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An instrument used to measure relative humidity is the

a.

Hygrometer

b.

Hydrometer

c.

Pyrometer

d.

Manometer

A platinum resistance thermometer records 3.0 W at 0°C and 8.0 W at 100°C. If it records 6.0W in a certain environment, the temperature of the medium is?

a.

60°C

b.

80°C

c.

50°C

d.

30°C

An a.c generator can be converted to a d.c generator by replacing the

a.

Commutator with an armature

b.

Armature with a commutator

c.

Commutator with slip rings

d.

Slip rings with a commutator

Plane waves passing through a narrow gap emerge as circular waves. This phenomenon is known as

a.

interference

b.

dispersion

c.

refraction

d.

diffraction

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