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
Next Tests: