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SMU-MINING MACHINERY EXAM 2021

Question Paper & Key of SECOND CLASS UNRESTRICTED UNDER MMR – MINING MACHINERY EXAM-2021
No. of Questions: 100
Duration in Minutes: 120
1)    What is the fullform of TDC in internal combustion engine
A)    Top Drive Centre
B)    Top Driven Centre
C)    none of these
D)    Top Driver Centre
E)    Top Dead Centre
 
2)    Thermal runaway of thyristor occurs
A)    none of these
B)    gate current is high
C)    gate voltage is high
D)    when the load is suddenly withdraw
E)    if the temperature of thyristor is high
 
3)    According to I.S. code in actual design, maximum permissible deflection is limited to      
A)    (span / 200)
B)    (span / 525)
C)    none of these
D)    (span / 60)
E)    (span / 325)

4)    For increasing the voltage rating of the zener diode, they are connected in
A)    Series
B)    none of these
C)    Series-Parallel
D)    Parallel
E)    all of these
 
5)    if an induction motor experiences single phasing while running :
A)    it will draw current at a power factor poorer than rated
B)    it will draw smaller current than generated
C)    it will always stall
D)    it will draw excessive current and get over heated but keep running, provided enough torque is generated to overcome load torque
E)    all of these

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