OBJECTIVE TYPE QUESTIONS 1. The velocity ratio of two pulleys connected by an open belt or crossed belt is 2. (a) directly proportional to their diameters (b) inversely proportional to their diameters (c) directly proportional to the square of their diameters (d) inversely proportional to the square of their diameters Two pulleys of diameters d, and d, and at distance x apart are connected by means of an open belt drive. The length of the belt is (a)(d+d₁)+2x+ (d₁+d₂)² 4x (b)(d₁-d₂)+2x+ (d₁-d₂)² 4x (c)(d₁+d₂)+ +2x+ (d₁-d₂)² 4x (d)(d-d₂)+2x+ (d₁ +d₂)² 4x 3. In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then (a) open belt drive is recommended (b) cross belt drive is recommended (c) both open belt drive and cross belt drive are recommended (d) the drive is recommended depending upon the torque transmitted Due to slip of the belt, the velocity ratio of the belt drive 4. (a) decreases 5. (b) increases (c) does not change When two pulleys of different diameters are connected by means of an open belt drive, then the angle of contact taken into consideration should be of the (a) larger pulley (b) smaller pulley (c) average of two pulleys The power transmitted by a belt is maximum when the maximum tension in the belt (7) is equal 6. to (a) Ic 7. (b) 2Tc (c)3Tc where Te Centrifugal tension. The velocity of the belt for maximum power is (a). 3m where (d) 4Ic I I (b) (c) (d) 4m 5m 6m m Mass of the belt in kg per metre length.
OBJECTIVE TYPE QUESTIONS 1. The velocity ratio of two pulleys connected by an open belt or crossed belt is 2. (a) directly proportional to their diameters (b) inversely proportional to their diameters (c) directly proportional to the square of their diameters (d) inversely proportional to the square of their diameters Two pulleys of diameters d, and d, and at distance x apart are connected by means of an open belt drive. The length of the belt is (a)(d+d₁)+2x+ (d₁+d₂)² 4x (b)(d₁-d₂)+2x+ (d₁-d₂)² 4x (c)(d₁+d₂)+ +2x+ (d₁-d₂)² 4x (d)(d-d₂)+2x+ (d₁ +d₂)² 4x 3. In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then (a) open belt drive is recommended (b) cross belt drive is recommended (c) both open belt drive and cross belt drive are recommended (d) the drive is recommended depending upon the torque transmitted Due to slip of the belt, the velocity ratio of the belt drive 4. (a) decreases 5. (b) increases (c) does not change When two pulleys of different diameters are connected by means of an open belt drive, then the angle of contact taken into consideration should be of the (a) larger pulley (b) smaller pulley (c) average of two pulleys The power transmitted by a belt is maximum when the maximum tension in the belt (7) is equal 6. to (a) Ic 7. (b) 2Tc (c)3Tc where Te Centrifugal tension. The velocity of the belt for maximum power is (a). 3m where (d) 4Ic I I (b) (c) (d) 4m 5m 6m m Mass of the belt in kg per metre length.
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter16: Advanced Automatic Controls-direct Digital Controls (ddcs) And Pneumatics
Section: Chapter Questions
Problem 4RQ: A control loop contains _______, _______, and _________.
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Transcribed Image Text:OBJECTIVE TYPE QUESTIONS
1.
The velocity ratio of two pulleys connected by an open belt or crossed belt is
2.
(a) directly proportional to their diameters
(b) inversely proportional to their diameters
(c) directly proportional to the square of their diameters
(d) inversely proportional to the square of their diameters
Two pulleys of diameters d, and d, and at distance x apart are connected by means of an open belt
drive. The length of the belt is
(a)(d+d₁)+2x+
(d₁+d₂)²
4x
(b)(d₁-d₂)+2x+
(d₁-d₂)²
4x
(c)(d₁+d₂)+ +2x+
(d₁-d₂)²
4x
(d)(d-d₂)+2x+
(d₁ +d₂)²
4x
3.
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then
(a) open belt drive is recommended
(b) cross belt drive is recommended
(c) both open belt drive and cross belt drive are recommended
(d) the drive is recommended depending upon the torque transmitted
Due to slip of the belt, the velocity ratio of the belt drive
4.
(a) decreases
5.
(b) increases
(c) does not change
When two pulleys of different diameters are connected by means of an open belt drive, then the angle
of contact taken into consideration should be of the
(a) larger pulley (b) smaller pulley (c) average of two pulleys
The power transmitted by a belt is maximum when the maximum tension in the belt (7) is equal
6.
to
(a) Ic
7.
(b) 2Tc
(c)3Tc
where Te Centrifugal tension.
The velocity of the belt for maximum power is
(a).
3m
where
(d) 4Ic
I
I
(b)
(c)
(d)
4m
5m
6m
m Mass of the belt in kg per metre length.
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