the frame of an induction motor is usually made of
In ... As the industry standard it is usually the best economic choice. (b) high over-load capacity (b) MOSFET and BJ... 1) The frame of an induction motor is usually made of, 2) The frequency of the induced emf in an induction motor is, 3) In an induction motor, rotor speed is always, 4) The efficiency of an induction motor is about, 5) In induction motor, greater the number of poles. Slip of induction motor is negative when___ Slip of induction motor is negative when___ Slip of induction motor is negative when___ rotor speed is more than synchronous speed of the field and is in the same direction. (a) Stator. (b) chrome vanadium steel 6) A 4-pole three-phase induction motor has a synchronous speed of 25 rev/s. (d) shaft output in watts. ... is the simplest type of Induction Motor and the most generally used. The stator of an induction motor is, in principle, the same as that of a synchronous motor or generator. The shaft of an induction motor is made of (a) stiff (b) flexible (c) hollow (d) any of the above Ans: a 4. Aluminium. (d) Squirrel cage rotor using round copper bars. 14. It is made of cast iron. C) Aluminium. 8.2.1.1 Stator of Three Phase Induction Motor The stator of the three phase induction motor consists of three main parts :. A. (d) induced e.m.f in the rotor increases and its frequency falls, (a) D.C. shunt motor Its main function is to support the stator core and the field winding. The AC motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field. The rotor of an induction motor can be a squirrel cage rotor or wound type rotor. The frame of an induction motor is usually made of. Bronze. (a) By using this method the speed can be easily controlled. It acts as a covering and it provide protection and mechanical strength to all the inner parts of the induction motor. The frame of an induction motor is usually made of (a) silicon steel (b) cast iron (c) aluminium (d) bronze Ans: b 3. Slip rings are usually made of a) Copper b) Carbon c) Phosphor bronze d) Aluminium. Squirrel cage. (c) needle bearing An induction motor consists essentially of two main parts : (a) a stator and (b) a rotor. Required fields are marked *. decreases and frequency increases Induction Motor MCQ #1. Atom 2. Mcq Added by: Hamza. Either A & B. The frame of an induction motor is usually made up of. The shaft of an induction motor is made of (a) stiff (b) flexible (c) hollow (d) any of the above Ans: a 4. (a) closed grained cast iron If you continue to use this site we will assume that you are happy with it. An induction motor can therefore be made without electrical connections to the rotor. A) Silicon steel. ills 1, 2, 3, and 4 show the basic parts of a three-phase, wound-rotor induction motor. The starting torque of a squirrel-cage induction motor is low negligible same as the full-load torque slightly more than full-load torque 3. 4. Capacitor start capacitor run motor The frame of an induction motor is * usually made of silicon steel cast iron bronze aluminium 3 phase 440 V, 50 Hz induction motor has 4% slip. The frame of an induction motor is usually made of (a) silicon steel (b) cast iron (c) aluminium (d) bronze Ans: b. (c) almost same B. 2. What is an Induction Motor? In fractional horsepower motors the frame sizes are two digits and represent the shaft height of the motor from the bottom of the base in sixteenths of an inch. (c) combined stator and rotor input in watts Induction motor drives with closed-loop control are used in similar applications to d.c. motor drives (i.e. (d) same as supply frequency, (a) high speed steel (b) To achieve a smooth starting torque. Construction of Three phase Induction motor 1.Frame: It is the outer body of the motor.The frame may be die cast or fabricated.The frames for medium and large machines are almost exclusively fabricated.Machines up to about 50 KW rating may have frame die cast in a strong silicon-aluminium alloy,sometimes with the stator core cast in. Induction motor is the motor which works on The intent is to standardize connecting arrangements for personnel installing the motor or reconnecting it after maintenance. (b) Low voltage • 1425 RPM 4 pole motor most common speed. The stator . The frame of an induction motor is usually made of . The stator is the outer stationary part of the motor, which consists of: The outer cylindrical frame of the motor, which is made either of welded sheet steel, cast iron or cast aluminum alloy. 15) A 4 pole 50 Hz induction motor is running at 1300 rpm. cast iron. (c) none of the above, (a) induced e.m.f. Bronze. Find the speed of stator magnetic field with respect to the rotor? Like any electric motor, a 3-phase induction motor has a stator and rotor. 20) What happens if fifth harmonics is given to induction motor? © www.yourelectricalguide.com/ induction motor questions. (d) To attain a higher maximum torque. Almost 80% of the motor is a three-phase induction motor among all motors used in industries. (a) very small (b) large number of narrow slots 1) The frame of an induction motor is usually made of. (d) Bush bearing, (a) open slots with tapered teeth It is made up of a number of stampings, which are slotted to receive the windings [Fig.34.2 (a)]. ( aluminum. What is the Three Phase induction motor Working Principle? A. silicon steel B. cast iron C. aluminium D. bronze. Ravi Kansagara January 26, 2018. The frame of three phase induction motor should be strong and rigid as the air gap length of three phase induction motor is very small. (a) turned OFF but not turned ON with the gate... 1) IGBT is a modern power semiconductor device, that combine the characteristics of (a) SCR and MOSFET. B) Motor will rotate in reverse direction, C) Motor will rotate in the same direction, (11)-A | (12)-C | (13)-C | (14)-B | (15)-B | (16)-D | (17)-C | (18)-C | (19)-D | (20)-B |, Post Comments To connect a motor in either star or delta configuration, winding ends are bridged (see Figure 8). The rotor is separated from the stator by a small air-gap which ranges from 0.4 mm to 4 mm, depending on the power of the motor. The shaft of an induction motor is made of (a) high speed steel (b) stainless steel (c) carbon steel (d) cast iron Ans: c 5. Your email address will not be published. (c) same as slip frequency An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. The shaft of an induction motor is made of (a) high speed steel (b) stainless steel (c) cast iron 16) The condition for maximum starting torque is, 17) Blocked rotor test in an induction motor is used to determine, 18) If an induction machine is run at above the synchronous speed it acts as, 19) Induction motors have the advantage of. A three-phase Induction motor mainly consists of two parts called the Stator and the Rotor. 