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EMD UNIT-2 mcq Quiz

Total questions: 36

Worksheet time: 18mins

Name
Class
Date
1.

Shafts are generally available up to _____ metres length.

a)

5

b)

6

c)

7

d)

8

2.

_____ are used to connect two or more shafts together.

a)

Bolts

b)

Keys

c)

Couplings

d)

Pins

3.

Rigid flange couplings consist of _____ flanges.

a)

One

b)

Two

c)

Three

d)

Four

4.

The reason for providing a projection in one flange and corresponding recess in the other flange is for _____.

a)

Decoration

b)

Cost reduction

c)

Easy removal

d)

Perfect alignment of the shafts

5.

The bolts and nuts are projecting outside in _____ coupling.

a)

Protected type flange

b)

Marine type flange

c)

Flexible pin type

d)

Unprotected type flange

6.

The projecting bolts and nuts are protected by flanges in ______ coupling.

a)

Unprotected type flange

b)

Flexible type

c)

Marine coupling

d)

Protected type flange

7.

In _____ coupling, the flanges are forged integral with the shafts.

a)

Flexible

b)

Marine type flange

c)

Protected flange

d)

Split muff

8.

In marine type flange coupling, the flanges are held together by means of _____.

a)

Welds

b)

Tapered headless bolts

c)

Nuts and bolts

d)

Keys

9.

The couplings used to connect shafts with small axial or angular misalignment is _____.

a)

Rigid flange coupling

b)

Split muff coupling

c)

Bushed pin type flexible couplings

d)

Marine coupling

10.

In bushed pin type flexible couplings, the coupling bolts are known as _____.

a)

Bolts

b)

Nuts

c)

Keys

d)

Pins

11.

A key is a _____.

a)

Bolt for coupling

b)

Piece of mild steel inserted between shaft and hub

c)

Nut for gear

d)

Locking device

12.

The key is always inserted _____ to the axis of the shaft.

a)

Perpendicular

b)

Inclined

c)

Parallel

d)

Twisted

13.

Keys are subjected to _____ stresses.

a)

Tensile

b)

Shear and bending

c)

Crushing and shearing

d)

Torsional

14.

A slot or recess in a shaft and hub of the pulley to accommodate a key is known as _____.

a)

Keyslot

b)

Keyhole

c)

Keyway

d)

Keyring

15.

The different types of keys are _____.

a)

Sunk keys, taper keys, round keys and clamp keys

b)

Sunk keys, saddle keys, tangent keys and round keys

c)

Saddle keys, flat keys, tangent keys and pin keys

d)

Sunk keys, feather keys, hook keys and parallel keys

16.

_____ are provided half in the keyway of the shaft and half in the keyway of the hub or boss of the pulley.

a)

Saddle keys

b)

Tangent keys

c)

Sunk keys

d)

Feather keys

17.

The usual proportions of rectangular sunk key are _____.

a)

Width = d/4 ; Thickness = d/6

b)

Width = d/6 ; Thickness = d/4

c)

Width = d/3 ; Thickness = d/5

d)

Width = d/5 ; Thickness = d/3

18.

Say true or false. Parallel keys are tapered keys.

a)

True

b)

False

19.

The key used where the pulley, gear or other mating piece is required to slide along the shaft is _____.

a)

Tangent key

b)

Woodruff key

c)

Saddle key

d)

Parallel key

20.

The purpose of providing gib head in key is _____.

a)

To prevent slipping

b)

To increase torque

c)

To remove the key easily

d)

To avoid rotation

21.

The key that permits relative axial movement is known as _____.

a)

Saddle key

b)

Tangent key

c)

Feather key

d)

Woodruff key

22.

Woodruff key has the shape of _____.

a)

A full circle

b)

A segment of a circular disc

c)

A square block

d)

A rectangular plate

23.

_____ key fits only in the key way in the hub.

a)

Tangent key

b)

Feather key

c)

Saddle key

d)

Sunk key

24.

The two types of saddle keys are _____.

a)

Tapered and flat

b)

Feather and flat

c)

Flat saddle key and hollow saddle key

d)

Hollow saddle key and sunk key

25.

Say true or false: A flat saddle key is a taper key.

a)

True

b)

False

26.

Saddle keys are used for _____ loads.

a)

Heavy

b)

Shock

c)

Medium

d)

Light

27.

The bottom of the hollow saddle key is shaped _____.

a)

Flat

b)

Angled

c)

To fit the curved surface of the shaft

d)

Pointed

28.

Hollow saddle keys hold on by _____.

a)

Tension

b)

Compression

c)

Friction

d)

Interlocking

29.

Tangent keys are also known as _____.

a)

Round keys

b)

Kennedy keys

c)

Woodruff keys

d)

Gib head keys

30.

Tangent keys consist of _____.

a)

Two circular keys fitted vertically

b)

Two square keys fitted in pair at right angles

c)

One rectangular and one square key

d)

Two tapered flat keys

31.

The tangent keys are used in _____.

a)

Light duty shafts

b)

Small engines

c)

Large heavy duty shafts

d)

Rotors

32.

The round keys are _____ in cross section.

a)

Square

b)

Circular

c)

Tapered

d)

Flat

33.

Round keys fit into holes drilled _____.

a)

Completely in the hub

b)

Only in the shaft

c)

Partly in the shaft and partly in the hub

d)

On both ends

34.

When a key is used for transmitting torque from a shaft to a hub, it may fail due to _____.

a)

Bending stress

b)

Torsion

c)

Shearing stress or compressive stress

d)

Tensile stress

35.

The keyway cut into the shaft _____ the load carrying capacity of the shaft.

a)

Increases

b)

Maintains

c)

Reduces

d)

Does not affect

36.

The ratio between strength of shaft with keyway to the strength of shaft without keyway is known as _____.

a)

Key strength

b)

Stress factor

c)

Torque ratio

d)

Shaft strength factor

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