MCQOPTIONS
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MCQOPTIONS
This section includes 470 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at |
| A. | 45° to each other |
| B. | 90° to each other |
| C. | 120° to each other |
| D. | 180° to each other |
| Answer» C. 120° to each other | |
| 102. |
The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve. |
| A. | greater than |
| B. | less than |
| C. | Can't say |
| D. | None of these |
| Answer» B. less than | |
| 103. |
The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r1 and r2 = External and internal radii of collar respectively) |
| A. | μ W (r1 + r2) |
| B. | μ W (r1r2) |
| C. | μ W (r1 - r2) |
| D. | None of these |
| Answer» B. μ W (r1r2) | |
| 104. |
Two heavy rotating masses are connected by shafts of lengths l1, l2 and l3 and the corresponding diameters are d1, d2 and d3. This system is reduced to a torsionally equivalent system having uniform diameter d = d1 of the shaft. The equivalent length of the shaft is |
| A. | (l₁ + l₂ + l₃)/3 |
| B. | l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³ |
| C. | l = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴ |
| D. | l₁ + l₂ + l₃ |
| Answer» D. l₁ + l₂ + l₃ | |
| 105. |
Due to slip of belt, the velocity ratio of the belt drive increases. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 106. |
In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from |
| A. | 50° - 60° |
| B. | 60° - 70° |
| C. | 70° - 80° |
| D. | 80° - 90° |
| Answer» E. | |
| 107. |
In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as |
| A. | tractive force |
| B. | swaying couple |
| C. | hammer blow |
| D. | none of these |
| Answer» D. none of these | |
| 108. |
The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in |
| A. | a single plane |
| B. | two planes |
| C. | three planes |
| D. | four planes |
| Answer» C. three planes | |
| 109. |
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft) |
| A. | 2π. √(q/I) |
| B. | 2π qI |
| C. | (1/2π). √(q/I) |
| D. | 1/2π |
| Answer» D. 1/2π | |
| 110. |
The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle) |
| A. | sin (θ + φ) + 1/ cos (θ - φ) + 1 |
| B. | cos (θ - φ) + 1/ sin (θ + φ) + 1 |
| C. | cos (θ + φ) + 1/ cos (θ - φ) + 1 |
| D. | cos (θ - φ) + 1/ cos (θ + φ) + 1 |
| Answer» D. cos (θ - φ) + 1/ cos (θ + φ) + 1 | |
| 111. |
For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that |
| A. | governor A is more sensitive than governor B |
| B. | governor B is more sensitive than governor A |
| C. | both governors A and B are equally sensitive |
| D. | none of the above |
| Answer» B. governor B is more sensitive than governor A | |
| 112. |
A flywheel is used to control the mean speed of an engine caused by the variations in load. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 113. |
In a locomotive, the resultant unbalanced force due to the two cylinders along the line of stroke, is known as |
| A. | tractive force |
| B. | swaying couple |
| C. | hammer blow |
| D. | none of these |
| Answer» B. swaying couple | |
| 114. |
In a four bar chain or quadric cycle chain |
| A. | each of the four pairs is a turning pair |
| B. | one is a turning pair and three are sliding pairs |
| C. | two are turning pairs and two are sliding pairs |
| D. | three are turning pairs and one is a sliding pair |
| Answer» B. one is a turning pair and three are sliding pairs | |
| 115. |
Bifilar suspension method is used to find the |
| A. | angular acceleration of the body |
| B. | moment of inertia of the body |
| C. | periodic time of the body |
| D. | frequency of vibration of the body |
| Answer» C. periodic time of the body | |
| 116. |
In involute gears, the pressure angle is |
| A. | dependent on the size of teeth |
| B. | dependent on the size of gears |
| C. | always constant |
| D. | always variable |
| Answer» D. always variable | |
| 117. |
The Klein's method of construction for reciprocating engine mechanism |
| A. | is a simplified version of instantaneous centre method |
| B. | utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine |
| C. | enables determination of coriolis component |
| D. | is based on the acceleration diagram |
