chemical engineering Mcqs
4651. When the damping co-efficient (?) is unity, the system is __________________?
comments icon0

A. Underdamped

B. Critically damped

C. Overdamped

D. Highly fluctuating

4652. Response of a linear control system for a change in set point is called __________________?
comments icon0

A. Transient response

B. Servo problem

C. Frequency response

D. Regulator problem

4653. A pyrheliometer is an instrument used for measuring the_________________?
comments icon0

A. Bright sunshine period

B. Diffuse radiation

C. None of these

D. Beam radiation
4654. Mass number of an atom is the sum of the numbers of_________________?
comments icon0

A. Neutrons and protons

B. Protons and electrons

C. Neutrons and electrons

D. Both A. & B.
4655. 1 BTU/ft3 is approximately equal to _____________ kcal/m3?
comments icon0

A. 1

B. 252

C. 9

D. 4

4656. Pressure of 0.0001 absolute psi can be measured by _____________ gauge?
comments icon0

A. None of these

B. Mcleod

C. Pirani

D. Thermocouple

4657. Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant) ?
comments icon0

A. nRT/V

B. P/nRT

C. V/nRT

D. nRT/P

4658. Flapper nozzle is used in a/an ______________ controller?
comments icon0
A. Pneumatic

B. None of these

C. Electronic

D. Hydraulic

4659. Which of the following is an exothermic reaction ?
comments icon0

A. Decomposition of water

B. Conversion of graphite to diamond

C. None of these

D. Dehydrogenation of ethane to ethylene

4660. On-off control which is a special case of proportional control, has a band width of about _____________ percent?
comments icon0

A. 75

B. 25

C. 100

D. 0
4661. Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a __________________?
comments icon0

A. Vapor pressure thermometer

B. Mercury in glass thermometer

C. Thermocouple

D. Resistance thermometer

4662. The rate of material _____________ is zero in case of a steady state system?
comments icon0

A. Production

B. Accumulation

C. Input

D. Generation

4663. At standard conditions, N2 + 2O2 ? 2NO2; ?G = 100 kJ/mole NO + O2 ? 2NO2; ?G = -35 kJ/mole The standard free energy of formation of NO in kJ/mole is___________________?
comments icon0

A. 170

B. 15

C. 30

D. 85
4664. Specific gravity of a liquid cannot be measured by a/an __________________?
comments icon0

A. Specific gravity bottle

B. Anemometer

C. Hydrometer

D. Pycnometer

4665. Bode stability method uses ____________ loop transfer function?
comments icon0
A. Open

B. Neither A. nor B.

C. Either A. or B.

D. Closed

4666. Smoke density of the flue gas going out of the chimney is measured by a __________________?
comments icon0

A. Chromatograph

B. Photo electric cell

C. Thermal conductivity meter

D. Polarograph

4667. The hydroxyl ion (OH-) concentration in a solution having pH value 3 will be_________________?
comments icon0

A. 4-Oct

B. 10-Oct

C. 3-Oct

D. 10-11
4668. Platinum resistance thermometer is the international standard for temperature measurement between __________________?
comments icon0

A. Triple point of hydrogen and freezing point of antimony

B. 13.81K to 903.9K

C. Both A. and B.

D. Neither A. nor B.

4669. N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample? (Molecular weight of urea = 60) ?
comments icon0

A. 80%

B. 90%

C. 98%

D. 95%

4670. Raoults law is obeyed by a _____________ solution?
comments icon0

A. Molar

B. Normal

C. Saturated

D. None of these
4671. Which of the following is a desirable characteristic of an instrument ?
comments icon0

A. High measuring lag

B. High fidelity

C. Poor reproducibility

D. High drift

4672. The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches ___________________?
comments icon0
A. ?

B. 0

C. -1

D. 1

4673. The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly__________________?
comments icon0

A. Hyperbolic

B. Parabolic

C. Non-linear

D. Linear
4674. Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the corresponding states. At equal reduced conditions i.e., at the corresponding state, the ____________ of different gases are nearly the same?
comments icon0

A. Molecular weight

B. Humidity

C. Compressibility

D. None of these

4675. Mass spectrometer is used for the composition analysis of____________________?
comments icon0

A. None of these

B. Solids

C. Isotopes

D. Alloys

4676. Zirconia probe is used for the continuous measurement of ______________ flue gases going out of the furnace?
comments icon0

