Vehicle Dynamics Question Bank for(Module 1 to 3) UT Answer Key

MCQ SET
Course Code and Name: (AEC802) Vehicle Dynamics ( CBCGS)			Institute Name: Theem College of Engineering
Class: BE Automobile			Department : Automobile Engineering
Semester: VIII			Name of Teacher :  Prof Mohd Raees
Module No	Q NO	QUESTION	OPTIONS				Correct Answer
			A	B	C	D
1	1	the steep angles of wind shield leads to?	increase in drag	decrease in drag	no chaange in drag	increase or decrease of drag	A
	2	the steep angles of wind shield leads to?	increase in solar heating	decrease in solar heating	no chaange in solar heating	increase or decrease solar heating	B
	3	Can shielding wheel and wheel well reduce protuberance drag?	Yes	No	unpredictable	irrelevent	A
	4	Can the decrease in clearence underside the vehicle and road reduce underbody drag?	Yes	No	unpredictable	irrelevent	A
	5	the shallow angles of wind shield leads to?	increase in solar heating	decrease in solar heating	no chaange in solar heating	increase or decrease solar heating	A
	6	As the ststic pressure over the vehicle hood increases the velocity will	irrelevant	constant	increase	decrease	C
	7	At distance well above vehicle where the stream lines are straight, the static pressure here is ?	constant	increases	decreases	same as ambient	D
	8	with increase in temperature of the tire thr rolling resistance coefficient of the tire will?	increases	decreases	no change	no dependency	B
	9	The pressure at the back side of a vehicle is same as the front side	no drag is produced	drag is produced	drag increases	drag decreases	A
	10	Skin drag is due to	slip	friction	pressure drop	skid of air	B
	11	The point were the boundary layer seperates is called as ?	detachable point	point of inflextion	seperation point	null point	C
	12	The moment along lateral axis of the vehicle is called?	Bouncing	Yawing	Rolling	Pitcing	D
	13	The moment of a vehicle along longitudinal axis of the vehicle is called?	Bouncing	Yawing	Rolling	Pitcing	C
	14	The protuberance drag is due to?	front shield	roof	wheel and wheel well	bonnet	C
	15	The protuberance drag is due to?	front shield	roof	Drip rail	bonnet	C
	16	When stagnating points kept low on the frontal profile of vehicle the drag obtained is?	no change	Irrelevant	Maximum	Minimum	D
	17	The deck lid spoiler	reduces drag	increases drag	produces no change in drag	none of the above	B
	18	The resistance offered by ground towards movement of wheel is called	ground reistance	slip resistance	rolling resistance	aerodynamic resistance	A
	19	the shallow angles of wind shield leads to?	increase in drag	decrease in drag	no chaange in drag	increase or decrease of drag	B
	20	which is the aerodynamic aid?	wheel and wheel well	bumper spoiler	front shield	roof	B
	21	The flow blocking surfaces installed at the perimeter of the radiator, to improve flow through radiator at low vehicle speed is called?	Car head	Radiatoe	Air blocker	Air dams	D
	22	The deck lid spoiler	reduces rear lift	increases rear lift	produces no change in lift	none of the above	A
	23	The deck lid spoiler	stabilized vortices	initiates vortice formation	donot effect vortices	un-stabilized vortices	A
	24	Underbody drag is due to following components?	Windshield	suspension and exhaust system	Bonnet	Roof	B
	25	For compressible flow which equation is used	Bernoullis equation	Euler's equation	Newtons equation	flow equation	B
	26	For incompressible flow which equation is used	Bernoullis equation	Euler's equation	Newtons equation	flow equation	A
	27	bernoullis equation is derived from	Newtons 3nd law	Euler's equation	Newtons 1nd law	Newtons 2nd law	D
	28	the bernoullis equation is given by total pressure which is	sum of static and dynamic pressure	static pressure	dynamic pressure	internal pressure	A
	29	Aerodynamic resistance becomes equal to rolling resistance at what speeds ?	10-20mph	20-30mph	50-60mph	70-80mph	C
	30	what percentage reduction in overall drag coeffiient is obtained by rounding low hood	85 to 95%	5 to 15%	65 to 85%	45 to 65%	B
