8247 + Mcqs in Chemical Engineering Page 134 McqOptions

6651.	Desert air coolers being rendered ineffective in rainy season is due to
A.	low humidity
B.	low temperature
C.	high humidity
D.	sunny weather
Answer» D. sunny weather

Discussion

6652.	Flywheel is provided in a machine to
A.	provide structural strength to the shaft.
B.	smoothen the power impluses.
C.	help in quick starting of the machine.
D.	none of these.
Answer» C. help in quick starting of the machine.

Discussion

6653.	Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher
A.	ductility
B.	impact strength
C.	machinability
D.	melting point
Answer» D. melting point

Discussion

6654.	L.D. converters are generally lined with
A.	magnesite
B.	fireclay
C.	chrome magnesite
D.	silica
Answer» D. silica

Discussion

6655.	When the weight of a ball inside the ball mill is just balanced by the centrifugal force,
A.	the ball abandons its circular path for a parabolic path.
B.	the ball abandans its parabolic path for a circular path.
C.	the ball continues to move on a circular path.
D.	the ball continues to move on a parabolic path.
Answer» B. the ball abandans its parabolic path for a circular path.

Discussion

6656.	In cold working of metal as compared to its hot working
A.	cracks and blow holes are eliminated.
B.	ductility and impact strength improves.
C.	appreciable strain hardening is produced.
D.	yield stress, hardness and fatigue strength is not at all affected.
Answer» E.

Discussion

6657.	__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.
A.	Lancing
B.	Shot peening
C.	Slugging
D.	Spinning
Answer» C. Slugging

Discussion

6658.	Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.
A.	scratch
B.	indentation
C.	dynamic
D.	rebound
Answer» B. indentation

Discussion

6659.	Which of the following is a weak acid ?
A.	HF
B.	HCl
C.	HI
D.	HBr
Answer» B. HCl

Discussion

6660.	Pig iron is a product of
A.	electric arc furnace
B.	cupola
C.	blast furnace
D.	open hearth furnace
Answer» D. open hearth furnace

Discussion

6661.	Unit molar solution of __________ is the best conductor of electricity.
A.	sodium chloride
B.	acetic acid
C.	sulphuric acid
D.	sucrose
Answer» D. sucrose

Discussion

6662.	A coal with high __________ content will ignite most easily.
A.	hydrogen
B.	oxygen
C.	volatile matter
D.	fixed carbon
Answer» D. fixed carbon

Discussion

6663.	The weight of a body at the centre of the earth is
A.	infinite.
B.	zero.
C.	same as on the surface of the earth.
D.	none of these.
Answer» C. same as on the surface of the earth.

Discussion

6664.	For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.
A.	heat rejection is lower.
B.	expansion & compression are isentropic.
C.	maximum temperature is higher.
D.	combustion is at constant volume.
Answer» B. expansion & compression are isentropic.

Discussion

6665.	The single most imortant requirement for a turbine blade material is
A.	damping
B.	resilience
C.	creep resistaned
D.	DBTT
Answer» D. DBTT

Discussion

6666.	A material being tested for endurance strength is subjected to the __________ load.
A.	impact
B.	completely reversed
C.	dynamic
D.	static & dynamic
Answer» C. dynamic

Discussion

6667.	The __________ of a vapor pressure thermometer is a secondary element.
A.	pointer
B.	Bourdon tube
C.	bulb
D.	none ofthese
Answer» C. bulb

Discussion

6668.	Emf developed by a thermocouple, while measuring a temperature of 600 C is about 5.5 mV. The type of thermocouple used is
A.	chromel-alumel
B.	iron-constantan
C.	platinum-platinum+rhodium
D.	either (a), (b) or (c)
Answer» D. either (a), (b) or (c)

Discussion

6669.	The symbol for "capillary line" in instrumentation diagram is
A.	<img src="/_files/images/chemical-engineering/process-control/344-49-1.png">
B.	<img src="/_files/images/chemical-engineering/process-control/344-49-2.png">
C.	<img src="/_files/images/chemical-engineering/process-control/344-49-3.png">
D.	<img src="/_files/images/chemical-engineering/process-control/344-49-4.png">
Answer» C. <img src="/_files/images/chemical-engineering/process-control/344-49-3.png">

Discussion

6670.	__________ is undesirable in thermocouples used in industries,
A.	Linear relation of emf to temperature
B.	Corrosion resistance
C.	Oxidation resistance
D.	Non-linear relation of emf to temperature
Answer» E.

Discussion

6671.	Select the correct statement from the following.
A.	The frequency response of a pure capacity process is unbounded.
B.	The phase lag of a pure time delay system decreases with increasing frequency.
C.	The amplitude ratio of a pure capacity process is inversely proportional to frequency.
D.	The amplitude ratio of a pure time delay system increases with frequency.
Answer» D. The amplitude ratio of a pure time delay system increases with frequency.

Discussion

6672.	Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a
A.	thermocouple
B.	reistance thermometer
C.	mercury in glass thermometer
D.	vapor pressure thermometer
Answer» B. reistance thermometer

Discussion

6673.	Compositional analysis of __________ is done using mass spectrometer.
A.	an isotope
B.	natural gas
C.	a solid
D.	an alloy
Answer» B. natural gas

Discussion

6674.	The function of a transducer is to
A.	modify the input signal.
B.	amplify the input signal.
C.	convert the primary signal into a more useful quantity, usually an electric impulse.
D.	codify/decodify the input signal.
Answer» D. codify/decodify the input signal.

Discussion

6675.	Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?
A.	Platinum-platinum + rhodium.
B.	Iron-constantan.
C.	Chromel-constantan.
D.	All will give the same output.
Answer» D. All will give the same output.

Discussion

6676.	Temperature measuring instruments are standardised mostly with __________ points of pure substances.
A.	melting
B.	boiling
C.	both (a) & (b)
D.	neither (a) nor (b)
Answer» D. neither (a) nor (b)

Discussion

6677.	Pick out the first order system from among the following.
A.	Damped vibrator.
B.	Mercury in glass thermometer kept in boiling water.
C.	Interacting system of two tanks in series.
D.	Non-interacting system of two tanks in series.
Answer» C. Interacting system of two tanks in series.

Discussion

6678.	The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ C.
A.	250
B.	500
C.	750
D.	1000
Answer» C. 750

Discussion

6679.	Volumetric expansion is the working principle of the __________ thermometers.
A.	mercury in glass
B.	constant volume gas
C.	vapor pressure
D.	bimetallic
Answer» B. constant volume gas

Discussion

6680.	Response of a system to a sinusoidal input is called __________ response.
A.	impluse
B.	unit step
C.	frequency
D.	none of these
Answer» D. none of these

Discussion

6681.	The closed loop pole of a stable second order system could be
A.	both real and positive.
B.	complex conjugate with positive real parts.
C.	both real and negative.
D.	one real positive and the other real negative.
Answer» D. one real positive and the other real negative.

Discussion

6682.	Smoke density of the flue gas going out of the chimney is measured by a
A.	polarograph
B.	thermal conductivity meter
C.	photo electric cell
D.	chromatograph
Answer» D. chromatograph

Discussion

6683.	Transfer function of transportation lag is
A.	<i>e<sup>TS</sup></i>
B.	<i>e<sup>-TS</sup></i>
C.	<img src="/_files/images/chemical-engineering/process-control/341-2-1.png">
D.	none of these
Answer» C. <img src="/_files/images/chemical-engineering/process-control/341-2-1.png">

Discussion

6684.	Which of the following is a desirable characteristic of an instrument ?
A.	High drift
B.	High fidelity
C.	High measuring lag
D.	Poor reproducibility
Answer» C. High measuring lag

Discussion

6685.	The operation of a rotameter is based on
A.	variable flow area.
B.	rotation of a turbine.
C.	pressure drop across a nozzle.
D.	pressure at a stagnation point.
Answer» B. rotation of a turbine.

Discussion

6686.	The temperature of tempering oil baths maintained at 400 C during heat treatment of steel is measured by a/an __________ thermocouple.
A.	chromel-alumel
B.	iron-constantan
C.	platinum-platinum/rhodium
D.	none of these.
Answer» C. platinum-platinum/rhodium

Discussion

6687.	Instrumentation in a plant offers the advantage of
A.	greater safety of operation
B.	better quality of product
C.	greater operation economy
D.	all (a), (b) and (c)
Answer» E.

Discussion

6688.	Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?
A.	Radiation/infrared pyrometer
B.	Filled system thermometer
C.	Mercury in glass thermometer
D.	Thermo electric pyrometer
Answer» B. Filled system thermometer

Discussion

6689.	Typical specifications for design stipulates the gain margin and phase margin to be respectively
A.	> 1.7 and > 30
B.	< 1.7 and > 30
C.	< 1.7 and < 30
D.	> 1.7 and < 30
Answer» B. < 1.7 and > 30

Discussion

6690.	Change of angle of refraction with composition comprises the working principle of a
A.	polarimeter
B.	polarograph
C.	spectrometer
D.	refractrometer
Answer» E.

Discussion

6691.	Which of the following instruments is not used for measuring sub-zero (<0 ) temperatures ?
A.	Platinum resistance thermometer
B.	Mercury in glass thermometer
C.	Vapor pressure thermometer
D.	Radiation pyrometer
Answer» E.

