mechanical engineering MCQs – Page 49

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

2401. The example of rolling pair is________________?
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A. bolt and nut

B. ball and socket joint

C. all of the above

D. lead screw of a lathe

E. ball bearing and roller bearing
2402. Oldhams coupling is the ____________________?
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A. second inversion of single slider crank chain

B. fourth inversion of double slider crank chain

C. third inversion of slider crank chain

D. second inversion of double slider crank chain

E. third inversion of double slider crank chain
2403. If the opposite links of a four bar linkage are equal, the links will always form a_________________?
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A. triangle

B. parallelogram

C. rectangle

D. pentagon

E. trapezoid

2404. For a kinematic chain to be considered as mechanism___________________?
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A. none of the above

B. none of the links should be fixed

C. two links should be fixed

D. there is no such criterion

E. one link should be fixed
2405. Creep in belt drive is due to____________________?
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A. uneven extensions and contractions due to varying tension

B. larger size of the driver pulley

C. material of the pulley

D. material of the belt

E. expansion of belt

2406. Davis steering gear consists of__________________?
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A. higher pairs

B. lower pairs

C. rolling pairs

D. sliding pairs

E. turning pairs

2407. When a ship travels in a sea, which of the effect is more dangerous___________________?
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A. none of the above

B. pitching

C. rolling

D. steering

E. all of the above

2408. Kinematic pairs are those which have two elements that ______________?
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A. have surface contact

B. are held together

C. have line contact

D. have dynamic forces

E. permit relative motion
2409. Idler pulley is used___________________?
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A. for applying tension

B. all of the above

C. none of the above

D. for increasing -velocity ratio

E. for changing the direction of motion of the belt

2410. Whitworth quick return mechanism is obtained by inversion of___________________?
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A. five link mechanism

B. slider crank mechanism

C. none of the above

D. roller cam mechanism

E. kinematic chain

2411. If there are L number of links in a mechanism then number of possible inversions is equal to_______________?
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A. L 2

B. L + 1

C. L 1

D. L

E. L + 2

2412. The pressure angle of a cam depends upon___________________?
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A. lift of follower

B. angle of ascent

C. all of the above

D. sum of radii of base circle and roller follower

E. offset between centre lines of cam and follower

2413. For fluctuating loads, welsuited bearing is_________________?
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A. thrust bearing

B. roller bearing

C. needle roller bearing

D. sleeve bearing

E. ball bearing

2414. In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed_______________?
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A. none of the above

B. Wilson Hartnell governor

C. Hartung governor

D. Pickering governor

E. Inertia governor

2415. The example of spherical pair is_____________________?
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A. ball and socket joint

B. ball bearing and roller bearing

C. none of the above

D. bolt and nut

E. lead screw of a lathe

2416. A mechanism is an assemblage of ____________________?
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A. two links

B. four links or more than four links

C. all of the above

D. none of the above

E. three links

2417. The moment on the pulley which produces rotation is called ___________________?
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A. moment of momentum

B. momentum

C. inertia

D. work

E. torque
2418. Kleins construction can be used to determine acceleration of various parts when the crank is at_________________?
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A. inner dead centre

B. outer dead centre

C. all of the above

D. right angles to the link of the stroke

E. at 45 to the line of the stroke

2419. If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be_______________?
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A. same

B. none of the above

C. less

D. data are insufficient to determine same

E. more

2420. The lower pair is a_____________________?
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A. point contact pair

B. does not exist

C. closed pair

D. open pair

E. sliding pair

2421. A chain comprises of 5 links having 5 joints. Is it kinematic chain ?
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A. data are insufficient to determine it

B. unpredictable

C. it is a marginal case

D. no

E. yes

2422. Sense of tangential acceleration of a link_________________?
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A. none of the above

B. is opposite to that of velocity

C. could be either same or opposite to velocity

D. is same as that of velocity

E. is perpendicular to that of velocity

2423. A foot step bearing and rotor of a vertical turbine form examples of___________________?
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A. none of the above

B. partially constrained motion

C. successfully constrained motion

D. incompletely constrained motion

E. completely constrained motion

2424. Rectilinear motion of piston is converted into rotary by_______________?
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A. cross head

B. connecting rod

C. gudgeon pin

D. four bar chain mechanism

E. slider crank
2425. The number of links and instantaneous centers in a reciprocating engine mechanism are ___________________?
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A. 4, 6

B. 5, 4

C. 6, 4

D. 4, 5

E. 4, 4

2426. Cam angle is defined as the angle_________________?
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A. through which, the cam rotates during the period in which the follower remains in the highest position

