B.TECH - Semester 8 electric power utilisation and electrical safety Question Paper 2019 (nov)
Practice authentic previous year university questions for better exam preparation.
- (a) With neat diagram explain the main equipments of refrigeration system and its working.
- What are the main properties that a resistance heating element material should possess?
- State Faraday's laws of electrolysis.
- List the various types of electric arc welding.
- What are the different sections in the speed time curve for urban service?
- What are the essential electrical characteristics of traction motors?
- What are the factors affecting the specific energy consumption in electric traction?
- Define luminous flux.
- State Lambert's cosine law.
- What are the factors on which the severity of electrical shock depends?
- Explain primary and secondary electric shock. ( $\mathbf{1 0} \boldsymbol{\times} \mathbf{2} \boldsymbol{=} \mathbf{2 0}$ marks) P.T.O.
- (a) Explain the different factors to be considered while selecting a traction motor.
- (b) What are the different factors to be considered while designing street lighting, factory lighting and flood lighting schemes?
- (a) Explain the different types of resistance heating with neat figures.
- (b) A 20 kW single phase, 220 V resistance oven employs circular nickel chrome wire for its heating elements. If the wire temperature is not to exceed $1700^{\circ} \mathrm{C}$ and the temperature of the charge is to be $500^{\circ} \mathrm{C}$, calculate the length and size of the wire required. As...
- (a) Explain in detail the process of extraction and refining of metals.
- (b) Explain the principle of dielectric heating and its uses.
- (b) A train runs at an average speed of $50 \mathrm{~km} / \mathrm{hr}$ between stations situated 2.5 km apart. The train accelerates at 2 km per hour per second and retards at 3 km per hour per second. Find its maximum speed assuming a trapezoidal speed time curve. Calculate also the distance trave...
- (a) Explain how regenerative braking is obtained in AC traction motor.
- (b) A 400 tonne train travels down a gradient of 1 in 70 for 120 sec . during which period its speed is reduced from $80 \mathrm{~km} / \mathrm{hr}$ to $50 \mathrm{~km} / \mathrm{hr}$ by regenerative braking. Find the energy returned to lines if the tractive resistance is $5 \mathrm{~kg} /$ tonne an...
- (a) Briefly explain the different types of lighting schemes used.
- (b) A drawing hall 30 m by 13 m with a ceiling height of 5 m is to be provided with a general illumination of 120 lux. Taking a coefficient of utilization of 0.5 and depreciation factor of 1.4, determine the number of fluorescent tubes required, their spacing and total wattage. Take luminous efficie...
- Explain the ground grid design procedure.
- (a) Briefly explain the grounding of distribution systems.
- (b) What are the precautions to be taken for the safe usage of electricity in various conditions. (10)
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