Recent questions and answers in Utilization of electrical energy

2 answers 71 views

Which of the following vapour/gas will give yellow colour in a filament lamp?   (a) Helium (b) Mercury (c) Magnesium (d) Sodium

answered 11 hours ago in Utilization of electrical energy
1 answer 29 views
1 answer 25 views

In practice generative breaking is used when (a) quick motor reversal is desired. (b) load has overhauling characteristic (c) controlling elevators, rolling mills etc. (d) none of these 

answered Sep 1, 2018 in Utilization of electrical energy
1 answer 33 views
1 answer 99 views
1 answer 42 views
1 answer 30 views

Which of the following lamp light output is comparable with that of day light?  (a) Fluorescent lamp (b) Sodium vapour lamp (c) Mercury vapour lamp (d) Halogen lamp 

answered Aug 14, 2018 in Utilization of electrical energy
1 answer 13 views

 Which braking system on the locomotives is the costliest among the following? A) Vacuum braking on diesel locomotives B) Vacuum braking on steam locomotives C) Regenerative braking on electric locomotives D) All braking systems are equally costly

answered Jun 17, 2018 in Utilization of electrical energy
1 answer 13 views

 lumen / watt is the unit of: A) light flux B) luminous intensity C) brightness D) luminous efficiency

answered Jun 17, 2018 in Utilization of electrical energy
0 answers 14 views

For heating a magnetic material using induction heating, the hysteresis and eddy current losses are respectively proportional to (a) f and f 2 (b) f 2 and f (c) f and f (d) none of the above 

asked May 25, 2018 in Utilization of electrical energy
1 answer 126 views

Power-factor of industrial arc and induction furnace is:

answered May 22, 2018 in Utilization of electrical energy
1 answer 15 views

For induction heating, which of the following is abnormally high?  A)Voltage B) Current C) Frequency D) Phase angle

answered May 20, 2018 in Utilization of electrical energy
1 answer 11 views

Electric welding equipment works best at  A) Low voltage and low current B) Low Voltage and high current C) High voltage and low current D) High voltage and high current

answered May 20, 2018 in Utilization of electrical energy
1 answer 10 views

Dielectric heating is used for heating  A) Wood B)Aluminium C) Magnetic steel D) Copper

answered May 20, 2018 in Utilization of electrical energy
1 answer 8 views

Tractive effort acts  A) At 90° with respect to the rails measured in counter clockwise direction B) At 270° with respect to the rails measured in counter clockwise direction C) Tangential to the driving wheel D) For overcoming the effect of gravity only when a train is being hauled

answered May 20, 2018 in Electric Traction
1 answer 15 views

The commonly used gases in tungsten arc welding are 1.Hydrogen and oxygen 2.Hydrogen and organ 3.Hydrogen and helium 4.Helium and argon

answered May 17, 2018 in Utilization of electrical energy
1 answer 13 views

Water break test is used to

answered May 15, 2018 in Utilization of electrical energy
1 answer 12 views

In an electroplating solution anions are

answered May 15, 2018 in Utilization of electrical energy
1 answer 4 views

Gray iron is usually welded by   (a) Gas welding (b) TIG welding (c) MIG welding (d) Arc welding 

answered May 13, 2018 in Utilization of electrical energy
1 answer 9 views

In an electric press, mica is used   (a) As an insulator (b) As a device for power factor improvement (c) For dielectric heating (d) For induction heating 

answered May 13, 2018 in Utilization of electrical energy
1 answer 9 views

 The flicker effect of fluorescent lamps is more pronounced at   (a) Lower frequencies (b) Higher frequencies (c) Lower voltage (d) Higher voltages  

answered May 13, 2018 in Utilization of electrical energy
1 answer 14 views

Change in the frequency of supply does not affect the   (a) Dielectric heating (b) Electrical resistance heating (c) Induction heating (d) Microwave heating 

answered May 13, 2018 in Utilization of electrical energy
1 answer 21 views

 In HPSV lamps, traces of neon gas   (a) Helps in stabilizing the arc (b) Changes the colour of light (c) Prevents the vaporization of filament (d) Assists during starting to develop enough heat to vaporize sodium

answered May 13, 2018 in Utilization of electrical energy
1 answer 11 views

The coefficient of adhesion is  (a) Zero in traction systems (b) Low in case of AC traction high in DC traction (c) High in AC traction low in case of DC traction (d) Same on AC and DC traction systems

answered May 13, 2018 in Utilization of electrical energy
1 answer 21 views

The average speed of a train is independent of   (a) Duration of steps (b) Acceleration and braking retardation (c) Distance between stops (d) Running time

answered May 13, 2018 in Utilization of electrical energy
1 answer 17 views

In which of the following welding methods, the molten metal is poured for joining the metals ?   (a) Gas welding (b) Thermit welding (c) TIG welding (d) Arc welding 

answered May 13, 2018 in Utilization of electrical energy
1 answer 18 views
1 answer 16 views

Arc resistance  (1) increases with increase in arc current (2) decrease with increase in arc current (3) is independent of arc current (4) is independent of arc length

answered May 1, 2018 in Utilization of electrical energy
1 answer 945 views

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

answered May 1, 2018 in Utilization of electrical energy
1 answer 27 views

For arc welding current range is usually  (1) 10 to 15 A (2) 30 to 40 A (3) 50 to 100 A (4) 100 to 350 A

answered Apr 30, 2018 in Utilization of electrical energy
1 answer 24 views

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

answered Apr 30, 2018 in Utilization of electrical energy
1 answer 13 views

Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :  (A) Butt welding and Seam welding  (B) Hydrogen shielding and Projection welding  (C) Seam welding and Coated electrode welding  (D) Coated electrode welding and Hydrogen shielding

answered Apr 30, 2018 in Utilization of electrical energy
1 answer 22 views

Choose the correct order of electric discharge lamps in their increasing order of efficiencies (lumens/watt) :  (A) Sodium vapour lamp, Mercury vapour lamp, Neon lamp  (B) Neon lamp, Sodium vapour lamp, Mercury vapour lamp  (C) Neon lamp, Mercury vapour lamp, Sodium vapour lamp  (D) Mercury vapour lamp, Sodium vapour lamp, Neon lamp

answered Apr 30, 2018 in Utilization of electrical energy
1 answer 23 views
1 answer 140 views
1 answer 14 views
1 answer 10 views
1 answer 14 views

Which of the following is a cold cathode lamp ?  (A) Mercury vapour lamp (C) Incandescent lamp (B) Sodium vapour lamp (D) Neon lamp

answered Apr 29, 2018 in Utilization of electrical energy
1 answer 16 views

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

answered Apr 29, 2018 in Utilization of electrical energy
1 answer 10 views

Pantograph is (A) a device used to draw Speed-Time characteristics in traction. (B) used to supply a.c. to transformer in locomotive. (C) a part of the control devices in locomotives. (D) used in traction motors for better efficiency.

answered Apr 28, 2018 in Utilization of electrical energy
1 answer 32 views

Trapezoidal speed-time curve is (A) an exact representation of the conditions in Main-line traction service. (B) an exact representation of the conditions in Suburban traction service. (C) a close approximation of the conditions in Suburban traction service. (D) a close approximation of the conditions in Mainline traction service.

answered Apr 28, 2018 in Utilization of electrical energy
1 answer 26 views

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

answered Apr 28, 2018 in Utilization of electrical energy
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