MCQ POWER TRANSMISSION BELTS

 

 

https://www.mesubjects.net/wp-admin/post.php?post=4018&action=edit        Flywheel & governor

https://www.mesubjects.net/wp-admin/post.php?post=7427&action=edit        Belt Drive

https://www.mesubjects.net/wp-admin/post.php?post=3982&action=edit      Flat Belt Drive

https://www.mesubjects.net/wp-admin/post.php?post=5328&action=edit    Belt-chain-Gear Drives

https://www.mesubjects.net/wp-admin/post.php?post=6178&action=edit    Q. ANS. Gears

MCQ POWER TRANSMISSION

BELTS

MCQ increases understanding and

level of clarity. Fundamentals are

easily applied in real life applications.

Power transmission is by friction. Belts,

ropes, chains and gear do power

transmission. There is a driver and a

driven. Driver is the pulley or gear

mounted on the motor or engine

shaft. Driven pulley is on the machine

shaft.

 

  1. A belt drive consists of

  1. Two pulleys & two shafts

  2. One shaft &Two pulleys

  3. Two pulleys, two shafts and a belt

  4. None

ANS: (c)

  1. Types of belt drives are

  1. One

  2. Two

  3. Three

  4. None

ANS: (c)

  1. Belt drives are

  1. Open & cross

  2. Cross & compound

  3. Open, cross & compound

  4. None

ANS: (c)

  1. Number of belt shapes is

  1. One

  2. Two

  3. Three

  4. None

ANS: (c)

  1. Shapes of belts are

  1. Flat & Round

  2. Round & V-shape

  3. Flat, V-shape and round

  4. None

ANS: (c)

  1. A compound belt drive has

  1. > two pulleys

  2. = two pulleys

  3. < two pulleys

  4. None

ANS: (a)

  1. In an open belt drive, pulleys rotate in the

  1. Opposite directions

  2. Same direction

  3. Can’t say

  4. None

ANS: (b)

  1. In a cross belt drive, pulleys rotate in the

  1. Opposite directions

  2. Same direction

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. In a compound belt drive, pulleys move in the

  1. Opposite directions

  2. Same direction

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. In a flat belt drive, Velocity ratio is

  1. Firstly      Velocity of driven/Velocity of driver

  2. Secondly  Velocity of driver/Velocity of driven

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. Velocity ratio in a flat belt drive is

  1. Firstly               Speed of driver / Speed of driven

  2. Secondly          Speed of driven / Speed of driver

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. Velocity ratio in a flat belt drive is

  1. =1

  2. < 1

  3. >1

  4. None

ANS: (b)

  1. Given N1,d1 & N2, d2 RPM’s and diameters of driver & driven.  Flat belt thickness ‘t’, velocity ratio is

  1. Firstly          N1/N2 =(d2+t)/(d1+t)

  2. Secondly     N2/N1 =(d2+t)/(d1+t)

  3. Thirdly         N2/N1 =(d1+t)/(d2+t)

  4. None

ANS: (c)

  1. Slip in a belt occurs when the frictional grip between the belt and pulley is

  1. Sufficient

  2. Insufficient

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. With slip in belt, driver pulley moves forward

  1. With belt

  2. Without belt

  3. With or without belt

  4. None

ANS: (b)

  1. With slip in driver pulley of a flat belt drive, velocity of the belt over driver pulley

  1. Decreases

  2. Increases

  3. Remains same

  4. None

ANS: (a)

  1. Velocity of belt with slip S1 in driver pulley is

  1. Firstly      (πN1d1/60)(1+S1/100)

  2. Secondly  (πN1d1/60)(1-S1/100)

  3. Thirdly     (πN1d1/60)(S1/100)

  4. None

ANS: (b)

  1. Given S1 & S2 slips in driver & driven pulleys. Velocity of belt on driven pulley becomes

    1. Firstly (πN1d1/60)(1+S1/100) (S2/100)

    2. Secondly (πN1d1/60)(1+S1/100)(1+S2/100)

    3. Thirdly (πN1d1/60)(1-S1/100)(1-S2/100)

    4. None

ANS: (c)

  1. Length of flat belt drive with center distance ‘C’ is

  1. Firstly          π(r1+r2) +2C+(1/C) (r12+r22)

  2. Secondly     π(r1+r2) +2C+(1/C) (r12–r22)

  3. Thirdly         π(r1+r2) +2C+(1/C) (r1–r2)2

  4. None

ANS: (c)

  1. Length of a cross belt drive with center distance ‘C’ is

  1. Firstly          π(r1+r2) +2C+(1/C) (r12+r22)

  2. Secondly     π(r1+r2) +2C+(1/C) (r12–r22)

  3. Thirdly        π(r1+r2) +2C+(1/C) (r1+r2)2

  4. None

ANS: (c)

  1.  T1 & T2 are tight and loose side belt tensions. The ratio of belt tensions with coefficient of friction µ and angle of contact ‘θ’ is

    1. Firstly        T1/T2 = e–µθ

    2. Secondly    T1/T2 = e1–µθ

    3. Thirdly        T1/T2 = eµθ

    4. None

ANS” (c)

