Heat which in form of infra-red waves, emitted in all directions at speed of light is
a) Conduction
b) Convection
c) Radiation
d) Expansion
Fire alarm work on the principle of:
NTS PST (2016/2017)
a) electric expansion
b) thermal expansion
c) electric contraction
d) reflection
e) refraction
Electrical fire alarm works on the principal of…………and its detection. PET----- 24/08/2019
a) contracting
b) heat transfer
c) expansion
d) convection
In bridges to overcome expansion there is use of
a) Rollers
b) Sliding joints
c) Both a and b
d) Allowance
