mechanical engineering MCQs – Page 123

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 Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

2441. Hart mechanism has________________?
0

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) ?
0

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___________________?
0

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 _________________?
0

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______________?
0

A. close pair

B. cam pair

C. open pair

D. lower pair

E. higher pair

2446. Kleins construction is useful to determine__________________?
0

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___________________?
0

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 _______________?
0

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___________________?
0

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_________________?
0

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

2451. Higher pairs are those which have_________________?
0

A. elements of pairs not held together mechanically

B. surface contact between the two ele-ments when in motion

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

D. two elements that permit relative motion

E. none of the above

2452. Open pairs are those which have__________________?
0

A. elements of pairs not held together mechanically

B. none of the above

C. surface contact between the two ele-ments when in motion

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

E. two elements that permit relative motion

2453. In a shaper mechanism, the Coriolis component of acceleration will_______________?
0

A. not exist

B. unpredictable

C. none of the above

D. depend on position of crank

E. exist

2454. In a darg link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is _______________?
0

A. none of the above

B. less than sum of other two

C. greater than sum of other two

D. there is no such relationship

E. equal to sum of other two

2455. According to Kennedys theorem, if three bodies have plane motions, their instantaneous centers lie on___________________?
0

A. a triangle

B. a point

C. a curve

D. a straight line

E. two lines

2456. Tangential acceleration direction is_________________?
0

A. perpendicular to angular velocity

B. along the angular velocity

C. opposite to angular velocity

D. none of the above

E. may be any one of these

2457. In its simplest form, a cam mechanism consists of following number of links___________________?
0

A. 4

B. 1

C. 3

D. none

E. 2

2458. In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is________________________?
0

A. 45 mm

B. none of the above

C. slightly less than 95 mm

D. 95 mm

E. slightly more than 95 mm

2459. The number of centers in a crank driven slider crank mechanism are_______________?
0

A. 6

B. 2

C. 4

D. may be any number depending upon position of mechanism

E. 0

2460. In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links_________________?
0

A. will remain same

B. could change or remain unaltered depending oh which link is fixed

C. will change

D. none of the above

E. will not occur

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