PSDC CT2

Question 1

Precast planks have the advantages of smooth soffit finish, no _________ and rapid
assembly at site

Answer 1

formwork

Question 2

Most precast concrete columns are_____________ conventionally.

Answer 2

Reinforced

Question 3

The usage of L-shapes and inverted tee beams allow lower overall____________ than resting floor
and roof units on top of rectangular beams

Answer 3

height

Question 4

The hollow-core floor slab, the voids are primarily a means of reducing______________ and reducing
concrete and steel quantities.

Answer 4

Weight

Question 5

Which of the following is NOT a specific advantage of precasting?

Answer 5

Reduction of creep
Better quality control
High cost of setting up the plant

Question 6

Double tees and single tees are commonly cast with a rough surface on top because:

Answer 6

Better bondage for concrete topping

Question 7

Which of the following is FALSE about precast concrete wall panels:

Answer 7

Panels with openings can be prestressed.

Question 8

Double-tee slab is highly functional because:

Answer 8

it meets structural requirements
it provides a flat useful surface
All of the options

Question 9

The in-situ topping up of concrete of precast planks may vary between _________

Answer 9

50 to 200 mm

Question 10

Joint may be accomplished by ____, bolting or post-tensioning, or by cast-in- place
concrete connections.

Answer 10

welding

Question 11

. Circular precast columns are commonly used in construction projects.

Answer 11

false

Question 12

Precast segments are suitable for composite construction and may be combined with castin-place concrete to act in composite action

Answer 12

TRUE

Question 13

Prestressed beams ________

Answer 13

should not be lifted upside down.

Question 14

It is not safe to stand directly _______ the tendons when one way stressing work is in
progress

Answer 14

Below

Question 15

A tower crane is chosen for erecting precast prestressed components_____

Answer 15

whenever the lift heights are extreme

Question 16

Which of the following is NOT the properties of connections between precast members:
Accommodate volume changes due to creep, shrinkage and temperature in the member, its
support and the connection assembly itself.

Answer 16

Transmit bearing, shear, moment, axial tension and axial compression as required by the
design.

Question 17

The sequence of precast prestressed concrete components’ erection procedure are
rigging

Answer 17

planning

Question 18

Temporary bracing is necessary to______precast members during the erection until final
connections can be made.

Answer 18

Support

Question 19

. The erection procedure should include plans to maintain the___________ end equilibrium of the
structure during construction as well as after the structure is completed.

Answer 19

stability

Question 20

Bearings are mostly used in prestressed concrete bridge construction to allow for the
rotations at the supports that will accompany _______of the loaded structure, in the case of
longer spans.

Answer 20

Deflection

Question 21

. For preparation during the_____________any turning or rotation of the precast concrete until
should be done while it is on the ground or truck.

Answer 21

erection

Question 22

The joints occur in buildings between precast concrete and cast-in-place concrete, or
between precast units, are usually caulked for_____________

Answer 22

watertightness

Question 23

. It is necessary to move a large precast member some distance with one or more crane, the
ground over which the cranes move must be very level and____________

Answer 23

firm.

Question 24

When hand signals are used during the erection of precast units, it must ensure that the
signals are standardized and understood by all

Answer 24

operators and riggers.

Question 25

The T-shaped or inverted L shaped beam which are subjected to eccentric loading. causes
structural instability during the assembly of structure.

Answer 25

FALSE

Question 26

During the rigging process, prestressed members can be lifted by their centre only. and they
cannot be lifted or stored upside down.

Answer 26

true