	31	the fornumale 0.5*density*(Velocity^2)	static pressure	dynamic pressure	internal pressure	external pressure	B
	32	The relative velocity when the streamline hits the bumper is?	40kmph	Zero	high	medium	B
Module No	Q NO	QUESTION	OPTIONS				Correct Options
			A	B	C	D
	1	In comparison with a radial tyre, one advantage of a bias ply tyre is	Longer life	Lower rolling resistance	Smoother ride at low speeds	less life	C
	2	In radial tyres	One ply layer runs diagonally one way and another layer runs diagonally the other way	All plies run parallel to one another and vertical to tyre bead	Inner tubes are always used	One ply layer runs parallel one way and another layer runs diagonally the other way	A
	3	The basic purpose of tyres is to	Grip the road and provide good traction	Substitute for springs	Act as brake	Act as suspension	A
	4	In bias ply tyres	All plies run parallel to one another	Belts of steel mesh are used in the tyres	One ply layer runs diagonally one way and another layer runs diagonally the other way	Inner tubes are always used	C
	5	The main function of the tread pattern on tyre is that	The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating	The crests between the tread grooves absorb road noise	In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface	The tread pattern protects the tyre's inner carcass from small stones and pieces of glass	C
	6	Which part of the automobile tyre is subjected to greatest flexing action?	Bead	Side wall	Shoulder	Tread	B
	7	An under-inflated tyre will wear the tread most	Near the centre	Near the edges	In the lateral direction	In the cross direction	B
	8	The basic purpose of tyre rotation on automobiles is to	Avoid ply separation	Equalize wear	Get better ride	Act as brake	B
	9	The basic purpose of providing caster angle on wheels is to	Prevent uneven tyre wear	Maintain directional control	Bring the road contact of the tyre under the point of load	Compensate for wear in the steering linkage	B
	10	Two general types of tyres are	Tube type and tubeless	Solid and tubeless	Air and pneumatic	Split rim and drop centre	A
	11	An overinflated tyre will wear the tread most near the	Edges	Corners	Centre	Lateral direction	C
	12	Under acceleration and braking, additional slip in the contact patch is observed as a result of deformation of rubber elements in the Tyre tread, as they deflect to develop and sustain the force called.	Compressible force	Friction force	Tensile force	Newton force	B
	13	SAE Tyre axis system describes the following factors	Characteristics of Tyre	Forces and Moments acting on the Tyre	Tubeless and Tube Tyre	Wheel alignment and Wheel balancing	B
	14	For a given Tyre the cornering stiffness is dependent on following two main variables	Tyre size and type of Tyre	Number of plies and Cord angle	Wheel width and tread design	Load and inflation pressure	D
	15	Two important angles associated with a rolling wheel are	Slip angle and Camber angle	Camber angle and king pin inclination	Toe-in and Toe-out	Caster and Camber angle	A
	16	Zero lateral force coincides with the zero slip angle for	Tubeless Tyre	Actual Tyre	Tube Tyre	An ideal Tyre	D
	17	The slope of lateral force curve evaluated at zero slip angle for a tyre is known as	Cornering stiffness	Vertical stiffness	Longitudinal stiffness	Lateral stiffness	A
	18	In cornering bias plies allow the tread to roll under, putting more load on	Inner ribs	Side walls	Outer ribs	Centre	C
	19	One of the important functions of a Tyre is to develop the following type of forces to control the vehicle	Normal forces	Tractive forces	Frictional forces	Lateral forces	D
	20	The lateral inclination of the Tyre is called	slip angle	King pin inclination	Castor angle	Camber angle	D
	21	One of the components of outward force at each end of the car while cornering is known as:	Cornering thrust	Camber thrust	Castor thrust	Lateral thrust	D
	22	The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of	Section width to section height	Section height to section width	Wheel diameter to section height	Wheel diameter to section width	B
