Recent questions tagged universal

Description : What human gestures are universal?

Last Answer : The bird. That speaks in every language. Thumbs up also seems pretty universal.

Description : What is a Universal Blood Donor and a Universal Blood Recipient?

Last Answer : A universal blood donor is a person who is eligible to donate blood to any person in the world, except for a few set of people. The universal blood donor must have O- (O negative) blood group in ... type, even O-. So, the donor as well as recipient must be careful while involving in this process.

Description : State working principle of universal motor with the help of diagram.

Last Answer : Working Principle of Universal motor : It is modified DC series motor which can work on AC as well as DC supply. According to basic motor principle, whenever a current carrying conductor is placed in magnetic ... They have nearly same operating characteristic for both AC and DC supply. 

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 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 : A universal RLC bridge uses?

Last Answer : A universal RLC bridge uses Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance.

Last Answer : The speed of a universal motor is usually reduced by using gearing.

Last Answer : Speed control of a universal motor is achieved by varying field flux with tapped field windings, connecting rheostat in series, applying variable voltage by means of silicon controlled rectifier, applying variable voltage by means of variable auto-transformer.

Last Answer : A universal motor is one which can be operated either on D.C. or A.C. supply at approximately the same speed and output.

Last Answer : In a universal motor, the most common cause of brush sparking is open armature winding, shorted armature winding, shorted field winding, high commutator mica.

Last Answer : The speed/load characteristics of a universal motor is same as that of D.C. series motor.

Last Answer : The speed control of universal motor used for sewing machines is by varying the resistance.

Last Answer : The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.

Last Answer : The speed of a universal motor is generally reduced by using gear trains.

Last Answer : A universal motor can run on either A.C. or D.C.