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849. For infinite parallel planes having emis-sivities ε₁ & ε₂, the interchange factor for radiation from surface 1 to surface 2 is given by

A. (ε₁ + ε₂)/ε₁.ε₂

B. Ε₁.ε₂/(ε₁ + ε₂ – ε₁.ε₂)

C. Ε₁.ε₂

D. Ε₁ + ε₂

✅ The correct answer is option B.

852. The ratio of coil diameter to wire diameter of a spring is called the spring

A. Index

B. Deflection

C. Form co-efficient

D. None of these

✅ The correct answer is option A.

855. Two solutions A₁ & A₂ have pH value of 2 & 6 respectively. It implies that the solution

A. A₁ is more alkaline than solution A₂

B. A₁ is highly acidic

C. A₂ is very slightly acidic

D. Both B & C

✅ The correct answer is option D.

819. A spark ignition petrol engine has

A. Throttle valve

B. Carburettor

C. Both A & B

D. Neither A nor B

✅ The correct answer is option C.

822. The dew point of moist air becomes __________ with decrease in its relative humidity.

A. Less than the wet bulb temperature

B. More than the wet bulb temperature

C. More than the dry bulb temperature

D. Equal to wet bulb temperature

✅ The correct answer is option A.

825. The conventional mechnical transducer, which converts pressure signal to displacement signal is

A. Spring

B. Manometer

C. Strain gauge

D. None of these

✅ The correct answer is option B.

828. Coating provided on the electrodes used in the arc welding is not expected to

A. Add alloying elements

B. Prevent electrode from contamination

C. Stabilise the arc

D. Provide protective atmosphere to weld

✅ The correct answer is option B.

790. Sulphur is melted in the sulphuric acid plant most commonly by employing

A. Electrical heater

B. Steam heater

C. Direct fuel oil fired heater

D. Gas fired furnace

✅ The correct answer is option B.

793. The temperature at which a gas, when subjected to Joule-Thomson expansion, neither cools or heats up, is termed as the __________ temperature. Above this temperature the gas heats up on throttling and below this the gas cools down.

A. Isotactic

B. Saturation

C. Inversion

D. Throttling

✅ The correct answer is option C.

796. Lead is poured into the joint between two __________ pipes.

A. Mild steel

B. Concrete

C. Cast iron

D. Asbestos cement

✅ The correct answer is option C.

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