B. during which the follower returns to its initial position

C. moved by the can from beginning of i ascent to the termination of descent

D. of rotation of the cam for a definite displacement of the follower

E. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

2427. In higher pair, the relative motion is_____________________?
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A. purely turning

B. purely sliding

C. purely rotary

D. purely surface contact

E. combination of sliding and turning
2428. The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as__________________?
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A. spherical pair

B. turning pair

C. rolling pair

D. lower pair

E. sliding pair

2429. It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by_______________?
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A. knuckle joint

B. Oldhams coupling

C. flexible coupling

D. universal joint

E. electromagnetic coupling

2430. In automobiles the power is transmitted from gear box to differential through _________________?
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A. Hookes joint

B. universal joint

C. bevel gear

D. Knuckle joint

E. Oldhams coupling

2431. For simple harmonic motion of the of follower, a cosine curve represents___________________?
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A. velocity diagram

B. all of the above

C. displacement diagram

D. none of the above

E. acceleration diagram
2432. Lower pairs are those which have___________________?
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A. two elements that permit relative motion

B. surface contact between the two elements when in motion

C. point or line contact between the two elements when in motion

D. none of the above

E. elements of pairs not -held together mechanically

2433. Inertia force acts___________________?
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A. along the direction of accel* force

B. none of the above

C. opposite to the direction of ace ing force

D. perpendicular to the accel< force

E. in any direction w.r.t. accel* force depending on the magnit two

2434. Cam size depends upon__________________?
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A. prime circle

B. base circle

C. none of the above

D. pitch circle

E. outer circle

2435. In S.H.M., acceleration is proportional to _________________?
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A. velocity

B. all of the above

C. displacement

D. rate of change of velocity

E. none of the above

2436. The maximum value of the pressure angle in case of cam is kept as________________?
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A. 30

B. 14

C. 20

D. 25.

E. 10

2437. The Bifilar suspension method is used to determine__________________?
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A. position of balancing weights

B. moment of inertia

C. centripetal acceleration

D. natural frequency of vibration

E. angular acceleration of a body

2438. Two systems shall be dynamically equivalent when____________________?
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A. M.I. of two about an axis through e.g. is equal

B. all of the above

C. e.g. of two coincides

D. the mass of two are same

E. none of the above

2439. Kleins construction gives a graphica construction for________________?
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A. acceleration polygon

B. angular acceleration

C. velocity polygon

D. slider-crank mechanism

E. four bar chain mechanism

2440. For the same lift and same angle of ascent, a smaller base circle will give_______________?
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A. none of the above is true

B. a small value of pressure angle

C. something else

D. there is no such relation with pressure angle

E. a large value of pressure angle
2441. Hart mechanism has________________?
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A. twelve links

B. five links

C. four links

D. eight links

E. six links
2442. Polar moment of inertia (IP) of ac disc is to ht determined by suspen by a wire and noting the frequei oscillations (f) ?
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A. Ip oc j

B. Ipocf

C. Ipoc-

D. Ipocf

E. none of the above

2443. An eccentric sheave pivoted at one point rotates and transmits oscillatory motion to a link whose one end is pivoted and other end is connected to it. This mechanism has___________________?
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A. 5 links

B. none of the above

C. 2 links

D. 4 links

E. 3 links

2444. In S.H.M., the velocity vector w.r.t. displacement vector _________________?
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A. could be anywhere.

B. are in phase

C. leads by 180

D. lags by 90

E. leads by 90
2445. A cam with a roller follower would con stitute following type of pair______________?
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A. close pair

B. cam pair

C. open pair

D. lower pair

E. higher pair
2446. Kleins construction is useful to determine__________________?
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A. acceleration of various parts

B. velocity of various parts

C. all of the above

D. angular acceleration of various parts

E. displacement of various parts

2447. A circle passing through the pitch point with its center at the center of cam axis is known as___________________?
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A. cam circle

B. prime circle

C. base circle

D. outer circle

E. pitch circle

2448. Instantaneous center of rotation of a link in a four bar mechanism lies on _______________?
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A. a point obtained by intersection on extending adjoining links

B. cant occur

C. right side pivot of this link

D. lift side pivot of this link

E. none of the above

2449. The absolute acceleration of any point P in a link about center of rotation 0 is___________________?
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A. none of the above

B. perpendicular to PO

C. along PO

D. along OP

E. at 45 to PO

2450. The sense of Coriolis component is such that it_________________?
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A. leads the sliding velocity vector by 180

B. is along the sliding velocity vector

C. none of the above

D. lags the sliding velocity vector by 90

E. leads the sliding velocity vector by 90