp range of contact based digital tachometer? 0 to 40C -20 to +55C 10 to 20C 10 to 100C Hint 27). Which is the temp storage range of contact based digital tachometer? 0 to 40C -20 to +55C 10 to 20C 10 to 100C Hint 28). Which is rotating speed range of contact based digital tachometer? 0 to 40rpm -20 to +55rpm 10 to 20rpm 0.5 to 10000 rpm Hint 29). A contactless digital type tachometer has measuring speed of? 1 to 99999rpm 0 to 99999rpm 1 to 1000000 100 to 100000rpm Hint 30). What is the frequency range of frequency type tachometer? 1Hz to 12KHz 2KHz to 10KHz 1KHz to 100KHz 10Hz to 12Hz Hint 31). Which of the following are tachometer type generators? Analogue type Digital type Both a and b ADC converter Hint 32). Is it possible for a tachometer to be wrong? Because of an insufficient power Because of excess power Because of resistance All the above Hint 33). Which tachometers does cars have? Cosmetic tachometer Lazer tachometer Copper tachometer Iron tachometer Hint 32). In which type of tachometer, it will have needle and dial type of interface? Contact type Noncontact type Analog type Digital type Hint 33). Units of time period is? Seconds Hertz Frequency Ohms Hint 34). In which type of tachometer, it will does not have a memory storage? Contact type Noncontact type Analog type Digital type Hint 35). In which type of tachometer, it cannot compute averaging, deviation, etc? Contact type Noncontact type Analog type Digital type Hint 36). In which type of tachometer, it can perform the statistical functions like averaging, deviation, etc? Contact type Noncontact type Analog type Digital type Hint 37). What is the use of Stroboscope? To measure frequency To measure angular speed To measure time All the above Hint 38). What is the advantage of stroboscope? It comes in contact with the rotating shaft It does not come in contact with the rotating shaft It leads to circuit breakdown All the above Hint 39). Frequency is measured in terms of? Hertz Farads Cycles Meters Hint 40). What is principle of Centrifugal tachometer? Centrifugal force increases speed of rotation decreases Centrifugal force is directly proportional to speed of rotation Centrifugal force is inversely proportional to time All the above Hint Tachometer MCQs for Interviews 41). Centrifugal tachometer range in rpm is? 4000 rpm 3000 rpm 2000 rpm 1000 rpm Hint 42). A 60 Watt bulb emits ____ lumen? 730 600 650 660 Hint 43). Which of the rays LED do not radiate? UV IR Visible All the above Hint 44). What is the representation of tacho? Speed Time Engine Velocity Hint 45). What is the representation of meter? Find Time Frequency Measure Hint 46). Which is the function of tachometer and speedometer? Measuring time Measuring frequency Measuring speed All the above Hint 47). Mechanical tachometer are based upon measuring the? Centrifugal Energy Centrifugal Force Both a and b All the above Hint 48). A centrifugal force is? Inertial force Fictitious force Pseudo force All the above Hint 49). The centrifugal force is applied in rotating devices such as? Centrifuges Centrifugal pumps Centrifugal governor All the above Hint 50). What is torque? Moment of motion Moment of inertia Moment of magnetic field Moment of force Hint Read more about Torque converter 51). How does tachometer measures torque? By rotational or linear field By irrotational or liner field By rotational or non-linear field All the above Hint 52). What is speed of RPM? Speed of rotation of machine Speed of non-linear field Speed of generator All the above Hint 53). Which of the following effect covers 2 same metal expansion? Seebeck Peltier Thompson All the above Hint 54). How many types of mechanical tachometer? 4 2 3 1 Hint 55). What is the accuracy of hand speed indicator tachometer? 3% 5% 1% 2% Hint 56). What is the rotational speed of a hand speed indicator tachometer? 1000 to 5000 5000 to 10000 20,000 to 30,000 Hint 57). What is present in the hand speed indicator tachometer? Stop watch Automatic disconnect counter a and b Dynamic watch Hint 58). What is the function of the automatic disconnect counter button in hand speed indicator tachometer? Depends on starting and reset button Depends on clutch Depends on time All the above Hint 59). What is use of spindle in hand speed indicator tachometer? It operates when it is connected to the clutch It operates when it’s connected to the shaft It operates when it’s connected to the stop watch It operates when it’s connected to reset button Hint 60). What happens if the start button is pressed in hand speed indicator tachometer? Watch will start Automatic clutch is engaged a and b Static timer Hint 61). What is the use of vibrating reed tachometer? In stop watch General monitoring To find inertia All the above Hint 62). What is the accuracy of hand speed indicator tachometer? +/- 0.3% +/- 0.5% +/- 0.1% +/- 0.2% Hint 63). What is speed range of vibrating reed tachometer? 200 to 102 rpm 400 to 103 rpm 600 to 104 rpm 800 to 105 rpm Hint 64). What are components in vibrating reed tachometer? Scale Actual frequency Tuned reeds All the above Hint 65). What are components of a hand speed indicator tachometer? Starting and reset button Dial Spindle All the above Hint 66). How the set of reeds arranged in vibrating reed tachometer? Vertically Horizontally Tangential All the above Hint 67). Which type of tachometers are not connected to shaft to measure the speed? Hand speed indicator tachometer Vibrating reed tachometer Slipping clutch tachometer Centrifugal tachometer Hint 68). What are the components are in slipping clutch tachometer? Input shaft Scale Dial Reset button Hint 69). What is speed of shaft in slipping clutch tachometer? It is indicated by the pointer which placed on the measuring shaft It is indicated by the pointer which placed on the indicator shaft It is indicated by the pointer which placed on the rotating shaft All the above Hint 70). Where is the spiral spring is connected in slipping clutch tachometer? Between slipping clutch and input shaft Between slipping clutch and inductor shaft Between spiral spring and inductor shaft Hint 71). Where is the friction material is placed in slipping clutch tachometer? Between slipping clutch and input shaft Between slipping clutch and inductor shaft Between slipping clutch and spiral spring shaft Hint 72). What are the components of centrifugal tachometer? Ball Spring Driver All the above Hint 73). What are the types of electrical tachometer? Tacho-generators Eddy current Magnetic pickup All the above Hint Read more about Eddy currents 74). What is the accuracy of digital tachometer? +/- 1rpm to 999 rpm +/- 0.3 rpm to 999 rpm +/- 5rpm to 990 rpm Hint 75). Which of the following is A1 watt type white color LED radiation? 100 1000 200 300 Hint Time's up
