In jaw crushers a motor has to often start against ____________________ load?

Related Mcqs:

1. For which of the following applications motor has to start with high acceleration ?

   A. Oil expeller
   B. Floor mill
   C. Lifts and hoists
   D. Centrifugal pump

2. When the load is above _______________ a synchronous motor is found to be more economical?

   A. 2 kW
   B. 20 kW
   C. 50 kW
   D. 100 kW

3. The load cycle for a motor driving a power press will be________________?

   A. variable load
   B. continuous
   C. continuous but periodical
   D. intermittent and variable load

4. In which of the following applications the load on motor changes in cyclic order ?

   A. Electric shovels
   B. Cranes
   C. Rolling mills
   D. All of the above

5. ________________ motor is a constant speed motor?

   A. Synchronous motor
   B. Schrage motor
   C. Induction motor
   D. Universal motor

6. 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

7. A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?

   A. 5 kO
   B. 20 kO
   C. 100 kO
   D. 10 kO

8. In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?

   A. RC + RL
   B. RC || RL
   C. RL
   D. RC

9. If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is____________________?

   A. RL + RC
   B. RC || RL
   C. RL – RC
   D. RC

10. The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?

    A. The same as
    B. Less than
    C. More than
    D. None of the above