  1. Power transmitted by a belt drive is

  1. Firstly        (T1—T2) x V Watt

  2. Secondly   (T1+T2) x V Watt

  3. Thirdly       (T1—T2) x V2 Watt

  4. None

ANS: (a)

  1. Centrifugal tension’ Tc’ with ‘w’ weight per unit length of belt is

  1. Firstly Tc =wV2

  2. Secondly Tc =wV

  3. Thirdly Tc=wV2/g

  4. None

ANS: (c)

  1. Maximum tension ‘ Tmax ‘ in the belt is

  1. Firstly Tmax  =T1+T2+Tc

  2. Secondly Tmax =T1—T2 + Tc

  3. Thirdly Tmax =T1 + Tc

  4. None

ANS: (c)

  1. Maximum power transmitted by a belt with Tmax Is

  1. Firstly Maximum H.P.=(2/3) Tmax(1–eµθ) (gTmax / 4w)5

  2. Secondly Maximum H.P.=(2/3) Tmax(1-e–µθ) (gTmax /3w)5

  3. Thirdly Maximum H.P.=(2/3) Tmax(1–eµθ) (gTmax /3w)5

  4. None

ANS: (b)

  1. Initial tension ‘Ti ‘ in the belt is

  1. Firstly Ti = (T1+T2+Tc)/2

  2. Secondly Ti = (T1+T2)/2+Tc

  3. Thirdly Ti = (T1+T2)/3+Tc

  4. None

ANS: (b)

  1. With groove angle ‘α’ for a rope, the ratio of belt tensions becomes

  1. Firstly T1/T2 =eµθ Sin α

  2. Secondly T1/T2 =eµθ Cosec α

  3. Thirdly T1/T2 =eµθ Cos α

  4. None

ANS: (b)

  1. Various commonly used belt materials are

  1. Leather & Fiber

  2. Cotton & rubber

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. Belt drive is for

  1. Less power transmission

  2. High power transmission

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. Belts require

  1. Short center distance

  2. Large center distance

  3. With both (a) & (b)

  4. None

ANS: (b)

  1. Service life of a belt drive is

  1. Less

  2. More

  3. Medium

  4. None

ANS: (b)

  1. The bearing life in a belt drive is

  1. Less

  2. More

  3. Medium

  4. None

ANS: (a)

  1. Common cross-section of flat belt is

  1. Round

  2. Square

  3. Trapezoidal

  4. None

ANS: (d)

  1. Common cross-section of flat belt is

    1. Rectangular

    2. Square

    3. Trapezoidal

    4. None

ANS: (a)

  1. Common cross-section of V-belt is

  1. Round

  2. Square

  3. Trapezoidal

  4. None

ANS: (c)

  1. Which belt is best for power transmission?

  1. Flat belt

  2. V-belt

  3. Rope

  4. None

ANS: (b)

  1. In which belt, the center distance is less?

  1. Flat belt with flat pulleys

  2. V-belt

  3. Flat belt with crowned pulleys

  4. None

ANS: (b)

  1. In which case, stretch and slip is less?

  1. Flat belt

  2. V-belt

  3. Round belt

  4. None

ANS: (b)

  1. The stepped pulley changes the speed of the

  1. Driver

  2. Driven

  3. Driver & driven

  4. None

ANS: (b)

  1. The fast and loose pulley stops the

  1. Driver pulley without stopping the driven pulley

  2. Driven pulley without stopping the driver pulley

  3. Stopping both driver and driven pulleys

  4. None

ANS: (b)

  1. Centrifugal force increases tension on the

  1. Tight side

  2. Slack side

  3. Both tight and slack sides

  4. None

ANS: (c)

  1. For maximum power transmission, centrifugal tension is

  1. Firstly         Tc =Tmax

  2. Secondly    Tc=Tmax /2

  3. Thirdly        Tc=Tmax / 3

  4. None

ANS: (c)

  1. Velocity of belt for maximum power transmission with mass per unit length ‘m’ is

  1. Firstly          V=(Tmax /2m)5

  2. Secondly      V=(Tmax /3m)5

  3. Thirdly          V=(Tmax /4m)5

  4. None

ANS: (b)

  1. V-belts are available with a

  1. Joint

  2. Without a joint

  3. Both with and without a joint

  4. None

ANS: (b)

  1. Selection of a belt drive depends upon

  1. Center distance & peripheral speed

  2. Velocity ratio & power to be transmitted

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. The tight side tension in a flat belt is on the

  1. Bottom side

  2. Top side

  3. Bottom or top side

  4. None

ANS: (b)

  1. The tight side tension in a V-belt is

  1. Bottom side

  2. Top side

  3. Both top or bottom side

  4. None

ANS: (c)

  1. The center line of a v-belt can be

  1. Horizontal or vertical

  2. Inclined

  3. Horizontal/vertical/inclined

  4. None

ANS: 9c)

  1. A belt is

  1. Rigid

  2. Flexible

  3. Both rigid and flexible

  4. None

ANS: (b)

  1. The allowable stress for leather belt to have long life is

  1. Firstly          1.75 M Pa

  2. Secondly     2.75 M Pa

  3. Thirdly         3.75 M Pa

  4. None

ANS: (a)

  1. The optimum belt velocity is

  1. 10-12 m/s

  2. 20-22 m/s

  3. 30-32 m/s

  4. None

ANS: (b)