Practice Test: Question Set - 05
1. As the load is increased the speed of D.C. shunt motor will
- (A) Reduce slightly
- (B) Increase slightly
- (C) Increase proportionately
- (D) Remains unchanged
2. At the instant of starting when a D.C. motor is put on supply, it behaves like
- (A) A highly resistive circuit
- (B) A low resistance circuit
- (C) A capacitive circuit
- (D) None of the above
3. Ward-Leonard control is basically a
- (A) Voltage control method
- (B) Field diverter method
- (C) Field control method
- (D) Armature resistance control method
4. Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator?
- (A) Providing laminations in armature core
- (B) Providing laminations in stator
- (C) Using nonmagnetic material for frame
- (D) Using material of low hysteresis coefficient for
armature core material
5. Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity?
- (A) Swinburne's test
- (B) Hopkinson's test
- (C) Field test
- (D) Brake test
6. Which D.C. motor has got maximum self relieving property?
- (A) Series motor
- (B) Shunt motor
- (C) Cumulatively compounded motor
- (D) Differentially compounded motor
7. If a D.C. motor is to be selected for conveyors, which rioter would be preferred?
- (A) Series motor
- (B) Shunt motor
- (C) Differentially compound motor
- (D) Cumulative compound motor
8. To get the speed of D.C, motor below the normal without wastage of electrical energy is used.
- (A) Ward Leonard control
- (B) Rheostat control
- (C) Any of the above method
- (D) None of the above method
9. In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be
- (A) 100%
- (B) Around 90%
- (C) Anywhere between 75% and 90%
- (D) Less than 50%
10. The power mentioned on the name plate of an electric motor indicates
- (A) The power drawn in kW
- (B) The power drawn in kVA
- (C) The gross power
- (D) The output power available at the shaft