CHEMICAL ENGINEERING

Question: Young’s modulus of elasticity of a material is the slope of the initial linear portion of the stress-strain curve. It decreases ap-preciablyby
[A].

alloying additions

[B].

heat treatment

[C].

cold work

[D].

increasing temperature

Answer: Option B

Explanation:

No answer description available for this question.

Question: In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
[A].

t = 15 – 0.0065 h

[B].

t = 15 + 0.0065 h

[C].

t = 0.0035 h – 15

[D].

t = 15 – 0.0035 h

Answer: Option A

Explanation:

No answer description available for this question.

Question: Cold chiesel’s hammers are made of
[A].

high speed steel

[B].

high carbon steel

[C].

forged steel

[D].

mild steel

Answer: Option B

Explanation:

No answer description available for this question.

Question: Addition of __________ to steel does not help in improving its machinability.
[A].

sulphur

[B].

silicon

[C].

lead

[D].

phosphorous

Answer: Option B

Explanation:

No answer description available for this question.

Question: For hardening high alloy steel, it is to be heated slowly and uniformly to avoid
[A].

local hardening

[B].

scale formation

[C].

segregation

[D].

warpage

Answer: Option D

Explanation:

No answer description available for this question.

Question: Machinability of hard alloys and tool steels is improved by
[A].

spherodising

[B].

annealing

[C].

tempering

[D].

normalising

Answer: Option B

Explanation:

No answer description available for this question.

Question: Wrought iron does not have the
[A].

uniform strength in all directions.

[B].

ability to hold protective coating.

[C].

high ductility & corrosion resistance.

[D].

easily weldable characteristics.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.
[A].

0.8

[B].

7.8

[C].

200

[D].

10000

Answer: Option A

Explanation:

No answer description available for this question.

Question: Lead is poured into the joint between two __________ pipes.
[A].

mild steel

[B].

concrete

[C].

cast iron

[D].

asbestos cement

Answer: Option C

Explanation:

No answer description available for this question.

Question: On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.
[A].

frequency

[B].

amplitude

[C].

damping

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.