Waste Water Engineering Mcqs

Q:

What is the maximum concentration measured by a 72 series water process analyser?

A) 1500 mg/l B) 3000 mg/l
C) 3500 mg/l D) 4000 mg/l
 
Answer & Explanation Answer: A) 1500 mg/l

Explanation: • 72 Series: 10 – 1500 mg/l
• 73 Series: 300 – 30,000 mg/l
• 74 Series: 800 – 80,000 mg/l.

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23
Q:

What is the maximum percentage of saturation for dissolved oxygen analyser?

A) 98.9% B) 99.2%
C) 99.8% D) 99.9%
 
Answer & Explanation Answer: D) 99.9%

Explanation: Percent of saturation for dissolved oxygen analyser is 0 – 99.9%. Two methods of calibration are: standard with automatic temperature, altitude and salinity compensation and the other is Isolated with 4 – 20 mA, digital serial output.

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15
Q:

What is the price of water process analyser?

A) Rs. 380 B) Rs. 485
C) Rs. 525 D) Rs. 695
 
Answer & Explanation Answer: B) Rs. 485

Explanation: Water process analyser consists of single and dual Channels with a one step, push button calibration which displays DO and temperature for each channel.

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15
Q:

What is modern data acquisition systems called?

A) CADA B) SCADA
C) CAED D) CAD
 
Answer & Explanation Answer: B) SCADA

Explanation: Data acquisition systems effectively accumulate, format, record and display data transmitted by sensors. Modern data acquisition systems are called as Supervisory Control and Data Acquisition (SCADA) systems.

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17
Q:

How many types of time control systems are present?

A) 2 B) 3
C) 4 D) 5
 
Answer & Explanation Answer: B) 3

Explanation: There are three types are time control systems present in wastewater engineering. They are digital, analog and automatic control systems.

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17
Q:

Which of the following is not a read out device?

A) Float B) Computer screens
C) Indicators D) Recorders
 
Answer & Explanation Answer: A) Float

Explanation: The most common type of read out devices is indicators, recorders and totalizer on panels of computer screens. The display is placed locally, close to the equipment site or at a central operating room for the whole family.

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16
Q:

Tone is an electronic means of the signal transmission device.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: Electronic means include voltage, current, pulse duration, etc. The mechanical means of signal transmission include movement of a pen, indicator, float or cable. Pneumatic means include a detector or an amplifier.

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20
Q:

Which of the following are a pneumatic means of signal transmission?

A) Cable B) Indicator
C) Amplifier D) Current
 
Answer & Explanation Answer: C) Amplifier

Explanation: Pneumatic means include a detector or an amplifier. The mechanical means of signal transmission include movement of a pen, indicator, float or cable. Electronic means include voltage, current, pulse duration, etc.

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