	23	If r=effective rolling radius, w=angular velocity of the wheel and v=forward velocity: then the Slip(S%) produced in the contact patch is given by:	S%=(1-rw/v)x100	S%=(1-v/rw)x100	S%=(v/rw-1)x100	S%=(rw-1/v)x100	A
	24	When a rolling pneumatic tyre is subjected to a lateral force, the tyre drift’s to side. Which angle  will be created between direction of tyre heading and direction of travel.	Camber angle	Caster angle	Slip angle	Cornering angle	C
	25	When the slip angle is zero the lateral force is	20	0	1	8	B
	26	The cornering coefficient is the cornering stiffness normalized by the	Lateral load	Vertical load	Longitudinal load	No load	B
	27	Centre plane of the tyre normal to the axis of rotation is known as	Wheel Centre	Wheel Plane	Centre of tyre contact	Slip angle	B
	28	Elements of the tyre tread passing through the tyre contact patch exerts a	Yeild stress	Tensile stress	Shear stress	Compressive stress	C
	29	The plies are reffered to as	Beads	Tread	Cords	Carcass	D
	30	In case of wore wheel the vehicle weight is supported by the wires in	Tension	Compression	Bending	Shear	A
	31	The term ply rating with the refernce to a tyre refers to	Actual no.of plies	Recommended inflation pressure	Aspect ratio	Rated Strength	D
	32	Tread distortion is least on	Radial ply tyres	Cross ply tyres	Cross ply belted tyres	Bias ply tyres	A
	33	Out of round break drums cause the tyres to wear	On the inside	On the outside	In single spots	Uniformly all round	C
	34	The effect of having excess camber is	Excessive steering alignment torque	Hard steering	Too much traction	Uneven tyre wear	D
	35	_____________ is the characteristic that describes the tire's tendency to roll like a cone	Conicity	Ply steer	Radial run-out	Lateral run-out	A
	36	___describes the lateral force a tire generates due to asymmetries in its carcass as is rolls forward with zero slip angle	Conicity	Ply steer	Radial run-out	Lateral run-out	B
	37	______is also produced when a tire rolls at a non zero camber angle	Aligning moment	Radial run-out	Slip angle	Lateral run-out	A
	38	What is the angle known between a rolling wheel's actual direction of travel and the direction towards which it is pointing?	Caster	Camber	Slip angle	Side thrust Angle	C
	39	Which statement is correct for the given diagram	Modal  resonance of tyre in vertical plane showing second mode	Modal  resonance of tyre in vertical plane showing Third mode	Tyres Cross ply direction	Modal  resonance of tyre in vertical plane showing Fourth mode	A
	40	Which statement is correct for the given diagram	Modal  resonance of tyre in vertical plane showing second mode	Modal  resonance of tyre in vertical plane showing Third mode	Tyres Cross ply direction	Modal  resonance of tyre in vertical plane showing Fourth mode	B
	41	In the following diagram corrosponding to tyre what denotes by letter "X"?	Conicity	Ply steer	Radial run-out	Lateral run-out	B
	42	In the following diagram corrosponding to tyre what denotes by letter "X"?	Conicity	Ply steer	Radial run-out	Lateral run-out	A
	43	In the Tyre magic formula developed by Hans Bastiaan Pacejka, What the letter "B" denotes?	Shape Factor	Peak value	Stiffness Factor	Curvatutre factor	C
	44	In the Tyre magic formula developed by Hans Bastiaan Pacejka, What the letter "C" denotes?	Shape Factor	Peak value	Stiffness Factor	Curvatutre factor	A
	45	In the Tyre magic formula developed by Hans Bastiaan Pacejka, What the letter "D" denotes?	Shape Factor	Peak value	Stiffness Factor	Curvatutre factor	B
	46	In the Tyre magic formula developed by Hans Bastiaan Pacejka, What the letter "E" denotes?	Shape Factor	Peak value	Stiffness Factor	Curvatutre factor	D
	47	Select the correctTyre magic formula developed by Hans Bastiaan Pacejka	y=D sin [ C arctan{Bx-E(B-arctanBx)}]	y=D sin [ C arcsec{Bx-E(Bx-arctanBx)}]	y=D cos [ C arctan{x-E(Bx-arctanBx)}]	y=D sin [ C arctan{Bx-E(Bx-arctanBx)}]	D
