Industrial Drivers MCQ - Set 03 - ObjectiveBooks

Industrial Drivers MCQ - Set 03

Practice Test: Question Set - 03

1. Ward-Leonard controlled D.C. drives are generally used for _________ excavators.
    (A) Light duty
    (B) Medium duty
    (C) Heavy duty
    (D) All of the above

2. The starting torque of a D.C. motor is independent of which of the following?
    (A) Flux
    (B) Armature current
    (C) Flux and armature current
    (D) Speed

3. __________ method of starting a three phase induction motor needs six terminals.
    (A) Star-delta
    (B) Resistance starting
    (C) Autotransformer
    (D) None of the above

4. Which of the following machines has heavy fluctuation of load?
    (A) Printing machine
    (B) Punching machine
    (C) Planer
    (D) Lathe

5. 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
    (C) Synchronous motor
    (D) D.C. motor

6. For a D.C. shunt motor which of the following is incorrect?
    (A) Unsuitable for heavy duty starting
    (B) Torque varies as armature current
    (C) Torque armature current is a straight line
    (D) Torque is zero for zero armature current

7. 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

8. In ________ the speed can be varied by changing the position of brushes.
    (A) Slip ring motor
    (B) Schrage motor
    (C) Induction motor
    (D) Repulsion motor

9. Which of the following motors is usually preferred for kiln drives?
    (A) Cascade controlled A.C. motor
    (B) Slip ring induction motor
    (C) Three phase shunt wound commutator motor
    (D) Any of the above

10. For which of the following applications D.C. motors are still preferred?
    (A) High efficiency operation
    (B) Reversibility
    (C) Variable speed drive
    (D) High starting torque

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