Regulation of speed and feed rates - Mechanical Engineering (MCQ) questions and answers

1)   Which of the following statements is true for stepless regulation of speed and feed rate?

1. Stepless regulation has noisy operation
2. Stepless regulation is compact
3. Less costly than stepped regulation system
4. Speed can only be adjusted only after stopping the machine

a. Statement 1, 2 and 3
b. Only statement 2
c. Only statement 4
d. All the statements are true
Answer  Explanation 

ANSWER: Only statement 2

Explanation:
No explanation is available for this question!
2)   What are variators?

a. They are electrical stepped regulation devices
b. They are mechanical stepped regulation devices
c. They are mechanical stepless regulation devices
d. They are electrical stepless regulation devices
Answer  Explanation 

ANSWER: They are mechanical stepless regulation devices

Explanation:
No explanation is available for this question!
3)   Why is a dog clutch used?

a. Used to connect and disconnect machine parts
b. Used to control torque
c. It helps in rotating the shafts at different speeds
d. All of the above
Answer  Explanation 

ANSWER: Used to connect and disconnect machine parts

Explanation:
No explanation is available for this question!
4)   The chain used in positively infinitely variable drive provides

a. friction type drive
b. positive drive
c. Both a. and b.
d. None of the above
Answer  Explanation 

ANSWER: Both a. and b.

Explanation:
No explanation is available for this question!
5)   Which belt is a combination of both toothed and belt transmissions used as an intermediate member in variators with axially displaceable cones?

a. Cogged belt
b. V belt
c. Both a. and b.
d. None of the above
Answer  Explanation 

ANSWER: Cogged belt

Explanation:
No explanation is available for this question!
6)   Which type of variator is known as Svetozaro variator?

a. Cone variator with swiveling disc
b. Cone variator with spheres supported on shafts
c. Spheroid with spheres supported on shafts
d. Spheroid with swiveling disc
Answer  Explanation 

ANSWER: Spheroid with swiveling disc

Explanation:
No explanation is available for this question!
7)   What is the difference between cone variators and face plate variators?

a. Velocity distribution over contact area for cone variators is better than face plate variators
b. Velocity distribution over contact area for face plate variators is better than cone variators
c. Cone and face plate variators have different speed variation range
d. None of the above
Answer  Explanation 

ANSWER: Velocity distribution over contact area for cone variators is better than face plate variators

Explanation:
No explanation is available for this question!
8)   Which gearboxes provide an arithmetic series of feed steps suitable for cutting threads?  

a. Epicyclic gear box
b. Differential gear box
c. Norton gear box
d. None of the above
Answer  Explanation 

ANSWER: Norton gear box

Explanation:
No explanation is available for this question!
9)   Which formula is used to calculate extreme spindle speed (nmax) of a machine tool gearbox?

a. 1000 Vmax / pdmax
b. 1000 Vmax / pdmin
c. 60 Vmax / pdmin
d. 60 Vmax / pdmax
Answer  Explanation 

ANSWER: 1000 Vmax / pdmin

Explanation:
No explanation is available for this question!
10)   Motion in stepped regulation method is obtained by

a. electrical systems
b. belt drive
c. hydraulic systems
d. All of the above
Answer  Explanation 

ANSWER: belt drive

Explanation:
No explanation is available for this question!

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