	48	The plot on a chart representing a tire’s maximum grip in both the lateral (cornering left or right) and longitudinal (braking and accelerating) is known as:	Curvatutre factor	Friction Circle	Slip angle plot	Conicity	B
	49	The most usual cause of excessive tyre wear is:	Sudden braking	Over inflation	Under inflation	excessive speed	C
	50	To equalize tyre wear, it is suggested that tyres be rotated from one wheel to another every	80 kms	800 kms	8000 kms	80000 kms	C
	51	The main function of the tread pattern on tyre is that:	The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating	The crests between the tread grooves absorb road noise	In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface	The tread pattern protects the tyre's inner carcass from small stones and pieces of glass	C
	52	__________has been trated as a mechanism for generating forces by which a vehicle may be controlled in braking and turning	Tire	Steering column	Differential	Propeller shaft	A
	53	With regard to ride dynamics what is seen to behave primarily as a spring which absorbs the roughness feature.	Tire	Steering column	Differential	Propeller shaft	A
	54	With regard to Tyre dynamics , what is define as the ratio of acceleration on the axle per unit of road displacement at the contact patch	Resonances	Transmissibility	Footprint Stiffness	Magnification factor	B
	55	Using  Tyre magic formula estimate breaking effort developed by the tire with a normal load 6KN at a skid of -25 percent. ( take B=0.210, C=1.67, D=6090 and E=0.686)	( 3173.74 N )	( - 3173.74 N )	( - 5178.56 N )	( 5178.56 N )	B
	56	Using  Tyre magic formula estimate breaking effort developed by the tire  at a skid of -25 percent. ( take B=0.210, C=1.67, D=5090 and E=0.686)	( 3173.74 N )	( - 3173.74 N )	( - 2652.60 N )	( 2652.60 N )	C
	57	Using  Tyre magic formula estimate breaking effort developed by the tire with a normal load 6KN at a skid of -25 percent. ( take B=0.210, C=1.87, D=6090 and E=0.686)	( 3173.74 N )	( - 1433.4 N )	( - 5178.56 N )	( 5178.56 N )	B
Module No	Q NO	QUESTION	OPTIONS				Correct Answer
			A	B	C	D
	1	The suspension affects	ride and directional response	Stability	handling	ride	A
	2	Solid suspension used now a days  mainly for	passenger cars	racing cars	two wheelers	heavy vehicles	D
	3	The basic suspension movements are	pitching, rolling and yawing	pitching, rolling and bouncing	bouncing, rolling and yawing	pitching, bouncing and yawing	B
	4	The main disadvanatge of solid suspensions	wheel tramp and shimmy	camber change	more tyre wear	more links required to take loads	A
	5	The variale rate of spring is used mainly to	reduce natural frequency	increase natural frequency	to decrease mass	increase load carrying capacity	B
	6	due to application of lateral force acting on vehicle lateral load transfer is called as	Roll steer	pitch and squat	body roll	jounce	C
	7	Main disavantage of leaf spring is	not strong	hard	wind up phenomenon	vibrations	C
	8	Four link suspension used on	cars	trucks	buses	motorcycles	A
	9	The suspension which gives small deflections for small bumps is called as	Hard suspension	Soft suspension	interconnected suspension	passive suspension	A
	10	The main advantage of independent suspension is	no camber change	High Roll stiffness	friction between springs	low antidive characterstics	B
	11	The longitudinal weight transfer during acceleartion is reduced by	Anti dive Geometry	Anti pitch geometry	steering geometry	suspension geometry	B
	12	The point, where control arm forces are resolved, is called as	centre of gravity	Instantaneous centre	virtual reaction point	roll center	C
	13	The condition for full antipitch condition for solid drive rear axle is	e/d = h/L	e/d =2 h/L	e/d = L/h	d/e = L/h	B
	14	To achieve 100 % anti squat condition for solid axle suspension , an effective trailing arm length is about	2 times the elevation	3 times the elevation	5 times the elevation	4 times the elevation	C
	15	If pivot point locates above locus points in antidive then	front and rear will lift	front and rear will under jounce	front under jounce and rear will lift	front will lift and rear will under jounce	D