| Answer» C. enables determination of coriolis component | |
| 118. |
The primary unbalanced force is more than the secondary unbalanced force. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 119. |
An exact straight line motion mechanism is a |
| A. | Scott-Russell's mechanism |
| B. | Hart's mechanism |
| C. | Peaucellier's mechanism |
| D. | all of these |
| Answer» E. | |
| 120. |
Which of the following mechanism is an approximate straight line motion mechanism? |
| A. | Watt's mechanism |
| B. | Grasshopper mechanism |
| C. | Robert's mechanism |
| D. | all of these |
| Answer» E. | |
| 121. |
Maximum fluctuation of energy in a flywheel is equal to (where I = Mass moment of inertia of the flywheel, E = Maximum fluctuation of energy, CS = Coefficient of fluctuation of speed, and ω = Mean angular speed = ) |
| A. | Iω(ω1 - ω2) |
| B. | Iω²CS |
| C. | 2ECS |
| D. | all of these |
| Answer» E. | |
| 122. |
The arrangement is called bevel gearing, when two __________ are connected by gears. |
| A. | intersecting and coplaner shafts |
| B. | non-intersecting and non-coplaner shafts |
| C. | parallel and coplaner shafts |
| D. | parallel and non-coplaner shafts |
| Answer» B. non-intersecting and non-coplaner shafts | |
| 123. |
A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a |
| A. | structure |
| B. | mechanism |
| C. | kinematic chain |
| D. | inversion |
| Answer» D. inversion | |
| 124. |
The periodic time of one oscillation for a simple pendulum is |
| A. | (1/2π). √(l/g) |
| B. | (1/2π). √(g/l) |
| C. | 2π. √(l/g) |
| D. | None of these |
| Answer» D. None of these | |
| 125. |
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by |
| A. | ω²R cos θ |
| B. | ω2(R - r1)cos θ |
| C. | ω²(R - r1)sin θ |
| D. | ω²r1 sin θ |
| Answer» C. ω²(R - r1)sin θ | |
| 126. |
The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at |
| A. | 45° in the direction of rotation of the link containing the path |
| B. | 45° in the direction opposite to the rotation of the link containing the path |
| C. | 90° in the direction of rotation of the link containing the path |
| D. | 180° in the direction opposite to the rotation of the link containing the path |
| Answer» D. 180° in the direction opposite to the rotation of the link containing the path | |
| 127. |
The sensitiveness of a governor depends upon the lift of the sleeve. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» B. Wrong | |
| 128. |
A governor is said to be isochronous when range of speed is zero for all radii of rotation of the balls within the working range, neglecting friction. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 129. |
A pair is said to be a kinematic pair, if the relative motion between them is completely or successfully constrained. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 130. |
A rotor supported at A and B carries two masses as shown in the below figure. The rotor is |
| A. | dynamically balanced |
| B. | statically balanced |
| C. | statically and dynamically balanced |
| D. | not balanced |
| Answer» D. not balanced | |
| 131. |
The instantaneous centres, which moves as the mechanism moves but joints are of permanent nature, are called permanent instantaneous centres. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 132. |
In the two rotor system as shown in the below figure (I1 < I2), a node of vibration is situated |
| A. | between I1, and I2 but nearer I1 |
| B. | between I1, and I2 but nearer to I2 |
| C. | exactly in the middle of the shaft |
| D. | nearer to I1 but outside |
| Answer» C. exactly in the middle of the shaft | |
| 133. |
For the brake to be self locking, the force P at C shown in the below figure, should |
| A. | be zero |
| B. | act in upward direction |
| C. | act in downward direction |
| D. | none of these |
| Answer» B. act in upward direction | |
| 134. |
The centre of suspension and centre of percussion are not interchangeable. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 135. |
The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r1 and r2 = External and internal radii of collar respectively) |
| A. | (1/2) μ W (r₁ + r₂) |
| B. | (2/3) μ W (r₁ + r₂) |
| C. | (1/2) μ W [(r₁³ - r₂³)/(r₁² - r₂²)] |
