120. PVC conduits can be buried on
A. lime
B. plaster
C. concrete
D. any of these.
121. PVC conduits can be joined by
A. solvent cement
B. welding
C. threading
D. all of these
122. The earthwire should not he thinner than a
A.aSW-G- wire
B. 16 SWG wire
C. 10 SWG wire
D. 8 SWG wire
123. Electric braking is preferred because
A. smooth
B. maintenance cost is less
C. energy is saved in regenerating braking
D. all of these
124. The various types of electric braking are
A. plugging
B. rheostatic braking
C. regenerative braking
D. all of these
125. Braking retardation on suburban trains is
A. 0.3 to 0.5 km-phps
B. 0.5 to 1 km-phps
C. 3 to 5 km-phps
D. 30 to 40 km-phps
126. The coefficient of adhesion is highest when the rails are
A. dry
B. oiled
C. wet with dew
D. dusty
Page 18 of 35