	16	100 % full anti dive will change	castor angle	camber angle	King pin inclination	toein	A
	17	The actual anti dive condition used in cars	80%	70%	50%	750%	C
	18	position of pivot in anti dive geometry is depend upon	drive torque	brake torque at front and rear	position of CG	none of the above	B
	19	To reduce pitch and dive during braking and accelerating, the types of suspension used is called as	Equilizing suspension	Passive suspension	independent suspension	solid suspension	A
	20	The stiffness of springs used for equilizing suspension is	less for front and greater for rear springs	greater for front and less for rear springs	same for front and rear springs	different for front and rear springs	C
	21	The principle used in interconnected suspension is	main suspension springs made harder than than interconnected suspension springs	main suspension springs made softer than than interconnected suspension springs	both the springs made of same stiffness	main suspension springs made softer than than interconnected suspension springs	B
	22	In passive supensions	spring and damper are absent	spring and damper are present	spring is absent	damper is absent	B
	23	In passive suspensions	less control on reactions of spring and damper	no control on reactions of spring	no control on reactions of spring and damper	no control on reactions of damper	C
	24	In semiactive suspension	a control system is used for damper	a control system is used for spring	a control system is used for spring and damper	only control system is used	C
	25	In full active suspension	spring and damper are absent	spring and damper are present	spring is absent and actuator with damper is present	damper is absent	C
	26	In full active suspension	all reactions are controlled	no control on reactions of spring	no control on reactions of spring and damper	no control on reactions of damper	A
	27	The example of self levelling suspension is	hydrolastic suspension	air suspension	active suspension	semi active suspension	B
	28	The function of active suspension is	roll control and ride control	roll control only	ride control only	dive control only	A
	29	It is possible to eliminate roll ntirely in	passive suspension	air suspension	active suspension	semi active suspension	C
	30	The disadvantages os active suspension are	weight ,cost and complexity	cost and no roll control	weight and no ride control	complexity and no height control	A
	31	The components of active suspension are	sensors and hydraulic actuators	hydraulic actuators only	sensors with pneumatic actuators	sensors with electromagnetic actuators	A
	32	The point at which lateral forces may be applied to sprung mass without roll, is called as	pitch centre	roll centre	dive centre	virtual reaction point	B
	33	The line joining front and rear roll centre is called as	anti dive line	anti pitch line	roll axis	anti squat line	C
	34	The distance of  roll centre from the ground is called as	roll centre height	elevation	pitch centre height	dive centre height	A
	35	High roll centre height will reduce the	vibrations of vehicle body	wheel shimmy	pitching	rolling	B
	36	In three link rear suspension the slope of roll axis	changes slightly	changes too much	remains unchanged	has no effect	C
	37	The independent suspensions are having ________ forces with it.	Lateral	Jacking	Braking	pitching	B
	38	when roll centre of independent suspensions is above the ground then the geometry is called as	swing geometry	positive swing geometry	negative swing geotry	antipitch geometry	B
	39	when roll centre of independent suspensions is below the ground then the geometry is called as	swing geometry	positive swing geometry	negative swing geotry	antipitch geometry	C
	40	The net effect of positive swing geometry during turning is	lowering of roll centre height	increase in roll centre height	no change in rollcentre height	no change in roll centre	A
	41	The effect of postive and negative swing geometry is	reduces bouncing	increaes bouncing	reduces pitching	reduces diving	A