Which of the following option is true about rotary tables? Statement 1: Index is not used with optical rotary table. Statement 2: Accurate worm and gear rotary table can be used with an index plate.

Speed reduction in a gear box is achieved using a worm and worm wheel. The worm wheel has 30 teeth and a pitch diameter of 210 mm. If the pressure angle of the worm is 20o, what is the axial pitch of the worm?

A

7 mm

B

22 mm

C

14 mm

D

63 mm

A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. Calculate the torque on the gear C if number of teeth on gear A, B and C are 40, 70 and 30.

A

66N-m

B

68N-m

C

53N-m

D

45N-m

Ranjan purchased 120 tables at a price of Rs. 110 per table. He sold 30 tables at a profit of Rs. 12 per table and 75 tables at a profit of Rs. 14 per table. The remaining tables were sold at a loss of Rs. 7 per table. What is the average profit per table ?

A

Rs. 10.04

B

Rs. 10.875

C

Rs. 12.80

D

Rs. 12.875

Which of the following is true for accurate worm and gear rotary tables?

A

Bidirectional approach is used for setting

B

Can be used for inspection of angles

C

Can’t be used for generation of angles

D

Worm and gear are highly accurate

The 2018 Nobel Prize in Physics has been awarded in laser physics for the optical tweezers and their applications to biological systems for the method of generating high-intensity, ultra-short optical pulses. Which of the following verifies the given statement? I: The 2018 Nobel Prize in Physics has been awarded in laser physics for the optical tweezers. II: The 2018 Nobel Prize in Physics has been awarded for applications of the optical tweezers to biological systems. III: The 2018 Nobel Prize in Physics has been awarded for the method of generating high-intensity, ultra-short optical pulses using the optical tweezers.

A

Only I

B

Only II and III

C

Only I and II

D

Only I and III

E

All of these

A planetary gear train is shown in the figure. Number of teeth on the sun gear A, planet gear B and fixed ring gear D are given by 30, 70 and 140 respectively. Module is taken as 5mm. A pair of spur gears consist of 25 teeth pinion meshing with a 115 teeth gear. The module is 5mm. Calculate the gear ratio.

A

5

B

4.6

C

5.2

D

4

Following is the data for transmission system of a Gear box reduction ratios.
1^st gear - 4.3 : 1
2^nd gear - 3.00 : 1
3^rd gear - 2.71 : 1
4^th gear - 1 : 1
Final drive reduction is 5.0 : 1
The overall reduction when the vehicle is driven in 2^nd gear is

A

3.00 : 1

B

13.55 : 1

C

5 : 1

D

15 : 1

Rinki has three plates of Jalebies: Plate A, Plate B and Plate C. Plate A has only one Jalebi, Plate B has five Jalebies and Plate C has three Jalebies. She wants to put equal numbers of Jalebies in all the plates. Which of the following statement is true?

A

Take two Jalebies from Plate B and put in Plate A

B

Take one Jalebi from Plate B and one from Plate C and put both in plate A

C

All three plates cannot have equal number of Jalebies

D

Take one Jalebi from Plate A and put in Plate C so that Plate B and Plate C have equal number of Jalebies.

What is worm lead in worm and worm gear?

A

Nw x 2px

B

Nw x 4px

C

Nw x px

D

Nw / px

What is the effect of lack of true spindle rotation in accurate worm and gear rotary table?

A

Angular error

B

Centre distance error

C

Both angular and centre distance error

D

Decrease repeatability

Which of the following option is true about rotary tables? Statement 1: Index is not used with optical rotary table. Statement 2: Accurate worm and gear rotary table can be used with an index plate.

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