56.

57.

58.

59.

60.

61.

62.

63.

64.

The process of joining metals using copper, zinc & tin alloy as filler material in which the
base metal is heated above 420°C but below 850°C is called

(4) Soldering (B) Soft soldering
(C) Brazing (D) Both (A) & (B)

Copper is the preferred material for soldering bit because
(A) It is easy to maintain in serviceable condition
(B) Molten tin lead alloy easily adhere to it
(0) Itisa very good conductor of heat
(D) All of the above

The normal capacity of storing acetylene in dissolved state is 6 m* with the pressure ranging
between

(^) 120 - 150 kg/cm? (B) 120 - 160 kg/cm?
(C) 15 - 16 kg/cm? (D) 15 - 20 kg/cm?

This inorganic flux are known as killed spirits. It is mainly used for soldering copper, brass
and tin sheets.

(A) Hydrochloric acid ൯) 7170 chloride

(C) Ammonium chloride (D) Phosphoric acid
Soft solder is the filler metals used in soldering have a melting point below

(A) 427 Degree Celcious (B) 327 Degree Celcious

(C) 723 Degree Celcious (D) 983 Degree Celcious

In partially ventilated single stack system, the traps of the water closets are separately
ventilated by a separate vent pipe called

(^) Antisiphone pipe ൯ Relief vent pipe

(C) Stack (D) Building drain vent
The straightness of the drain pipe can be tested by

(^) Ball test (B) Smoke test

(C) Air test (D) Mirror test

The equipment required to conduct this test is drain plug/air bag stopper extrusion tubes,
funnel and sight gauge

(A) Smoke test (B) Chemical smell test
(C) Hydrostatic test (D) Pneumatic test

Septic tank is provided for
(ಹ) Settle sludge digestion (B) Setting of incoming sewage
(C) Storage of digested sledge (D) Allof the above

094/2022 10 A