Description : At a local bar, three friends, Mr. Green, Mr. Red and Mr. Blue, were having a drink. One man was wearing a red suit; one a green suit; and the other a blue suit. 'Have you noticed,' said ... looked at the other two and said, 'You're absolutely correct.' What color suit is each man wearing? -Riddles
Last Answer : Since none of the men are wearing the color of suit that corresponds to their names, and Mr. Red was replying to the man in the blue suit, it had to be Mr. Green to whom he replied. We then know ... wearing a blue suit. Therefore, Mr. Red is wearing a green suit and Mr. Blue is wearing a red suit.
Description : Essential element must be absolutely necessary for supporting (A) _____ and (B)_____
Last Answer : Essential element must be absolutely necessary for supporting (A) _____ and (B)_____
Description : In a variable speed induction motor derive V/f kept constant over a wide range of its frequency variation. The motor operates in the following mode : - a) Constant power mode b) Constant torque mode c) Constant slip mode d) Variable power and variable torque mode
Last Answer : In a variable speed induction motor derive V/f kept constant over a wide range of its frequency variation. The motor operates in the following mode : - Constant torque mode
Description : For very low speed and high power applications the best suited ac motor is:
Last Answer : For very low speed and high power applications the best suited ac motor is: synchronous motor
Description : State working principle and applications of servo motor.
Last Answer : Working Principle of Servo Motor: Basically servo motor is made up of DC motor, which is controlled by a potentiometer and some gears. Its angle of rotation is controlled by the duration of ... Packaging 6) Woodworking 7) Textiles 8) Printing 9) Robotics 10) Portable drilling 11)Process control
Description : applications of each: i) Universal motor ii) Stepper motor.
Last Answer : i) Applications of Universal motor: 1) portable drills 2) hair dryers 3) grinders 4) mixers 5) table-fans 6) blowers 7) polishers 8) Kitchen appliances ii) Applications of Stepper motor ... 7) robotics 8) CNC machine 9) Control systems 10) Biomedical applications 10) XY recorder 11) plotters
Description : State any two applications of brushless DC motor.
Last Answer : 1) Synthetic fibre drawing works. 2) Turn table drives in record players. 3) Spindle drives in hard disk circuits. 4) Computer peripheral equipments as plotters etc. 5) Gyroscope motors. 6) Biomedical machines as heart pumps.
Description : The most suitable motor for low power applications is a/an: (A) dc series motor (B) dc shunt motor (C) ac two-phase induction motor (D) ac series motor
Last Answer : The most suitable motor for low power applications is a/an: dc shunt motor
Description : How can I quickly and easily shut down all non-essential applications and processes in Windows 7 64bit?
Last Answer : in before delete system 32
Description : What are your most essential/useful mac applications.
Last Answer : Useful: Transmit (FTP/SFTP/S3 client), Transmission (Bittorrent client) and TextMate (Programmer-type text editor). Loved: Tweetie (Twitter client) and the first non- T word: Adium (multi-protocol instant ... I use the beta because it has a few extra feature I needed/wanted, IRC for instance).
Description : What are some essential applications to have for Ubuntu?
Last Answer : Here are som suggestions: http://lifehacker.com/software/ubuntu/hack-attack-top-10-ubuntu-apps-and-tweaks-195437.php http://diveintomark.org/archives/2006/06/26/essentials-2006
Description : Why a synchronous motor is a constant speed motor?
Last Answer : When load increase in synchronous motor the load angle δ also increases but speed remains constant. The further increase in load cause further increase in load angle. When load angle reaches ... out of synchronism. Hence the motor rotates at synchronous speed otherwise it comes out of synchronism.
Description : When the torque required by the machine is more than the torque supplied by the motor, the flywheel is (A) Accelerated (B) Retarded (C) Rotating with constant speed (D) Any of the above
Last Answer : (B) Retarded
Description : The synchronous speed for a 3 phase 6-pole induction motor is 1200 rpm. If the number of poles is now reduced to 4 with the frequency remaining constant, the rotor speed with a slip of 5% will be _________. (A) 1690 rpm (B) 1750 rpm (C) 1500 rpm (D) 1710 rpm
Last Answer : (D) 1710 rpm
Description : A hysteresis motor (A) is not a self-starting motor. (B) is a constant speed motor. (C) needs dc excitation. (D) can not be run in reverse speed.
