MCQOPTIONS
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MCQOPTIONS
This section includes 991 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The bearing characteristic number is given by (where p = Bearing pressure on the projected bearing area, Z = Absolute viscosity of the lubricant, and N = Speed of the journal) |
| A. | ZN/p |
| B. | p/ZN |
| C. | Z/pN |
| D. | N/Zp |
| Answer» B. p/ZN | |
| 102. |
The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ is equal to 6/6 + v. |
| A. | 10 m/s |
| B. | 12.5 m/s |
| C. | 15 m/s |
| D. | 20 m/s |
| Answer» E. | |
| 103. |
The radial distance from the top of a tooth to the bottom of a tooth is called clearance |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 104. |
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt, as |
| A. | (Kf + 1)/ (Kt + 1) |
| B. | (Kf - 1)/ (Kt - 1) |
| C. | (Kt + 1)/ (Kf + 1) |
| D. | (Kt - 1)/ (Kf - 1) |
| Answer» C. (Kt + 1)/ (Kf + 1) | |
| 105. |
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ . The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be |
| A. | τ/2 |
| B. | τ |
| C. | 2 τ |
| D. | 4 τ |
| Answer» C. 2 τ | |
| 106. |
When the frictional force helps to apply the brake, then the brake is said to be self-energizing brake. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 107. |
Oldham coupling is used to transmit power between two parallel shafts which are slightly offset. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 108. |
The ratio of number of teeth to the pitch circle diameter in millimetres is called circular pitch. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 109. |
The shafts of larger diameter are usually forged and turned to size in a lathe. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 110. |
The velocity factor for ordinary cut gears operating at velocities upto 12.5 m/s is equal to |
| A. | 0.75/(0.75 + √v) |
| B. | 3/(3 + v) |
| C. | 4.5/(4.5 + v) |
| D. | 6/(6 + v) |
| Answer» C. 4.5/(4.5 + v) | |
| 111. |
The spigot and socket joint is mostly used for pipes which are burried in the earth. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 112. |
The power transmitted by a belt drive is maximum when the maximum tension in the belt is __________ the centrifugal tension. |
| A. | equal to |
| B. | double |
| C. | three times |
| D. | six times |
| Answer» D. six times | |
| 113. |
According to Indian standard specifications, a plain carbon steel designated by 40C8 contains carbon |
| A. | 0.20 to 0.40% |
| B. | 0.35 to 0.45% |
| C. | 0.40 to 0.60% |
| D. | none of these |
| Answer» C. 0.40 to 0.60% | |
| 114. |
Two closely coiled helical springs with stiffnesses k1 and k2 respectively are connected in series. The stiffness of an equivalent spring is given by |
| A. | k₁ k₂ / k₁ + k₂ |
| B. | k₁ - k₂ / k₁ + k₂ |
| C. | k₁ + k₂ / k₁ k₂ |
| D. | k₁ - k₂ / k₁ k₂ |
| Answer» B. k₁ - k₂ / k₁ + k₂ | |
| 115. |
The algebraic difference between the actual size and the corresponding basic size is called actual deviation. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 116. |
The rocker arms in internal combustion engines are of first type levers. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 117. |
Which of the following formula is used in designing a connecting rod ? |
| A. | Euler's formula |
| B. | Rankine's formula |
| C. | Johnson's straight line formula |
| D. | Johnson's parabolic formula |
| Answer» C. Johnson's straight line formula | |
| 118. |
The cam follower generally used in automobile engines is |
| A. | knife edge follower |
| B. | flat faced follower |
| C. | spherical faced follower |
| D. | roller follower |
| Answer» D. roller follower | |
| 119. |
A material is stressed within elastic limit and its linear strain is double as compared to lateral strain. The ratio of its Bulk modulus to Young's modulus will be equal to one. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 120. |
According to law of gearing, the common normal at the point of contact between a pair of teeth must always pass through the pitch point. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 121. |
A bolt has |
| A. | threads for the nut at one end and head at the other end |
| B. | head at one end and the other end fits into a tapped hole of one of the parts to be fastened |
| C. | threads at both ends |
| D. | pointed threads |
| Answer» B. head at one end and the other end fits into a tapped hole of one of the parts to be fastened | |
| 122. |
The eye bolts are used for |
| A. | transmission of power |
| B. | locking devices |
| C. | lifting and transporting heavy machines |
| D. | absorbing shocks and vibrations |
| Answer» D. absorbing shocks and vibrations | |
| 123. |
The bell crank levers used in railway signalling arrangement are of third type levers. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 124. |
A key is normally made from a cold rolled mild steel bars. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 125. |
The thickness of key is usually taken equal to one-sixth of diameter of shaft. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 126. |
Which of the following coupling is used to connect two shafts which have both lateral and angular misalignment ? |
| A. | Bushed pin type coupling |
| B. | Universal coupling |
| C. | Oldham coupling |
