Practice Pakistan's most useful MCQs for competitive exams

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

• (A)  Parallel flow with equal heat capacities
• (B)  Counter flow with equal heat capacities
• (C)  Counter flow with unequal heat capacities
• (D)  Parallel flow with unequal heat capacities

Answer

Submitted By :Ali Uppal

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?

• (A)  15
• (B)  25
• (C)  10
• (D)  30

Answer

Submitted By :Ali Uppal

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

• (A)  Steel
• (B)  Lignite
• (C)  Water
• (D)  Lime stone

Answer

Submitted By :Ali Uppal

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

• (A)  Creep
• (B)  Toughness
• (C)  Tensile strength
• (D)  Fatigue

Answer

Submitted By :Ali Uppal

‘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) ?

• (A)  V
• (B)  V/2
• (C)  2V
• (D)  3V

Answer

Submitted By :Ali Uppal

Ammonia gas can be dried by___________________?

• (A)  PCl5
• (B)  Quick lime
• (C)  CaCl2
• (D)  Concentrated H2SO4

Answer

Submitted By :Ali Uppal

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

• (A)  Ambient
• (B)  Dry bulb
• (C)  Dew point
• (D)  Wet bulb

Answer

Submitted By :Ali Uppal

An investment of Rs. 100 lakhs is to be made for construction of a plant, which will take two years to start production. The annual profit from the operation of the plant is Rs. 20 lakhs. What will be the payback time ?

• (A)  5 years
• (B)  7 years
• (C)  12 years
• (D)  10 years

Answer

Submitted By :Ali Uppal

Which of the following is not a mathematical method for evaluation of profitability of a chemical process plant ?

• (A)  Cash reserve
• (B)  Rate of return on investment
• (C)  Payout period
• (D)  Discounted cash flow based on full life performance

Answer

Submitted By :Ali Uppal

In which of the electric power generation system, the operating cost is minimum ?

• (A)  Thermal
• (B)  Nuclear
• (C)  Hydroelectric
• (D)  Fast breeder reactor

Answer

Submitted By :Ali Uppal