A. Temperature of

B. Carbon dioxide in

C. Carbon monoxide in

D. Oxygen in
4677. The effect of pressure on the heat capacity of the gases ______________ is negligible?
comments icon0

A. At pressure below one atmosphere

B. Below the critical temperature

C. Both A. & B.

D. Neither A. nor B.

4678. Measurement of sub-zero Celsius temperature in industry is done most commonly by __________________?
comments icon0

A. Gas thermometers

B. Bi-metallic thermometers

C. Resistance thermometers

D. Thermocouples

4679. Helium gas constant volume thermometer is suitable for the measurement of a temperature of ______________ C?
comments icon0

A. > 800

B. > 0

C. < 0

D. < 100

4680. Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?
comments icon0

A. Thermo electric pyrometer

B. Radiation/infrared pyrometer

C. Mercury in glass thermometer

D. Filled system thermometer

4681. Starting temperature of optical radiation pyrometer is ______________ C?
comments icon0

A. 1200

B. 400

C. 1500

D. 800
4682. Which of the following ratios defines the recycle ratio in a chemical process ?
comments icon0

A. Gross feed stream/recycle feed stream

B. Recycle stream/gross feed stream

C. Recycle stream/fresh feed stream

D. None of these

4683. On-off controllers are normally used for________________?
comments icon0

A. None of these

B. Temperature changes

C. Flow rate changes

D. Low loads
4684. A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) ?
comments icon0

A. 140

B. 345

C. 485

D. 350
4685. Mercury manometer (U-tube type) exemplifies a ______________ order system?
comments icon0

A. Zero

B. Third

C. First

D. Second
4686. Dilatometer is used to measure __________________?
comments icon0
A. Contraction/expansion due to changes in temperature

B. Deflection

C. Strain

D. Stress

4687. Transfer function of transportation lag is___________________?
comments icon0

A. eTS

B. e-TS

C. 1/(Ts + 1)

D. None of these

4688. Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a ________________?
comments icon0

A. Pitot tube

B. Flow nozzle type flowmeter

C. Magnetic flowmeter

D. Turbine flowmeter

4689. In an exothermic chemical reactor, the manipulated variable is the flow rate of_______________?
comments icon0
A. Coolant

B. Product

C. None of these

D. Reactants

4690. The operation of a Rotameter is based on ________________?
comments icon0

A. Pressure at a stagnation point

B. Variable flow area

C. Pressure drop across a nozzle

D. Rotation of a turbine

4691. Platinum resistance thermometer can be used upto antimony point which is ____________ C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure?
comments icon0

A. 1261.93

B. 630.74

C. 1064.43

D. 961.93

4692. Which of the following judges the accuracy of an instrument ?
comments icon0

A. None of these

B. Drift

C. Static error

D. Dead zone

4693. For an input forcing function, X(t) = 2t2, the Laplace transform of this function is________________?
comments icon0

A. 2/s3

B. 4/s2

C. 2/s2

D. 4/s3
4694. Thermistors are made of__________________?
comments icon0
A. Metal oxides

B. Nickel-chromium alloys

C. Ultra pure metals

D. Iron-copper alloys

4695. Normal mercury thermometer can be used to measure a temperature of about 300C. However, its maximum temperature measurement range can be increased upto about 500C by__________________?
comments icon0

A. Increasing the diameter of the tube

B. Using steel tube in place of glass tube

C. Filling nitrogen under pressure in the stem

D. Accounting for the tube expansion

4696. 40 gms each of the methane and oxygen are mixed in an empty container maintained at 40C. The fraction of the total pressure exerted by oxygen is_________________?
comments icon0

A. 4-Jan

B. 2-Jan

C. 3-Feb

D. 1/3
4697. Paramagnetism method is not used for the composition determination of ______________ in gases?
comments icon0

A. Oxygen

B. Carbon dioxide

C. Any of these

D. Oxides of nitrogen

4698. Viscosity of atmospheric air may be about _____________ centipoise?
comments icon0
A. 0.015

B. 1.5

C. 150

D. 15

4699. Range of hydrogen gas constant volume thermometer is _____________ C?
comments icon0
A. 0 to 100

B. 100 500

C. -10 to 20

D. 400 1000

4700. Which of the following thermocouples has the least temperature measurement range ?
comments icon0

A. Iron-constantan

B. Copper-constantan

C. Chromel-alumel

D. Platinum-platinum/rhodium