Petroleum Engineering Test 1 Nddc Scholarship

Correct Answer: B. Fuel oil

At a given temperature, fuel oil has the highest viscosity among the options. Viscosity is a measure of a fluid's resistance to flow, and heavier oils like fuel oil are more viscous than lighter ones like petrol, naphtha, or light diesel oil.

Correct Answer: B. Fuel oil

At a given temperature, fuel oil has the highest viscosity among the listed options. It is thicker and flows more slowly compared to naphtha, light diesel oil, and petrol, which are lighter and less viscous fractions of crude oil.

Correct Answer: C. both (a) & (b)

Crude petroleum oil is a primary fuel because it is found in nature and used directly or after minimal processing. It is also a fossil fuel as it is formed from the remains of ancient organisms over millions of years.

Correct Answer: C. 450–550

The molecular weight of crude oil typically falls within the range 450 to 550, depending on its composition. Crude oil is a complex mixture of hydrocarbons with varying chain lengths, and its average molecular weight reflects the presence of large, heavy molecules.

Correct Answer: B. Carbide theory

The Carbide theory (an inorganic theory) suggests petroleum formed from the reaction of metal carbides with water deep within the Earth's crust. It does not explain the presence of nitrogen and sulfur compounds in crude oil, which are typically derived from biological materials—something explained by organic origin theories like the Modern and Engler theories.

Correct Answer: C. both (a) and (b)

Higher vapour pressure in gasoline means it evaporates more readily, which leads to:

• Low flash point – it ignites at lower temperatures.

• High breathing loss – more evaporation causes greater losses during storage due to expansion and contraction (breathing) of tanks.

Correct Answer: B. Progressive Cavity Pump

A Progressive Cavity Pump uses a helical screw rotor inside a stator to create sealed cavities that move fluid in a continuous, smooth flow. This is commonly used in oilfield artificial lift systems.

Correct Answer: C. Howard Hughes, Sr.

In 1909, Howard Hughes, Sr. invented the first roller cutter bit, a dual-cone rotary drill bit, which significantly improved the efficiency of rotary drilling in the oil industry.

Correct Answer: D. Tripping

Tripping refers to the process of either pulling the drill string out of the hole (known as "tripping out") or running it back into the hole ("tripping in") during drilling operations.

Correct Answer: B. Observation Well

An observation well is specifically used for monitoring reservoir conditions, such as pressure, temperature, and fluid movement. It helps determine how pressure transients propagate from producing wells through the reservoir.