05
D:-286
Correct Answer:- Option-C
Question86:-In order to find plasticity retention index samples are aged
A:-For 30 minutes at 140°C
B:-For 48 hours at 100°C
C:-For 24 hours at 140°C
D:-For 42 minute at 100°C
Correct Answer:- Option-A

Question87:-Capacitance of a capacitor made only with two metallic sheets is
increased from 2 F to 5F when the gap between is filled with a polymer. Find the
dielectric constant of that polymer

A:-10

B:-2.5

C:-0.4

D:-7

Correct Answer:- Option-B
Question88:-Which among the following has highest iodine adsorption number

A:-HAF

B:-SAF

C:-ISAF

D:-GPF

Correct Answer:- Option-B

Question89:-Roll deflection is observed in calendars due to

(1) The force that pulls calenders rolls apart is higher in middle and less at ends
(11) Rolls tend to bend under its own weight

(111) Uniformly distributed normal force from the compound

A:- (i) and (ii)

B:-(i) only

C:-(ii) only

D:-(ii) and (iii)

Correct Answer:- Option-B

Question90:-In a three roll calender the ratio of speed of middle roll and bottom roll
is 1:1.5. This calender can be used for

A:-Frictioning
B:-Topping
C:-Spreading
D:-None of the above