51. The travelling speed of cranes varies from
(a) 20 to 30 m/s
(b) 10 to 15 m/s
(c) 5 to 10 m/s
(d) 1 to 2.5 m/s
Ans: d
52. Besides a constant speed a synchronous rotor possesses which of the following advantages ?
(a) Lower cost
(b) Better efficiency
(c) High power factor
(d) All of the above
Ans: c
53. By the use of which of the followingm D.C. can be obtained from AC. ?
(a) Silicon diodes
(b) Mercury arc rectifier
(c) Motor generator set
(d) Any of the above
Ans: d
54. Which of the following motors is preferred when quick speed reversal is the main consideration ?
(a) Squirrel cage induction motor
(b) Wound rotor induction motor
(e) Synchronous motor
(d) D.C. motor
Ans: d
55. Which ofthefollowing motors is preferred when smooth and precise speed control over a wide range is desired ?
(a) D.C. motor
(b) Squirrel cage induction motor
(c) Wound rotor induction motor
(d) Synchronous motor
Ans: a
56. For crane travel which of the following motors is normally used ?
(a) Synchronous motor
(b) D.C. differentially compound motor
(c) Ward-Leonard controlled D.C. shunt motor
(d) AC. slip ring motor
Ans: d
57. The capacity of a crane is expressed in terms of
(a) type of drive
(b) span
(c) tonnes
(d) any of the above
Ans: c
58. The characteristics of drive for crane hoisting and lowering are which of the following ?
(a) Precise control
(b) Smooth movement
(c) Fast speed control
(d) All of the above
Ans: d
59. Which of the following motors is preferred for boom hoist of a travelling crane ?
(a) Single phase motor
(b) Synchronous motor
(c) A.C. slip ring motor
(d) Ward-Leonard controlled D.C. shunt motor
Ans: c
60. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
(a) slop speed operation
(b) high starting torque
(c) low windage losses
(d) all of the above
Ans: b
Read More Questions:
Industrial Drives MCQs Part1
Industrial Drives MCQs Part2
(a) 20 to 30 m/s
(b) 10 to 15 m/s
(c) 5 to 10 m/s
(d) 1 to 2.5 m/s
Ans: d
52. Besides a constant speed a synchronous rotor possesses which of the following advantages ?
(a) Lower cost
(b) Better efficiency
(c) High power factor
(d) All of the above
Ans: c
53. By the use of which of the followingm D.C. can be obtained from AC. ?
(a) Silicon diodes
(b) Mercury arc rectifier
(c) Motor generator set
(d) Any of the above
Ans: d
54. Which of the following motors is preferred when quick speed reversal is the main consideration ?
(a) Squirrel cage induction motor
(b) Wound rotor induction motor
(e) Synchronous motor
(d) D.C. motor
Ans: d
55. Which ofthefollowing motors is preferred when smooth and precise speed control over a wide range is desired ?
(a) D.C. motor
(b) Squirrel cage induction motor
(c) Wound rotor induction motor
(d) Synchronous motor
Ans: a
56. For crane travel which of the following motors is normally used ?
(a) Synchronous motor
(b) D.C. differentially compound motor
(c) Ward-Leonard controlled D.C. shunt motor
(d) AC. slip ring motor
Ans: d
57. The capacity of a crane is expressed in terms of
(a) type of drive
(b) span
(c) tonnes
(d) any of the above
Ans: c
58. The characteristics of drive for crane hoisting and lowering are which of the following ?
(a) Precise control
(b) Smooth movement
(c) Fast speed control
(d) All of the above
Ans: d
59. Which of the following motors is preferred for boom hoist of a travelling crane ?
(a) Single phase motor
(b) Synchronous motor
(c) A.C. slip ring motor
(d) Ward-Leonard controlled D.C. shunt motor
Ans: c
60. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
(a) slop speed operation
(b) high starting torque
(c) low windage losses
(d) all of the above
Ans: b
Read More Questions:
Industrial Drives MCQs Part1
Industrial Drives MCQs Part2
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