All Free Electrical Engineering MCQs with Answers
Every Electrical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
3,143 questions · page 30 of 158
- A. 1 to 4 kgf/cm2
- B. 5 to 8 kgf/cm2
- C. 10 to 15 kgf/cm2
- D. 25 to 35 kgf/cm2
Explanation: Conventional steam locomotives commonly operate with boiler steam pressures in the approximate range of 10 to 15 kgf/cm².
Correct answer: 10 to 15 kgf/cm2- A. Steam engine
- B. Diesel engine
- C. Battery locomotive
- D. Any of the above
Explanation: A battery locomotive avoids combustion and hot exhaust gases, so it does not provide an ignition source for explosive mine gases.
Correct answer: Battery locomotive- A. Jamalpur
- B. Bangalore
- C. Chittranjan
- D. Gorakhpur
Explanation: Chittaranjan Locomotive Works in West Bengal has historically been a major Indian manufacturer of electric locomotives.
Correct answer: Chittranjan- A. 20 to 25 percent
- B. 30 to 40 percent
- C. 45 to 55 percent
- D. 60 to 70 percent
Explanation: The overall efficiency of a diesel locomotive, including the diesel engine and transmission losses, is typically around 20 to 25 percent.
Correct answer: 20 to 25 percent- A. reduce friction
- B. increase friction
- C. facilitate braking
- D. facilitate in taking turns
Explanation: Tapered railway wheels help the wheelset develop different effective rolling radii on the two rails while negotiating a curve.
Correct answer: facilitate in taking turns- A. overhead wire
- B. battery system
- C. small turbo-generator
- D. diesel engine generator
Explanation: A steam locomotive can drive a small turbo-generator using steam from the boiler.
Correct answer: small turbo-generator- A. 50 to 200
- B. 500 to 1000
- C. 1500 to 2500
- D. 3000 to 5000
Explanation: Diesel-electric locomotives commonly fall in the approximate 1,500 to 2,500 horsepower range.
Correct answer: 1500 to 2500- A. electric locomotives
- B. diesel engine locomotives
- C. steam engine locomotives
- D. diesel electric locomotives
- E. all of the above
Explanation: Indian railway traction has historically included steam, diesel, diesel-electric, and electric locomotives.
Correct answer: all of the above- A. up to 1500
- B. 1500 to 2000
- C. 2000 to 3000
- D. 3000 to 4000
Explanation: Steam locomotives generally had lower power ratings than modern diesel or electric locomotives, commonly reaching up to about 1,500…
Correct answer: up to 1500- A. flywheel
- B. gear box
- C. applying brakes 11.
- D. regulating steam flow to engine
Explanation: In a steam locomotive, engine speed and tractive effort are primarily controlled by regulating the steam admitted to the cylinders.
Correct answer: regulating steam flow to engine- A. Electric
- B. Diesel
- C. Steam
Explanation: Electric locomotives usually have the highest operational availability because they have fewer moving parts and do not require onboard…
Correct answer: Electric- A. 5 to 10 percent
- B. 15 to 20 percent
- C. 25 to 35 percent
- D. 35 to 45 percent
Explanation: Steam locomotives lose much energy in the boiler, steam cycle, and mechanical transmission, so their overall efficiency is typically only…
Correct answer: 5 to 10 percent- A. universal motor
- B. single phase induction motor
- C. two phase induction motor
- D. three phase induction motor
Explanation: An AC servomotor is commonly constructed as a two-phase induction motor, with one winding used for excitation and the other for control.
Correct answer: two phase induction motor- A. Constant current
- B. Constant voltage
- C. Constant current as well as constant voltage
- D. Constant current, constant voltage and constant power
- E. None of the above
Explanation: An amplidyne is a high-gain rotating amplifier whose output can be arranged for constant-current, constant-voltage, or constant-power…
Correct answer: Constant current, constant voltage and constant power- A. two phase induction motor
- B. Three phase induction motor
- C. direct current series motor
- D. universal motor
Explanation: An AC servomotor is essentially a specially designed two-phase induction motor with separate reference and control windings.
Correct answer: two phase induction motor- A. minimum
- B. maximum
- C. nil
- D. none of the above
Explanation: Cold-rolled grain-oriented steel is processed so its magnetic domains align readily along the rolling direction.
Correct answer: maximum- A. single layered
- B. double layered
- C. multi-layered
- D. none of the above
Explanation: Cylindrical transformer windings made with circular conductors are built from several turns arranged in successive layers, so they are…
Correct answer: multi-layered- A. upto 20 kV
- B. upto 50 kV
- C. upto 80 kV
- D. for 110 kV and above
Explanation: Multi-layer helical windings are used for high-voltage transformer windings at very high voltage ratings, commonly 110 kV and above.
Correct answer: for 110 kV and above- A. distribution transformers
- B. power transformers
- C. shell type transformers
- D. none of the above
Explanation: Helical windings are suited to the high-current, relatively low-voltage windings commonly found in power transformers.
Correct answer: power transformers- A. short capacity transformers
- B. medium capacity transformers
- C. high capacity transformers
- D. any of the above
Explanation: Disc windings use short, heavily insulated rectangular conductors and provide good mechanical strength and cooling, making them suitable…
Correct answer: high capacity transformers