Question: The minimum temperature to which the water can be cooled in a cooling tower is the ______________ temperature of air?

• 1. Ambient
• 2. Dry bulb
• 3. Dew point
• 4. Wet bulb

Question: Ammonia gas can be dried by___________________?

• 1. PCl5
• 2. Quick lime
• 3. CaCl2
• 4. Concentrated H2SO4

Question: ‘Dikes’ are low height walls made around the storage vessels meant for storing hazardous & inflammable material (e.g., petroleum products). Volume of dikes is equal to (where, V = volume of the storage vessel) ?

• 1. V
• 2. V/2
• 3. 2V
• 4. 3V

Question: On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is__________________?

• 1. Creep
• 2. Toughness
• 3. Tensile strength
• 4. Fatigue

Question: Out of the following substances, one ton of ______________ will store the maximum heat for a rise of 30°C in temperature ?

• 1. Steel
• 2. Lignite
• 3. Water
• 4. Lime stone

Question: Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is ________________ mm?

• 1. 15
• 2. 25
• 3. 10
• 4. 30

Question: Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type________________?

• 1. Parallel flow with equal heat capacities
• 2. Counter flow with equal heat capacities
• 3. Counter flow with unequal heat capacities
• 4. Parallel flow with unequal heat capacities

Question: Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its________________?

• 1. Lower cost
• 2. Abundant availability
• 3. Resistance to vegetable acids as the tin plate are commercially used in ‘canning’ industry
• 4. None of these

Question: Steel produced from phosphatic iron is _______________ in nature?

• 1. Malleable
• 2. Ductile
• 3. Brittle
• 4. Tough

Question: Pick out the wrong statement ?

• 1. Geothermal energy is a non-conventional source of energy
• 2. Mass is converted into energy in both nuclear fission & fusion reaction
• 3. Inhalation of mercury vapour is not harmful for human beings
• 4. Inhalation of arsenic causes cancer