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MCQs 1: For welding aluminium alloys, the electrodes used are

Hard drawn copper Cadmium copper Chromium copper Tungsten copper
Answer Explanation

MCQs 2: Voltage required for butt welding is

2 to 8 V 8 to 15 V 15 to 22 V 22 to 30 V
Answer Explanation

MCQs 3: In inert gas metal arc welding,

Argon is used for welding thin materials and helium is used for welding thick materials Both argon and helium are used for welding thin materials Both argon and helium are used for welding thick materials Argon is used for welding thick materials and helium is used for welding thin materials
Answer Explanation

MCQs 4: Advantage of using electron beam welding is / are

Welds are clean Absence of porosity Distortion less All of these
Answer Explanation

MCQs 5: Non - consumable electrodes are made of

Carbon Graphite Either carbon or graphite Same material as the metal pieces to be welded
Answer Explanation

MCQs 6: An ac timer circuit is used to control the number of cycles for which the power may be supplied to the weld. In this, the time required for the voltage to fall by a given amount is

Directly proportional to the resistor Directly proportional to the capacity of the condenser Directly proportional to the inductor Only (a) and (b)
Answer Explanation

MCQs 7: In salt bath heating, the current are allowed to flow only through the

Only through the salt bath Only through the material being heated Through both (a) and (b) None of these
Answer Explanation

MCQs 8: In resistance furnaces, the temperature can be controlled by

Varying the applied voltage Bucking and boosting secondary voltage Changing the number of heating elements All of these
Answer Explanation

MCQs 9: A good heating element should have

High resistivity and low melting point Low resistivity and high melting point High resistivity and high melting point Low resistivity and low melting point
Answer Explanation

MCQs 10: Eureka is an alloy of

Nickel and chromium Nickel and copper Iron, chromium and aluminium Nickel, chromium and aluminium
Answer Explanation

MCQs 11: Which type of heating is used for sterilization?

High frequency eddy current heating Coreless type heating Core type heating Dielectric heating
Answer Explanation

MCQs 12: The dielectric strength of air gap is

2.11kV/cm 21.1kV/m 21.1kV/cm 2.11kV/m
Answer Explanation

MCQs 13: The temperature produced in indirect arc furnace is

More than in direct arc furnace Less than direct arc furnace Equal to direct arc furnace None of these
Answer Explanation

MCQs 14: Throwing power can be improved by

Increasing distance between the anode and cathode By reducing the voltage drop at the cathode By increasing current density Only (a) and (b)
Answer Explanation

MCQs 15: Electroplating is done

To protect the metals against corrosion To give shiny appearance to articles To repair the worn out materials All of these
Answer Explanation

MCQs 16: The power required for electro-deposition is

DC and very low voltage DC and high voltage AC and very low voltage AC and high voltage
Answer Explanation

MCQs 17: The metal oxide rectifier used for electrolytic process is placed along with the transformer

Inside the oil Outside the transformer but near to it Outside the transformer but far from it Half immersed in the oil
Answer Explanation

MCQs 18: For best visual performance, the range of brightness within the field of vision

Should be less than 3:1 Should be greater than 3:1 Should be less than 1:3 Should be greater than 1:3
Answer Explanation

MCQs 19: For avoiding hard and long shadows,

Large number of small luminaries mounted at a height of less than 2.5 m can be used Large number of small luminaries mounted at a height of not less than 2.5 m can be used Small number of small luminaries mounted at a height of less than 2.5 m can be used Small number of large luminaries mounted at a height of not less than 2.5 m can be used
Answer Explanation

MCQs 20: Maintenance factor is the ratio of

Lumens on the working plane under normal working conditions to the lumens on the working plane under ideal condition Lumens on the working plane under ideal working conditions to the lumens on the working plane under normal condition Lumens falling on the working plane to the lumens emitted by the working plane under ideal condition Lumens emitting by the working plane to the lumens falling on the working plane under ideal condition
Answer Explanation

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