MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Dynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The crank-pin circle radius of a horizontal engine is 300 mm. The mass of the reciprocating parts is 250 kg. When the crank has travelled 30 from T.D.C., the difference between the driving and the back pressures is 0.45 N/mm2. The connecting rod length between centres is 1.2 m and the cylinder bore is 0.5 m. If the engine runs at 250 r.p.m. and if the effect of piston rod diameter is neglected, calculate the net load on piston. |
| A. | 88000 N |
| B. | 90560 N |
| C. | 78036 N |
| D. | 88357 N |
| Answer» E. | |
| 2. |
For the given data of an Internal combustion engine : Mass of parts = 180 kg bore = 175 mm, length of stroke = 200 mm, engine speed = 500 r.p.m., length of connecting rod = 400 mm and crank angle = 60 from T.D.C, find the inertia force. |
| A. | 17.56 N |
| B. | 19.2 N |
| C. | 18.53 N |
| D. | 18.00 N |
| Answer» D. 18.00 N | |
| 3. |
Crank effort is the product of crank pin radius and _______ |
| A. | Thrust on sides |
| B. | Crankpin effort |
| C. | Force acting along connecting rod |
| D. | Piston effort |
| Answer» C. Force acting along connecting rod | |
| 4. |
In the presence of frictional resistance, the expression for piston effort is _________ |
| A. | F(L) F(I) |
| B. | F(L) + F(I) |
| C. | F(L) F(I) R(f) |
| D. | F(L) F(I) + R(f) |
| Answer» D. F(L) F(I) + R(f) | |
| 5. |
In a horizontal engine, reciprocating parts are retarded when the piston moves from _________ |
| A. | TDC to BDC |
| B. | BDC to TDC |
| C. | Midway to TDC |
| D. | BDC to midway |
| Answer» C. Midway to TDC | |
| 6. |
In a horizontal engine, reciprocating parts are accelerated when the piston moves from _______ |
| A. | TDC to BDC |
| B. | BDC to TDC |
| C. | Midway to TDC |
| D. | BDC to midway |
| Answer» B. BDC to TDC | |
| 7. |
The net force acting on the crosshead pin is known as __________ |
| A. | Crank pin effort |
| B. | Crank effort |
| C. | Piston effort |
| D. | Shaft effort |
| Answer» D. Shaft effort | |