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Which motor is used in traction system?

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Description : The motor used for electric traction is  (1) D.C. shunt motor (3) D.C. series motor  (2) D.C. compound motor (4) Synchronous motor

Answer : The motor used for electric traction is D.C. series motor

Description : Why DC motor is used for traction?

Answer : An ideal traction system should have easy speed control, high starting tractive effort, equipment capable of with standing large temporary loads.

Description : What is the traction system?

Description : In quadrilateral speed-time curve of electric traction system, the accelerations during successive time periods are ______ respectively.  (A) positive, negative and negative (B) positive, zero and negative (C) positive, positive and negative (D) positive, negative and zero

Answer : In quadrilateral speed-time curve of electric traction system, the accelerations during successive time periods are positive, negative and negative respectively. 

Answer : The voltage used for suburban trains in D.C. system is usually 600 to 750 V.

Description : Which type of motor is used in lift?

Answer : Synchronous motor

Description : A differentiator is not usually used in control system, because it : - (A) reduces damping  (B) increases error  (C) reduces gain margin  (D) increases input noise

Answer : A differentiator is not usually used in control system, because it : - increases input noise

Answer : Commonly used instruments in power system measurement are induction.

Description : Which type of starter is used to start the DC motor?

Description : Which of the following test is usually conducted to determine the efficiency of traction motors ? (A) Field’s test (B) Swinburne’s test (C) Hopkinson’s test (D) Retardation test.

Answer : Which of the following test is usually conducted to determine the efficiency of traction motors ? (A) Field’s test (B) Swinburne’s test (C) Hopkinson’s test (D) Retardation test.

Description : State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. 

Answer : The insulating materials used in motor are as belows: 1. Cotton, 2. Silk, or paper, 3. Press board, 4. Resins 5. PVC 6. Cellulose-Fiber, 7. Enameled coating, etc  ... Over 180° Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc.

Answer : The electric motor used in portable drills is universal motor.

Answer : In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.

Description : The damping winding in synchronous motor is generally used to?

Answer : The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

Description : State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor 

Answer : Name the starters used for following motors : i) 3 H.P. 3-Ph squirrel cage I.M: i) DOL starter OR ii) Star-Delta Starter OR ii) Auto transformer starter OR iii) Soft start starter.  ii) D.C Shunt Motor : 1) Armature resistance starter (Three Point Starter) OR 2) Four Point Starter 

Answer : The type of D.C. motor used for shears and punches is cumulative compound D.C. motor.

Answer : The motor used for the compressors is capacitor-start capacitor-run motor.

Answer : The shaded pole motor is used for low starting torque.

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

Answer : The repulsion-start induction-run motor is used because of high starting torque.

Answer : The motor used on small lathes is usually single-phase capacitor run motor.

Answer : A shaded pole motor can be used for toys, hair dryers, circulators etc.

Answer : A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.

Description : In electric traction for a trapezoidal speed-time curve, the time period is (A) free running speed period = constant speed period (B) free running period = coasting period (C) free running period + coasting period = constant speed period (D) average speed period = scheduled speed period

Answer : In electric traction for a trapezoidal speed-time curve, the time period is free running period + coasting period = constant speed period

Answer : The D.C. motors preferred for traction applications beacuse the speed is inversely proportional to the torque and the torque is proportional to square of armature current.

Description : The range of frequencies used in induction heating is :  (A) 0-25 Hz  (C) less than 200 Hz  (B) 50 to 100 Hz  (D) more than 1 kHz

Answer : The range of frequencies used in induction heating is : more than 1 kHz

Description : The frequencies and voltage used in Dielectric heating are (A) 10 – 30 MHz, upto 25 kV (B) 50 – 60 Hz, upto 25 kV (C) 10 – 30 MHz, upto 100 V (D) 50 – 60 Hz, 110 V – 230 V

Answer : The frequencies and voltage used in Dielectric heating are 10 – 30 MHz, upto 25 kV

Description : Spot welding is used for (1) Thin metal (3) Castings only (2) Rough and irregular surface (4) Thick sections

Answer : Spot welding is used for Thin metal

Description : The electrode rod used for welding uses a coating on it 

Answer : The electrode rod used for welding uses a coating on it  to give a vapour to serve as a shielding gas to protect the weld area from atmospheric contamination and to provide slag to protect the welded area

Description : What is a conveyor motor?

Answer : Motors used to run conveyor belts.

Description : Draw and explain integrated duration curve used in system operation. 

Answer : Diagram of integrated duration curve used in system operation: Explanation:  Integrated duration curve is obtained from load duration curve. It is drawn in between load on Y-axis in KW/MW and the X- ... a particular time of a day can also be shown on a curve which is called as mass curve. 

Answer : The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc.

Description : Why radial distribution system used for short distance ? 

Answer : Because of following disadvantages radial distribution system is not used for long distance:  Since there is only one feeder to DTC feed at one point so, 1) There is no reliability ... more time for fault finding & repairing Hence radial distribution system is used for short distance.

Description : Explain how MEMS accelerometer is used as airbag sensor for car system.

Answer : MEMS Accelerometer is used as airbag sensor: Mechanical ignition airbags fit inside the steering wheel pad. When a collision occurs, the inertial sensor moves, setting off a ... the airbag with wiring. This is especially effective when fitting both driver- and passenger-side airbags.

Answer : Shunt motors,  Series motors, Compound motors

Description : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

Answer : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

Description : Why is a capacitor used in a single phase motor and not in three phase motor ?

Answer : In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.

Answer : A damping device prevents the oscillation of the moving system and enables the latter to reach its final position quickly.

Description : State at least one function and the material used for the following parts of DC Motor.

Answer : Part Function Material Yoke -Provides mechanical support for poles -Acts as protecting cover for machine -Provides path for magnetic flux Cast Iron OR Cast Steel Field Winding - ... Pole core  Provides mechanical support to field winding. Cast Iron OR Cast Steel

Answer : If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor.

Answer : Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be cumulatively compounded.

Answer : if induction motor rotates exceed than its synchronous speed, it acts as a generator.

Description : Which of the following elements are used as dopants in silicon or germanium semiconductors? A) Antimony B) Phosphorus C) Arsenic D) All the above

Answer : Which of the following elements are used as dopants in silicon or germanium semiconductors? A) Antimony B) Phosphorus C) Arsenic D) All the above

Answer :  Sandwich type winding is used in 3 phase shell-type transformer.

Description : Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna

Answer : Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna 

Description : Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Answer : Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Description : As per Electricity Act, ____________means any line which is used for carrying electricity for any purpose.  (A) Electric line (B) Transmission line (C) All of the above (D) None of the above

Answer : As per Electricity Act, Electric line means any line which is used for carrying electricity for any purpose. 

Description : Which circuit is used as amplitude comparator?

Answer : Schmitt trigger circuit is used as amplitude comparator.

Description : Which of the following gates can be used to realize all possible combinational logic functions?  (i) OR gate (ii) NOR gate (iii) Exclusive OR gate (iv) NAND gate (v) AND gate  (A) (iii), (iv) and (v)  (B) (i), (iii) and (iv)  (C) (ii) and (iv)  (D) (i) and (v)

Answer : Which of the following gates can be used to realize all possible combinational logic functions?  (i) OR gate (ii) NOR gate (iii) Exclusive OR gate (iv) NAND gate (v) AND gate  (A) (iii), (iv) and (v)  (B) (i), (iii) and (iv)  (C) (ii) and (iv)  (D) (i) and (v)

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