Last Answer : (B) is a constant speed motor
Description : A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to (A) 0.75 p.u (B) 0.5 p.u (C) 0.25 p.u (D) 0.125 p.u
Last Answer : A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to 0.5 p.u
Description : Under constant load conditions, the speed of a d.c. motor is affected by?
Last Answer : Under constant load conditions, the speed of a d.c. motor is affected by field flux.
Description : The position of sample in Survey method is Options: A) Essential B) Partial C) Constant D) None of the above
Last Answer : A) Essential
Description : Can I use Arduino for custom motor control applications?
Last Answer : Yes, Arduino can be used for custom motor control applications by interfacing with various motor drivers and other components to create custom motor control applications, such as robotics or automation.
Description : DC Motor Applications in Industries
Last Answer : In spite of wide use of ac supply, dc machines have some advantages compared to ac motors and are used in industries for some applications. Some of the applications where dc motors employed ... , conveyers, heavy planers, for shears and punches, for intermittent high torque loads and air compressors
Description : What Are The Applications Of Electric Motor?
Last Answer : Electric motors applications are: industrial f, blowers and pumps, machine tools, household appliances, power tools, and disk drives, record players.
Description : Give applications of resistance start Induction run motor?
Last Answer : Fans, Lathe machines, blowers, refrigerator , separators, washing machine etc
Description : Write the applications of synchronous motor.
Last Answer : a. Used for power factor improvement in sub-stations and in industries. b. As synchronous condenser c. Used for constant speed applications
Description : What are the applications of synchronous motor?
Last Answer : a. These motors are used in powerhouses, in sub stations for the improvement of power factor by connecting it in parallel to the supply and it is run without load under over excitation of ... many induction motors are installed to improve the power factor. c. Used for constant mechanical loads.
Description : State how a DS processor is applicable for motor control applications.
Last Answer : Speed of the AC induction motor can be controlled by varying the input voltage to the motor. This can be achieved by using a DSP kit to produce variable voltage. Variable voltage is produced by ... signals from the DSP are given back to the power module which controls the speed of the motor.
Description : The most suitable servomotor for low power applications is (A) a dc series motor. (B) a dc shunt motor. (C) an ac two-phase induction motor. (D) an ac series motor.
Last Answer : (B) a dc shunt motor.
Description : State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.
Last Answer : Modifications are necessary in a dc series motor so that it operates satisfactorily on ac supply. The modifications are as follows: 1) AC series motor is built with a few field turns as ... and grinders 5) High speed vacuum cleaners 6) Sewing machines 7) Food processors 8) Drilling machine
Description : List applications of stepper motor.
Last Answer : Applications of Stepper Motor: 1) Computer controlled systems 2) Numerical control of machine tools 3) Tape drives 4) Floppy disc drives 5) Computer printers 6) X-Y plotters 7) ... ) Extruders 21) Engravers 22) Analytical and Medical instruments 23) Embroidery Machines 24) Packaging Machines
Description : State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders
Last Answer : Application Suitable Single Phase Motor Table Fan 1) Capacitor split phase motor 2) Capacitor start capacitor run motor Mixers and Grinders 1) Universal motor 2) A.C. Series motor
Description : Write two applications of D.C. series motor.
Last Answer : The applications of D.C. series motor: 1. Cranes 2. Hoists 3. Trolley and cars 4. Conveyors 5. For traction work i.e. electric locomotives 6. Elevator 7. Air compressor
Description : State any four applications of DC shunt motor.
Last Answer : Applications of DC shunt motor: 1) Lathe machines 2) drilling machines 3) milling machines 4) Printing machinery 5) Paper industry 6) centrifugal and reciprocating pumps 7) blowers 8)fans
Description : State two applications of 1) Shaded pole motor 2) Universal motor
Last Answer : (i)Applications of Shaded pole motor: 1. Small fans 2. Toy motors 3. Hair dryers 4. Ventilators 5. Electric clocks 6. Record players 7. Motorized valves 8. Gramophones 9. Photocopying ... 5. Portable Drilling Machines 6. Electric Shavers 7. Mechanical computing Machines 8. Machine Tools etc.
Description : Draw and explain working of universal motor. Give two applications of universal motor.
Last Answer : Figure of Universal motor: Operation of universal motor on A.C. and D.C. supply: *A universal motor works on either DC or single phase AC supply. When the universal motor is ... , regardless of AC or DC supply, universal motor works on the same principle that DC series motor works.
Description : State any four applications of 3 phase induction motor.