Discussion

6692.	A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ C.
A.	-38.9
B.	-11.9
C.	-60.9
D.	-80.9
Answer» B. -11.9

Discussion

6693.	__________ controller has the maximum stabilising time.
A.	P
B.	PD
C.	PI
D.	PID
Answer» D. PID

Discussion

6694.	The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since
A.	the function is exponential.
B.	the Laplace transform of integral of exp(at) has finite values only for s > a.
C.	the Laplace transform integral of exp(at) has initial values only for s > a.
D.	the function exp(at) is piece-wise continuous only for s > a.
Answer» C. the Laplace transform integral of exp(at) has initial values only for s > a.

Discussion

6695.	Meleoid gauge measures the __________ pressure.
A.	positive
B.	sub-atmospheric
C.	very high
D.	atmospheric
Answer» C. very high

Discussion

6696.	Which of the following thermocouples is capable of measuring a temperature of -50 C?
A.	Platinum - platinum + rhodium
B.	Chromel - alumel
C.	Iron-constantan
D.	Copper - constantan
Answer» B. Chromel - alumel

Discussion

6697.	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.
A.	961.93
B.	630.74
C.	1064.43
D.	1261.93
Answer» C. 1064.43

Discussion

6698.	The level of a liquid under pressure can be determined using
A.	bubbler system
B.	differential pressure manometer
C.	diaphragm box system
D.	air-trap system
Answer» C. diaphragm box system

Discussion

6699.	Temperature measurement range of iron-constantan thermocouple is 0 to 870 C. It can be used to measure sub zero temperature, because at lower temperature
A.	emf produced is very low of the order of microvolt.
B.	embrittlement of iron occurs.
C.	rusting of iron takes place.
D.	both (b) and (c).
Answer» E.

Discussion

6700.	Liquid flow rate in an open channel can not be measured by a/an
A.	orifice meter
B.	cipolletti weir
C.	rectangular weir
D.	V-notch
Answer» B. cipolletti weir

Discussion

Explore topic-wise MCQs in Engineering.

Desert air coolers being rendered ineffective in rainy season is due to

Flywheel is provided in a machine to

Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher

L.D. converters are generally lined with

When the weight of a ball inside the ball mill is just balanced by the centrifugal force,

In cold working of metal as compared to its hot working

__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

Which of the following is a weak acid ?

Pig iron is a product of

Unit molar solution of __________ is the best conductor of electricity.

A coal with high __________ content will ignite most easily.

The weight of a body at the centre of the earth is

For the same heat input &amp; compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

The single most imortant requirement for a turbine blade material is

A material being tested for endurance strength is subjected to the __________ load.

The __________ of a vapor pressure thermometer is a secondary element.

Emf developed by a thermocouple, while measuring a temperature of 600 C is about 5.5 mV. The type of thermocouple used is

The symbol for "capillary line" in instrumentation diagram is

__________ is undesirable in thermocouples used in industries,

Select the correct statement from the following.

Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

Compositional analysis of __________ is done using mass spectrometer.

The function of a transducer is to

Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?

Temperature measuring instruments are standardised mostly with __________ points of pure substances.

Pick out the first order system from among the following.

The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ C.

Volumetric expansion is the working principle of the __________ thermometers.

Response of a system to a sinusoidal input is called __________ response.

The closed loop pole of a stable second order system could be

Smoke density of the flue gas going out of the chimney is measured by a

Transfer function of transportation lag is

Which of the following is a desirable characteristic of an instrument ?

The operation of a rotameter is based on

The temperature of tempering oil baths maintained at 400 C during heat treatment of steel is measured by a/an __________ thermocouple.

Instrumentation in a plant offers the advantage of

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

Typical specifications for design stipulates the gain margin and phase margin to be respectively

Change of angle of refraction with composition comprises the working principle of a

Which of the following instruments is not used for measuring sub-zero (&lt;0 ) temperatures ?

A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ C.

__________ controller has the maximum stabilising time.

The Laplace transform of exp(at), where a &gt; 0, is defined only for the Laplace parameter, s &gt; a since

Meleoid gauge measures the __________ pressure.

Which of the following thermocouples is capable of measuring a temperature of -50 C?

Platinum resistance thermometer can be used upto antimony point which is __________ C, and is the temperature of equilibrium between solid antimony &amp; liquid antimony at normal atmospheric pressure.

The level of a liquid under pressure can be determined using

Temperature measurement range of iron-constantan thermocouple is 0 to 870 C. It can be used to measure sub zero temperature, because at lower temperature

Liquid flow rate in an open channel can not be measured by a/an

For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

Which of the following instruments is not used for measuring sub-zero (<0 ) temperatures ?

The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since

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.