1. The frame of induction motor is usually made of___ silicon steel. (c) With reductions in torque the speed decreases considerably. (a) Die cast aluminum rotor. The frame is either made … (d) none of the above, (a) large number of semi-open slots The magnetic path, which comprises a set of slotted steel laminations pressed into the cylindrical space inside the outer frame. 80. Lamination is necessary since a voltage is induced along the axial length of the steel as well as in the stator conductors. (b) 60 Hz (c) leading power factor Although no direct inch measurement relates to it, the third digit of three-digit frame sizes is an indication of the motor body's length. (b) to get poor power factor Figure 8 Bridging connections in a three-phase induction motor terminal block (b) Wound rotor. Just divide the first two digits by four. The frame of an induction motor is usually made of . c. aluminium d. bronze. B. • 950 RPM 6 pole motor 3rd most common speed. The stator is made up of laminations with a large hole in the center in which the rotor can turn; there are slots in the stator in which the windings for the coils are inserted. (b) closed slots with parallel teeth Squirrel-cage induction motor Slip-ring induction motor The shaft of an induction motor is made of (a) stiff (b) flexible (c) hollow (d) any of the above Ans: a. The laminations are insulated from each other usually by a varnish layer. Induction Motor MCQ #1 1) The frame of an induction motor is usually made of A) Silicon steel B) Cast iron C) Aluminium ... Power system MCQ #5 ... Slip ring of an induction motor is usually made … (c) small number of narrow slots in stator (b) Motor keeps on running but draws more current. (b) less break down torque aluminum. Block rotor test only. Correct! Login . On larger 3-digit frame size motors, 143T through 449T, a slightly different system is used where the first two digits represent the shaft height in quarters of an inch. An induction motor, 3 phase induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. 3. Thus, a 405 frame (original, U frame, or T frame) has a shaft height of 40 divided by 4, or 10 in. rotor. The stator is built up of high-grade alloy steel laminations to reduce eddy current losses. (c) induced em.f. An induction motor consists essentially of two main parts : (a) a stator and (b) a rotor. bronze. Construction of Induction Motor The AC induction motor comprises two electromagnetic ... usually made from laminated silicon steel, to carry magnetic flux 2. (c) as a return path for the flux Slip rings are usually made of a) Copper b) Carbon c) Phosphor bronze d) Aluminium. (b) High slip The stator consists of a steel frame that encloses a hollow, cylindrical core made up of thin laminations of silicon steel to reduce hysteresis and eddy current losses. In the induction motor, the frame is usually made of (a) silicon steel (b) cast iron (c) aluminum (d) bronze; Ans: b. The Induction motor is also known as asynchronous motor because its rotor rotates at a speed less than the theoretical synchronous speed of the motor. (c) Overload (d) None of the above. (b) rotor input in watts The frame of an induction motor is usually made of_____? you can comment or message me if you have any doubt. (d) High frequency. It is the outer most part of the three phase induction motor. (c) to get good power factor B. A three phase induction motor is a type of AC induction motors which operates on three phase supply as compared to the single phase induction motor where single phase supply is needed to operate it. A double squirrel-cage induction motor has two rotors moving in opposite direction two parallel windings in the stator two parallel windings in the rotor two series windings in the stator 2. Starting winding will overheat. (d) external voltage is to be fed into rotor, (a) Skewed slots carbon (a) closed grained cast iron (b) aluminium (c) stainless steel bronze. (b) cost is the main consideration (b) bush bearing An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. Bronze. Capacitor start capacitor run motor The frame of an induction motor is * usually made of silicon steel cast iron bronze aluminium 3 phase 440 V, 50 Hz induction motor has 4% slip. Cast iron. The frame of the induction motor is made either of welded sheet steel … Electric motor - Electric motor - Construction of induction motors: The stator frame consists of laminations of silicon steel, usually with a thickness of about 0.5 millimetre. Typical rotor speeds for squirrel cage induction motors are: • 2850 RPM 2 pole motor 2nd most common speed. This may include feet or a flange for mounting. • A magnetic circuit, usually made from laminated silicon steel, to carry magnetic flux . (c) either of the above A magnetic circuit, usually made from laminated steel, to carry magnetic flux; The stator. An induction motor's rotor can be either wound type or squirrel-cage type. 4. The intent is to standardize connecting arrangements for personnel installing the motor or reconnecting it after maintenance. Silicon steel. Silicon steel b. cast iron. A. Motor stops quickly. In the induction motor, the shaft is made of (a) stiff (b) flexible (c) hollow (d) any of the above; Ans: a. ⇒ The frame of an induction motor is made of carbon closed grained cast iron aluminium stainless steel ⇒ The term `cogging` is associated with three phase transformers compound generators D.C. series motors induction motors ⇒ For which motor the speed can be controlled from rotor side ? To connect a motor in either star or delta configuration, winding ends are bridged (see Figure 8). A. silicon steel B. cast iron C. aluminium D. bronze. (a) to protect the whole machine (d) ball bearing, (a) zero (a) Stator The stator of an induction motor is, in principle, the same as that of a synchronous motor or generator.