Last Answer : Applications of 3 Phase Induction Motor: 1) Lathes 2) Flour mills 3) Grinders 4) Centrifugal pumps 5) Drilling machines 6) Laundry washing machines 7) Wood working machines 8) Blowers 9 ... industries 38) For generators 39) Driving line shafts 40) For practical purposes in educational institutes.
Description : If field current is decreased in shunt dc motor, the speed of the motor (a) remains same. (b) increases. (c) decreases. (d) none of the above.
Last Answer : increases
Description : What will happen if the induction motor runs at synchronous speed ?
Last Answer : Since there is always slip present in rotor it cannot run at synchronous speed no current will be developed hence no torque will developed
Description : With the help of neat diagrams,explain the following methods of speed control in DC series motor. i) Field diverter method. ii) Armature diverter method.
Last Answer : (i) Field diverter method: - Resistance connected in parallel with field winding -By adjusting this resistance current can by diverted from field winding -Thus field current decreases and the speed can be ... decreased, the flux must increase and hence speed is decreased than the rated speed.
Description : A three phase induction motor is driving full -load torque which is independent of speed. If the line voltage drops to 90% of the rated value, % increase in motor copper losses (a) 23% (b) -18% (c) 123% (d) None of these
Last Answer : A three phase induction motor is driving full -load torque which is independent of speed. If the line voltage drops to 90% of the rated value, % increase in motor copper losses (a) 23% (b) -18% (c) 123% (d) None of these
Description : A large dc motor is required to control the speed of the blower from a 3 -phase ac source. The suitable ac to dc converter is, 3 -phase (a) Fully controlled bridge converter ( ... bridge converter with freewheeling diode (c) Half controlled bridge converter (d) Converter pair in sequence control
Last Answer : a fullu control
Description : A cumulative dc compound motor runs at 1500 rpm. on full load. If its series field is short-circuited, its speed (1) becomes zero (2) remains unchanged (3) increases (4) decreases
Last Answer : Increases. As it's cumulative compound motor, both series and shunt field both assist each other. If series field is short circuited, the overall field strength will decrease and atop of that ... speed is inversely proportional to field strength. So, the speed will increase overall.
Description : Armature shunting method of speed control of dc shunt motor is preferred over annature resistance method due to: (1) Better speed regulation (2) Less loss in external resistance (3) Simplicity in control circuit (4) Reduced cost of controller
Last Answer : Armature shunting method of speed control of dc shunt motor is preferred over annature resistance method due to: Better speed regulation.
Description : A 50 Hz, 3—phase induction motor has a full load speed of 1440 rpm. The number of poles of the motor is: (A)4 (8)6 (0)12 (D)8
Last Answer : Ans: A N= Ns (1-S) = NS –NS x S 1440 = Ns (1-S) Ns = 1440 / (1-S) Ns = (120 f/ p) = 120 x 50/p = 6000 p Ns will be closer to N i.e 1440 When P=2 ; Ns = 3000 rpm , not close to N When P=4 ; Ns = 1500 rpm , it is closer to N Therefore P =4 for N=1440
Last Answer : The speed of the rotating magnetic field in an induction motor is known as the synchronous speed.
Description : The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?
Last Answer : Ns equals f/pair pole 50/4 - 12.5
Description : State Hess’s law of constant heat summation.Give its two applications.
Last Answer : Ans. Hess's law states that enthalpy change for a reaction is same whether the reaction occurs in single step or several steps. OR If a reaction occurs in several steps then ,its standard enthalpy of ... the formation of the compound (ii) It is used to calculate Lattice enthalpy of an ionic solid.
Description : Which of the following are considered applications of ultrasonic testing? (A) Determination of elastic constant (B) Detection of defects in metal (C) Measurement of material thickness (D) None of the above
Last Answer : (B) Detection of defects in metal
Description : Non-choosy eaters, what’s one food you absolutely can’t get before?
Last Answer : Raisin cookies
Description : How did you cope when you lost absolutely everything in your life?
Last Answer : Stand up and say "I'm not done yet Motherfuckers!"
Description : What’s a “cringe” song you absolutely love?
Last Answer : Mr brightside
Description : When a recipe calls for you to peel potatos, do you absolutely have to, for the dish to taste good?
Last Answer : It depends on what you are making and your preferences. If you are frying them, peeling them is best. For mashed you don’t have to but I prefer to. For baked you don’t want to and I eat the skins as well. But if you don’t peel them, do scrub them clean.