| D. | (2/3) μ W [(r₁³ - r₂³)/(r₁² - r₂²)] |
| Answer» B. (2/3) μ W (r₁ + r₂) | |
| 136. |
In an open pair, the two elements of a pair |
| A. | have a surface contact when in motion |
| B. | have a line or point contact when in motion |
| C. | are kept in contact by the action of external forces, when in motion |
| D. | are not held together mechanically |
| Answer» E. | |
| 137. |
The ratio of the driving tensions for V-belts is __________ times that of flat belts. (where β = Semi-angle of the groove) |
| A. | sin β |
| B. | cos β |
| C. | cosec β |
| D. | sec β |
| Answer» D. sec β | |
| 138. |
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because |
| A. | whole of the mechanism in the Ackerman steering gear is on the back of the front wheels |
| B. | the Ackerman steering gear consists of turning pairs |
| C. | the Ackerman steering gear is most economical |
| D. | both (a) and (b) |
| Answer» E. | |
| 139. |
If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be |
| A. | stable |
| B. | unstable |
| C. | isochronous |
| D. | none of these |
| Answer» D. none of these | |
| 140. |
In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular acceleration of the connecting rod is given by |
| A. | ω sinθ/(n² - sin²θ)^1/2 |
| B. | ω cosθ/(n² - cos²θ)^1/2 |
| C. | ω sinθ/(n² - cos²θ)^1/2 |
| D. | ω cosθ/(n² - sin²θ)^1/2 |
| Answer» E. | |
| 141. |
The inversion of a mechanism is |
| A. | changing of a higher pair to a lower pair |
| B. | turning its upside down |
| C. | obtained by fixing different links in a kinematic chain |
| D. | obtained by reversing the input and output motion |
| Answer» D. obtained by reversing the input and output motion | |
| 142. |
The maximum fluctuation of speed is the |
| A. | difference of minimum fluctuation of speed and the mean speed |
| B. | difference of the maximum and minimum speeds |
| C. | sum of maximum and minimum speeds |
| D. | variations of speed above and below the mean resisting torque line |
| Answer» C. sum of maximum and minimum speeds | |
| 143. |
Power of a governor is the |
| A. | mean force exerted at the sleeve for a given percentage change of speed |
| B. | workdone at the sleeve for maximum equilibrium speed |
| C. | mean force exerted at the sleeve for maximum equilibrium speed |
| D. | none of the above |
| Answer» E. | |
| 144. |
The ratio of velocities of the shafts connected by Hooke's joint is given by (where N and N1 = Speed of driving and driven shafts (in r.p.m.) respectively, θ = Angle through which the arms of the cross turn, and α = Angle of inclination between the two shafts) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 145. |
The minimum periodic time of a compound pendulum is |
| A. | (1/2π). √(kG/g) |
| B. | (1/2π). √(2kG/g) |
| C. | 2π. √(kG/g) |
| D. | 2π. √(2kG/g) |
| Answer» E. | |
| 146. |
The frictional torque transmitted by a cone clutch is same as that of |
| A. | flat pivot bearing |
| B. | flat collar bearing |
| C. | conical pivot bearing |
| D. | truncated conical pivot bearing |
| Answer» E. | |
| 147. |
Which of the following governor is used to drive a gramophone? |
| A. | Watt governor |
| B. | Porter governor |
| C. | Pickering governor |
| D. | Hartnell governor |
| Answer» D. Hartnell governor | |
| 148. |
Which of the following is a pendulum type governor? |
| A. | Watt governor |
| B. | Porter governor |
| C. | Hartnell governor |
| D. | none of these |
| Answer» B. Porter governor | |
| 149. |
The two links are said to have a pure rolling contact, when their instantaneous centre __________ on their point of contact. |
| A. | lies |
| B. | does not lie |
| C. | Can't say |
| D. | None of these |
| Answer» B. does not lie | |
| 150. |
A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal force |
| A. | the reaction on me inner wheels increases and on the outer wheels decreases |
| B. | the reaction on the outer wheels increases and on the inner wheels decreases |
| C. | the reaction on the front wheels increases and on the rear wheels decreases |
| D. | the reaction on the rear wheels increases and on the front wheels decreases |
| Answer» C. the reaction on the front wheels increases and on the rear wheels decreases | |