| D. | all of these |
| Answer» E. | |
| 127. |
When a hole of diameter 'd' is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate) |
| A. | d.t.τu |
| B. | πd.t.τu |
| C. | x d2τu |
| D. | x d2 x tτu |
| Answer» C. x d2τu | |
| 128. |
Lewis form factor for the 20° full depth involute system is equal to 0.154 - 0.841/T. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 129. |
Which of following statement is correct, for the two shafts connected in parallel? |
| A. | Torque in each shaft is the same |
| B. | Shear stress in each shaft is the same |
| C. | Angle of twist of each shaft is the same |
| D. | Torsional stiffness of each shaft is the same |
| Answer» D. Torsional stiffness of each shaft is the same | |
| 130. |
Power screws are used to convert rotary motion into translatory motion. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 131. |
For low and moderate speed engines, the cam follower should move with |
| A. | uniform velocity |
| B. | simple harmonic motion |
| C. | uniform accleration and retardation |
| D. | cycloidal motion |
| Answer» C. uniform accleration and retardation | |
| 132. |
When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent bending moment is equal to |
| A. | (1/2) × √(M² + T²) |
| B. | √(M² + T²) |
| C. | (1/2) × [M + √(M² + T²)] |
| D. | M + √(M² + T²) |
| Answer» C. (1/2) × [M + √(M² + T²)] | |
| 133. |
The property of a material which enables it to resist fracture due to high impact loads, is called toughness. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 134. |
The buttress threads have low frictional resistance characteristic of the square threads and have the same strength of V-threads. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 135. |
The modulus of elasticity for mild steel is approximately equal to |
| A. | 80 kN/mm² |
| B. | 100 kN/mm² |
| C. | 110 kN/mm² |
| D. | 210 kN/mm² |
| Answer» E. | |
| 136. |
When the lubricant is forced between the journal and the bearing by external pressure, the bearing is called hydrostatic lubricated bearing. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 137. |
In a nut and bolt, the diameter at which the ridges on the bolt are in complete touch with the ridges of the corresponding nut, is called pitch diameter. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 138. |
When carbon in the cast iron is in the form of cementite, the cast iron will be of white colour. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 139. |
For a bevel gear having the pitch angle θ , the ratio of formative number of teeth (TE) to actual number of teeth (T) is |
| A. | 1/sin θ |
| B. | 1/cos θ |
| C. | 1/tan θ |
| D. | sin θ cos θ |
| Answer» C. 1/tan θ | |
| 140. |
The cap screws are |
| A. | slotted for a screw driver and are generally used with a nut |
| B. | similar to tap bolts except that they are of small size and a variety of shapes of heads are available |
| C. | used to prevent relative motion between the two parts |
| D. | none of the above |
| Answer» C. used to prevent relative motion between the two parts | |
| 141. |
The V-belt is used to transmit great amount of power and when the two pulleys are very near to each other. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 142. |
A steel containing upto 0.15% carbon is known as |
| A. | mild steel |
| B. | dead mild steel |
| C. | medium carbon steel |
| D. | high carbon steel |
| Answer» C. medium carbon steel | |
| 143. |
The transverse fillet welded joints are designed for |
| A. | tensile strength |
| B. | compressive strength |
| C. | bending strength |
| D. | shear strength |
| Answer» B. compressive strength | |
| 144. |
According to Clavarino's equation, the thickness of a cylinder is equal to (where d = Inner diameter of cylinder, p = Internal pressure, and μ = Poisson's ratio. ) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 145. |
According to Lame's equation, the thickness of a cylinder is equal to (where d = Inner diameter of cylinder, p = Internal pressure, and μ = Poisson's ratio. ) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 146. |
When an open coiled helical compression spring is subjected to an axial load (W), the compression produced in the spring will be (where n = No. of active turns of the spring, and G = Modulus of rigidity for the spring material) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 147. |
Which of the following statement is wrong for a connecting rod ? |
| A. | The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy |
| B. | If Ixx > 4Iyy., the buckling will occur about Y-axis |
| C. | If Ixx < 4Iyy., the buckling will occur about X-axis |
| D. | The most suitable section for the connecting rod is T-section |
| Answer» E. | |
| 148. |
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the pitch curve. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 149. |
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt, is the tensile stress for the shell material, then thickness of shell is equal to |
| A. | pd/σt |
| B. | pd/2σt |
| C. | pd/3σt |
| D. | pd/4σt |
| Answer» E. | |
| 150. |
A machine part subjected to __________ is called a strut. |
| A. | an axial tensile force |
| B. | an axial compressive force |
| C. | a tangential force |
| D. | any one of these |
| Answer» C. a tangential force | |