Jaypee Institute of Information Technology (JIIT) 2008 M.Tech Civil Engineering test 3: mechanical & electrical systems in buildings - Question Paper
JAYPEE I MVERSITY OF INFORMATION TECHNOLOGY, WaKNAGHVT
TEST-3
M.Tccb. (CTM) 1 semester. 2008
COURSE CODE: 07M1U K105 MAX. TIME I hr. 30 mint.
COURSE NAME: Mechanical and Elcclrical Svstems la Buildings
COURSE CREDITS 03__MAX. MARKS 30_
Mote: AH questions arc compulsory. Marks are indicated against questions._
Q I. (a) Deduce the emf equation ofa transformer. (2)
(b) A single-phase, 250-kVA, U-kV'415-V. SO-Hz transformer has 80 turns on the secondary. Calculate (/) the approximate values of the primary and secondary currents. (> the approximate number of pnmary turns, and (in') the maximum value of the flux.
(1 + 1 + 1 - 3)
Q.2. (a) Draw a typical torque-slip characteristic curve of on induction motor. (2)
(b) A 3-phase. 6-pole, 50-Hz induction motor has a slip of I % at no load and 3 % at full load. Find <0 the synchronous speed, (iff the no-load speed. (iii) the full-load spcod. (1 + 1 +1-3)
Q.3. (a) Explain with diagrams (he following: (a) one-pipe heating system and 4b) uvo-pipe heating system (3)
(b) Describe the requirements of gas-supply system in a residential building (2)
Q.4. (a) Write a note on communication installations in a building. (2)
(b) What is rolling sphere theory of lightning? Explain the conventional methods of lightning protection of buildings. (3)
Q.5. Under v.hat circumstances pump is necessary? Explain working of airlift pump with neat skctch (4)
Q.6 Water is required to be pumped from a well for a colony having population of 10000 Following data arc made available. (6)
Rate of water supply 150 litres/cap'day RL of full supply level of reservoir * 125 m
Maximum rate - 2 times the avg Length of rising main - 1000 m
Hours of pumping-16 RL of pump 107 m
Rl. of bottom of well a 100 m Minor losses 3 10%
Rl. of foot valve 101 m Friction factor - 0 03
RLof Low water level - 102 m Efficiency of pump sets - 70%
RL of ground level 106 m Velocity of water al discharge end * I m/s
Rl of maximum water level 104 m
Find the hotse power of the motor and running oosl per month if energy charges art Rs 2 5 per unit.
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