Question Bank (I- scheme)
Unit Test I
Course: Electrical Estimating & Contracting
Code: (22627) Abbreviation - EEC
Semester: 6I Program: EE
UNIT I: ELECTRICAL WIRING DIAGRAMS (10 M)
2 Marks Questions:
1) Draw the symbol for i. Isolator ii. Lightning Arrester.
2) State any four I.E rules for electrical installation.
3) State IE rule 90.
4) State the different methods of representation of wiring diagram.
4 Marks Questions:
5) Draw the wiring diagram and single line diagram for control of two lamps and one fan
by individual switches.
6) Draw wiring diagram, schematic diagram and one line diagram to represent control of
one lamp and one plug (3 pin socket) on one board and one bell from another board,
each having its own switch.
7) Draw the following wiring diagrams: (i) One Lamp controlled by one switch. (ii) One
Lamp controlled by two switches.
UNIT II: DOMESTIC & COMMERCIAL INSTALLATIONS (16M)
2 Marks Questions:
8) Give any four example of commercial installation.
9) Explain the use of civil engineering building drawing in electrical installation systems.
10) Define service connection. State different type of service connection.
4 Marks Questions:
11) A newly constructed residential unit is having following load. (i) 8 Lamps of 40W (ii) 4
ceiling fan of 65W (iii) 4 Sockets of 6 Amp having 100 watt. (iv) 2 Sockets of 16 Amp
having 2 KW. Calculate: i. Total lighting load ii. Total power load iii. Size of
distribution board iv. Number of sub-circuit.
12) Describe the procedure to prepare a design for commercial electrical installation.
13) Draw wiring diagram for the residential load shown in Fig. No. 1
Fig.No.1
14) An Auditorium whose dimensions are 15m × 8m is to be fitted with an electric
installation. Estimate the quantity of material. Assume the height of ceiling to be 3m.
The wiring is running at a height of 1.5m from the floor.
The load in the hall is 12 fluorescent lamps (36 W each), 6 fans (80 W each) and 8 (5
Amp) Sockets and 2 (15 Amp) Socket outlets.
15) Prepare schedule of material required for underground service connection.
16) State stepwise design procedure for commercial installation.
17) Describe design of number of lighting sub-circuits with example for residential
installations.
18) State any four IE rules used in residential wiring installation.
19) With relevant diagrams, describe the method of polarity testing using test lamp.
UNIT III: INDUSTRIAL INSTALLATIONS (16M)
2 Marks Questions:
20) Compare industrial and residential electrical installation. (Any 2 points).
21) List any two differences between non-industrial and industrial load.
4 Marks Questions:
22) Explain how rating of main switch, motor switch, DB and cable is decided in
Industrial Installation.
22) Draw wiring diagram and single line diagram of 3phase, 415V, 5HP Induction
motor installation.
23) Prepare schedule of material for Industrial load as shown in Figure No. 2.
24) Design electrical installation scheme (layout and wiring diagram) of small industrial unit
having 3 phase load of 30kW flour mill. Also, prepare the list of materials required.
25) A wiring is to be carried out in a small repair shop, having the plan as shown in figure. The
power load comprises of two 3 phase, 400V, 7.5 H P cage induction motors connected
with a star-delta starter.
1. Prepare a wiring plan and single line schematic diagram indicating different equipment
used.
2. Estimate the quantity of material along with its detailed specification.