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Mechanical drive

Total questions: 20

Worksheet time: 28mins

Name
Class
Date
1.

the drive system shown in the figure is

a)

belt drive

b)

chain drive

c)

gear drive

d)

sprocket drive

2.

the instrument shown is :

a)

Dial Indicator

b)

adjustable mounting brackets

c)

Magnetic Base

d)

Knobs

3.

foundation is the structure that supports machine and designed to perform the function of

a)

Support the load of the machine without settling

b)

Maintain the alignment between coupled components

c)

Absorb any vibrations

d)

all of the above

4.

lock washer makes sure that

a)

the nut does not come loose

b)

the bolt will not pull through the mounting hole.

c)

flat washer will not damage the bedplate

d)

the bolt is strong enough

5.

which of the following classes of bolt has a larger value of strength

a)

8.8

b)

10.9

c)

12.9

d)

6.6

6.

the least important features considered when selecting a fastener is

a)

Length

b)

Diameters

c)

Class

d)

washer thickness

7.

Select the fastener size and type for mounting an electric motor in the following application:

Application: Air compressor drive

Duty: medium

Mounting hole size: 24 mm

Flat Washer Thickness: 3 mm

Lock Washer Thickness: 4 mm

Nut Thickness: 16 mm

a)

M10.8 , 22 mm

b)

M10.8 19 mm

c)

M10.8 20

d)

M10.8 24 mm

8.

calculate the fastener length for mounting an electric motor in the following application.

Application: Air compressor drive

Duty: medium

Mounting hole size: 24 mm

Flat Washer Thickness: 3 mm

Lock Washer Thickness: 4 mm

Nut Thickness: 16 mm

a)

106 mm

b)

160 mm

c)

98

d)

102

9.

An uneven mounting surface while mounting the motor will case :

a)

Soft foot

b)

Shaft run-out

c)

Shaft end float

d)

motor warping

10.

calculate the shaft run-out value if the total indicator reading (TIR) equal = 0.06 mm

a)

0.06 mm

b)

0.03 mm

c)

0.01 mm

d)

0.12 mm

11.

if the motor shaft is bent, this usually due to

a)

high run-out

b)

high end-float

c)

high soft foot

d)

high rotating speed

12.

Instruments that measure motor speed are called

a)

tachometers

b)

dynamo-meters

c)

Transducers

d)

prony brake

13.

if we have a machine with shaft of 15 mm which must be connected to a gear using key fastener, specify the best key type needed for this connection.

a)

Square key

b)

Rectangular Key

c)

Gib head Key

d)

Woodruff Key

14.

for key and key-seat specifying issues as the application load increased then the tolerances must be

a)

tighter tolerances

b)

higher tolerances

c)

tolerances are fixed regardless of the load

d)

there is no effect

15.

select the best material of the key fastener for the following application

Given Information:

1.Application: Shaft to coupling connection for a hydraulic system

2.Shaft diameter: 12 mm

3.Shaft keyseat length: 38 mm

a)

High carbon steel

b)

Zinc-Plated cold rolled steel

c)

Brass

d)

Cold rolled steel

16.

Width and Height of key-seat are measured using

a)

a Vernier caliper.

b)

a micrometer

c)

a rule

d)

a tap measure

17.

the head of the set-screw shown is

a)

oval set screw

b)

flat point set screw

c)

dog point set screw

d)

soft tipped set screw

18.

the shown devise is called

a)

prony brake

b)

dynamo-meter

c)

Transducer

d)

Mechanical Drive System

19.

Calculate the power delivered by a belt drive system shown

a)

7500 watt

b)

7.5 watt

c)

750 Kwatt

d)

0.75 kwatt

20.

Calculate the maximum torque that can be generated by a motor given the following information.

Speed = 1140 RPM

Pout = 250 W

a)

2.1 N.M

b)

21 N.M

c)

0.21 N.M

d)

2.5 N.M