**661. High specific speed of a pump implies that, it is a/an _____________ pump?**

A. Centrifugal

B. Mixed flow**C. Axial flow**

D. None of these

**662. Velocity of liquid hydrocarbon fuels in a pipeline cannot be measured by magnetic flowmeters, because their ______________ is very low/small?**

A. Thermal conductivity**B. Electrical conductivity**

C. Specific gravity

D. Electrical resistivity

**663. The friction factor is___________________?**

A. Always inversely proportional to the Reynolds number

B. Not dimensionless

C. Not dependent on the roughness of the pipe**D. None of these**

**664. _____chart is a graph related to Antoine equation ?**

A. Ostwald**B. Cox**

C. Mollier’s

D. Enthalpy-concentration

**665. With a constant diameter impeller of a centrifugal pump _____________________?**

A. Its capacity varies directly as the square of speed**B. Head varies as the square of speed**

C. Horsepower input varies as the square of speed

D. Head varies as the speed

**666. Which of the following is an undesirable property of a manometric liquid ?**

A. Non-sticky & non-corrosive nature**B. High vapour pressure**

C. Low viscosity & surface tension

D. Low co-efficient of thermal expansion

**667. In Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the ______________ of its diameter?**

A. Inverse**B. Square root**

C. Second power

D. First power

**668. The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is_________________?****A. Q∝N : H∝N2 : P∝N3**

B. Q∝N2 : H∝N3 : P∝N

C. Q∝N : H∝N3 : P∝N2

D. Q∝N3 : H∝N : P∝N2

**669. A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is_________________?**

A. 25.61 kPa**B. 11.77 kPa**

C. 14.86 kPa

D. 21.13 kPa

**670. Efficiency of power transmission (ε) through a circular pipe is given by (ht – hf)/ht, which has a maximum value of _____________ percent?**

A. 33:3

B. 50**C. 66.6**

D. 88.8

**NOTEIF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.THANK YOU**